Ladies and gentlemen, thank you for standing by, and welcome to the Lilly Q4 2020 Earnings Call. At this time, all participants are in a listen only mode. Later, we will conduct a question and answer session. As a reminder, this conference is being recorded. I would now like to turn the conference over to our host, Vice President of Investor Relations, Mr.
Kevin Hearn. Please go ahead, sir.
Good morning. Thank you for joining us for Eli Lilly and Company's Q4 2020 earnings call. I'm Kevin Hearn, Vice President of Investor Relations. Joining me on today's call are Dave Rex, Lilly's Chairman and CEO Josh Smiley, Chief Financial Officer Doctor. Dan Skovronsky, Chief Scientific Officer Ann White, President of Lilly Oncology Ilya Yuffa, President of Lilly Biomedicines And Mike Mason, President of Lilly Diabetes.
We're also joined by Sarah Smith and Lauren Zierke of the Investor Relations team. During this conference call, we anticipate making projections and forward looking statements based on our current expectations. Our actual results filed with the Securities and Exchange Commission. The information we provide about our products and pipeline is for the benefit of the investment community. It is not intended to be promotional and is not sufficient for prescribing decisions.
As we transition to our prepared remarks, A reminder that our commentary will focus on non GAAP financial measures, which exclude the financial contribution from Elanco during 2019 and present earnings per share as though the full disposition via the exchange offer was complete on January 1, 2019. Now I'll turn the call over to Dave for a summary of our 2020 results.
Thanks, Kevin. On our guidance call in December 2019, we provided a framework for how we are thinking about the 2020 to 2025 period, noting our expectations to continue to deliver Top tier revenue growth and operating margin growing into the mid to high 30s, while continuing to increase R and D productivity. As we met with investors throughout 2020, it was evident that while there was good insight into management's expectations for the next few years, Investors were increasingly focused on our ability to grow in the second half of this coming decade. In the past 2 months, we have begun to deliver answers to that question with positive data for Loxo-three zero five, Tirzepatide and dononumab, each with a chance to significantly improve patient outcomes in areas of high unmet medical need. We believe these are 3 of the most important and exciting pipeline assets in our industry and provide meaningful support for Lilly's growth potential beyond 2025.
Together with Verzenio data in early breast cancer last summer, We have significantly reinforced our growth prospects for the midterm and upgraded them for the long term. While these readouts drive incredible momentum for our future, I'm also pleased with the way that we delivered in a complex and challenging 2020. Our 2020 revenue enable us to exceed our mid term revenue goal of 7% CAGR from the years 2015 to 2020. Turning to the quarter, revenue grew an impressive 22% versus Q4 2019 or 20% in constant currency. This strong performance was driven entirely by volume growth of 24 percentage points, despite continued pricing headwinds and demand pressure from the effects of COVID-nineteen.
Excluding vamlanivimab, revenue grew over 7% for the quarter. Key growth products continue to drive this volume and our revenue, now representing 55% of our base business. We continue to advance our productivity agenda in Q4 as the combination of strong revenue growth And modest operating expense growth drove significant margin expansion. Our non GAAP operating margin was approximately 33% with and without COVID-nineteen therapies, an improvement of roughly 6.50 basis points versus Q4 2019. With continued margin expansion for the quarter and full year, excluding the impacts of COVID-nineteen on our business in 2020, We would have achieved our midterm operating margin as a percent of revenue goal of 31%.
We're proud to have delivered nearly 1,000 basis Points of operating margin expansion since 2016. In addition to the strong business performance, We achieved multiple pipeline milestones since our Q3 earnings call. These include the positive results I noted for Loxo-three zero five, Tirzepatide and dononumab, the FDA granting emergency use authorizations for bamlanivimab and baricitinib to help patients with COVID-nineteen. The submission of empagliflozin for heart failure in people with reduced injection fraction in the U. S, Europe and Japan, this is done in collaboration with Boehringer Ingelheim, and the submission of Verzenio in early breast cancer in the U.
S. During Q4, we put our growing operating cash flow to work, announcing a 5% increase in the dividend for the 3rd consecutive year, As well as continuing to pursue external innovation to augment future growth prospects with the acquisition of Prevail Therapeutics. This acquisition adds a promising new modality for Lilly by creating a gene therapy program that will be anchored by Prevail's portfolio of clinical stage and late preclinical stage gene therapies across Alzheimer's, Parkinson's, dementia, ALS and other Neurodegenerative disorders. Moving to Slides 56, you'll see a list of key events since our last earnings call. In November, we announced that Arty Shaw, our Senior Vice President and Chief Information and Digital Officer, will retire in the first half Of this year, after 27 years of service to Lilly, she's been an invaluable member of our executive committee and a leader who really models our values.
In addition to leading the development of our digital information strategy, she has developed and mentored talent throughout the organization and demonstrated a deep care For the patience we aim to serve, I want to thank Arty for her many contributions to Lilly. And now I'll turn the call over to Josh to review our Q4 and full year results.
As Dave mentioned, revenue increased 22% this quarter compared to Q4 2019 and increased 7% excluding bamlanivimab sales. Gross margin as a percent of revenue declined 130 basis points to 78.6%. Excluding the impact of bamlanivimab revenue and the related Gross margin as a percent of revenue was 79.9%, in line with Q4 2019 performance. Moving down the P and L, operating expenses grew 3% compared to the same quarter last year. Marketing, selling and administrative expenses were down 8% As reduced activity due to COVID-nineteen and productivity measures offset investments in key growth products, R and D expenses increased 16%, driven by investment in COVID-nineteen therapies.
Net of COVID-nineteen expenses, baseline R and D was relatively Flat and total operating expenses decreased over 5% compared to Q4 twenty As revenue growth far outpaced expense growth, resulting in operating income as a percent of revenue of 33% for the quarter. Excluding the impact of COVID-nineteen therapies, operating income grew 34% in the quarter and the operating margin for our base business Was 32.7 percent for Q4. Other income and expense was income of $477,000,000 this quarter compared to income of $206,000,000 in Q4 2019, driven by investment gains on public equities. As we noted in our Q3 earnings call, beginning in 2021, we will exclude the gains or losses due to equity investments from our non GAAP measures. We have posted a supplemental investor workbook for Q4 on that basis to enable you to have an apples to apples comparison as we move into 2021 and compare to 2020 non Our tax rate was 14.4%, an increase of 180 basis points compared with the same quarter last year, driven primarily by net discrete tax items in both quarters.
At the bottom line, net income increased 58%, While earnings per share increased 59%, net of COVID-nineteen therapies net income and earnings per share increased 43%. Moving to Slide 8, you can see these same non GAAP measures for the full year. In spite of the ongoing demand impact from the pandemic, We grew the top line at 10% or 6% excluding vamlanivimab. Excluding COVID-nineteen therapies, our operating margin expanded by 300 basis points, Contributing to 30% EPS growth while continuing to invest behind our newer products and pipeline. On Slide 9, we quantify the effect of price rate and volume on revenue growth.
As mentioned earlier, worldwide revenue grew 20% in constant currency during Q4, driven by strong volume growth of 24%, partially offset by price. Foreign exchange had a modest impact on revenue growth. U. S. Revenue grew 31% compared to the Q4 of 2019 and 7% excluding bamlanivimab.
For the base business, volume growth of 11% was led by Trulicity, Taltz and Verzenio. Pricing was a 5% drag on U. S. Revenue growth this quarter, to a lesser extent, by changes to estimates for rebates and discounts for Taltz, which was driven by the Access win at ESI. Segment mix was not a major driver of U.
S. Price performance in the 4th quarter as increased utilization in more highly rebated government segments was offset Lower utilization in the 340B segment, primarily for Trulicity and Humalog. Like Q4, the full impact of price was also a headwind of 5%, Consistent with our 2020 expectations for a mid single digit net price decline in the U. S. While the midterm price trends are stable at present, Given the increasing variability in payer mix, we expect to see quarterly variability in our U.
S. Price impact during the course of 2021. Moving to Europe. Revenue grew 12% in constant currency, driven by 9% volume growth and a favorable impact from price. Volume growth was led by Alimta, Trulicity and Taltz.
We're pleased with the continued uptake of our key growth products across Europe and are looking forward to continued strong growth in 2021. In Japan, revenue decreased 10% in constant currency, Driven primarily by decreased volume in post patent expiry products Cialis and Forteo as well as by a modest pricing headwind due to the government mandated price decreases that went into effect in March 2020. Japan is experiencing the impact of countercyclical patent expiries with Cialis, Strattera and Cymbalta LOEs impacting growth in 2020 and likely in 2021. In China, revenue grew 31% in constant currency, driven by 57% volume growth, driven by Tyvett and partially offset by pricing concessions for the government Sponsored programs, which drove TiVIT significant volume growth. We are excited about the momentum of our China oncology business and we are looking forward to continued growth for TiVIT and the launch update for Verzenio.
We're also pleased that Trulicity and Olumiant were added to the NRDL as of January 2021. Revenue in the rest of the world increased 6% in constant currency, driven by strong volume from Trulicity and ILUMIAN as well as 3 percentage points of growth coming from bamlanimab sales to Canada. The same information for our full year revenue is at the bottom of the slide. As shown on Slide 10, our key growth products continue to drive impressive volume growth. These newer medicines delivered nearly 14 percentage points of growth quarter with bamlanivimab also contributing roughly 14 percentage points of growth.
The strong volume growth in our key products was partially offset by post LOE products As well as by reduced Tradjenta royalties from the restructuring of our alliance with Bering Greenwillheim. This impact will sunset as we move into 2021. Slide 11 highlights the contributions of our key growth products. In total, these brands generated over $3,600,000,000 in revenue this quarter, Making up 55% of our base revenue. Amidst the ongoing challenges presented by the pandemic, we are encouraged by the performance of our key growth products in 2020.
Trulicity grew 23%, adding nearly $1,000,000,000 last year to finish with over $5,000,000,000 in revenue, while outgrowing the GLP-one injectable class in the U. S. And exiting 2020 with a nearly 47% share of total prescriptions amidst the reacceleration of growth for injectable GLP-1s, Halls grew 31 percent to nearly $1,800,000,000 in revenue, outgrowing the U. S. Market in both dermatology and rheumatology Entering 2021 with best in class access that provides a strong foundation for long term growth.
Jardiance crossed $1,000,000,000 in Sales for Lilly's share of revenue in 2020, ending the year at nearly 60% of total SGLT2 prescriptions in the U. S. And driving encouraging growth for the class as we look forward to the regulatory action for HFREF and the readout for HF Pass this year. And Verzenio revenue grew nearly 60% in 2020 to over $900,000,000 significantly outgrowing the CDK4 and 6 class, Growing 6 percentage points in total prescriptions, while nearly doubling new to brand share of market on the heels of positive data readouts for overall survival in metastatic breast cancer in 2019 and early breast cancer in 2020. Our key growth products will continue to drive Lilly's strong growth outlook in 2021.
On Slide 12,
we provide an update on capital allocation. In 2020, we invested over $8,000,000,000 to drive our future growth through a combination of business development, capital expenditures and after tax investment in R and D. In addition, we returned approximately $3,200,000,000 3rd consecutive year demonstrating our confidence in the outlook for the company. We are focused on utilizing the strong cash flow our business generates develop the next wave of new medicines through both internal and external sources, as highlighted by the recently completed acquisition of Prevail Therapeutics. We will remain active in assessing bolt on acquisitions or in licensing where we can create shareholder value and enhance our future growth prospects.
Turning to our 2021 financial guidance on Slide 13. We are affirming our non GAAP guidance and we've updated our GAAP guidance to reflect The impact of the Precision Biosciences, Merus and Assahi Kissei agreements, which with reported earnings per share for 2021 now expected to be in the range of $7.10 to $7.75 The impact of the recently completed acquisition of Prevail Therapeutics We'll be updated on our next quarterly call and will only impact Lilly's GAAP guidance for 2021. There will be no change to our 2021 guidance for R and D expense or non GAAP EPS as a result of this transaction. As we move into this new year and as we noted on our guidance call, we continue to experience suppressed demand due to the pandemic With several key therapeutic classes still below our pre COVID baseline, we remain committed to ensuring we are doing our part to limit COVID-nineteen exposure for physicians, patients And our employees as cases surge in the U. S.
And around the world. At present, most of our HCP interactions in the U. S. And many other major markets are virtual. While this may have a near term impact on new to brand performance, we continue to believe our approach is the appropriate posture as we support healthcare professionals navigating the ongoing pandemic And driving broad vaccination to enable a return to normalcy for healthcare systems in the second half of the year.
In addition, our year end 2020 inventory build was approximately $120,000,000 higher than Q4 2019, Which was driven by 2019 having a lower than typical year end stocking. This primarily impacts our diabetes products as well as Taltz and Olymta. We anticipate this inventory will burn off in Q1 2021, like normal historical patterns. As I noted on our guidance call, we also experienced significant COVID-nineteen related stocking benefit of roughly $250,000,000 in Q1 2020. Given those divergent year over year inventory trends, we expect inventory patterns will have a negative impact on revenue growth and operating margin expansion in the Q1 of 2021.
Despite these challenges, we remain confident in our full year outlook for 2021 and have increased confidence in our mid and long term outlook given our recent high quality pipeline readouts. So now I'll turn the call over to Dan to highlight our progress in R and D.
Thanks, Josh. We had an exciting start to 2021 as we read out positive results for genetimab in the Phase 2 trailblazer AL study. Lilly has spent more than 30 years dedicated to finding solutions for Alzheimer's disease, and we are proud of our progress Advancing the science and providing hope for patients and their families suffering from this devastating disease. On Slide 14, You can see our key takeaways from this exciting trial. We are encouraged by the strong efficacy results, where in a relatively small study, we overcame the scale of the study With precision on patient enrollment and a very potent and effective plaque clearing drug, becoming the first ever Disease modification study to hit statistical significance on its primary endpoint.
With the slowing of decline by 32% relative Placebo as measured by the Integrated Alzheimer's Disease Rating Scale. ADRAS is a clinical composite tool combining Instrumental activities of daily living for function. While the study was not powered for assessing multiple endpoints, we're very encouraged by the consistent Improvements observed on all pre specified secondary endpoints for cognition and function compared to placebo, So denanimab did not reach statistical significance on every secondary endpoint. The consistency across time points And across statistical methods was very encouraging, particularly the disease progression model, which is becoming more accepted by the scientific community. In addition, we saw rapid and deep amyloid plaque clearance for denenumab treated patients, Who on average showed an 84 centiloid reduction of amyloid plaque at 76 weeks compared to a baseline of 108 centiloids.
Since below 25 centilloids is a negative amyloid scan, this means that the average denenemab treated patient had a negative scan by the end of the study. Finally, the safety profile was consistent with observations from Phase 1. Amyloid related imaging abnormalities, or ARIA, were observed, Which is consistent with plaque clearing antibodies. In the denenemab treatment group, Area E occurred in 27% of treated participants With an overall incidence of 6% of patients experiencing symptomatic ARIAE. We look forward to sharing the full results of Trailblazer OWLs at the AD PD 2020 1 virtual meeting on March 13, and we plan to have an investor call at 11 am on March 15.
We hope to reproduce and extend these exciting findings in our 2nd pivotal denanimab trial, TRAILBLAZER ALZ II, an 18 month study, Which began enrolling patients last year. At present, the study is expected to complete enrollment later this year with nearly twice as many patients That's the first to trailblazer trial. We'll be engaging regulators to finalize the patient numbers and statistical plans for trailblazer 2, And we hope the exciting results from Trailblazer 1 will increase patient interest and expedite enrollment. Trailblazer 2 was designed last year prior to Trailblazer 1 data. And while the design is similar, at that time, we incorporated a few differences, Including CDR sum of the boxes was moved to the primary endpoint for this larger trial, while ADRAS becomes a key secondary endpoint.
We added a high tau group and we include a blood based screening for enrollment using the p tau biomarker. We look forward to sharing the trailblazer ALS data and discussing next step for deninumab with regulators. Moving to Slide 15. As we discussed in-depth on Tuesday's call, there have been a number of developments for our COVID-nineteen antibodies since our last earnings call, which I will highlight only briefly now. In November, the FDA granted emergency authorization for bamlanivimab as a treatment for COVID-nineteen.
We also submitted a request for EUA for bamlanivimab and etesevimab together, Which remains under review based on Phase II data from the BLAZE I trial. Since the EUA for bamlanivimab, we've shipped approximately 1,000,000 doses And we'll have over 1,000,000 additional doses available through mid-twenty 21 for use around the world. This week, the U. S. Government committed to purchase 500,000 those additional doses by the end of March.
Should an EUA be granted for bamlanivimab and antisevamab together, we expect to be able to supply In collaboration with Amgen, up to 1,000,000 doses of atezevimab for administration with bamlanivimab together by mid-twenty 21 With 250,000 doses available already in the Q1 this year. In just the past 8 days, We've shared Phase 3 data from the BLAZE II prevention trial where bemlimavimab showed up to an 80% reduction of risk of COVID-nineteen for nursing home residents. Phase 3 data from the BLAZE 1 trial for atezevimab together with bamlanivimab, which showed a 70% Reduction in hospitalization or death among high risk COVID-nineteen patients, providing further support for the EUA request for their joint administration. Importantly, there were no COVID-nineteen related deaths In the antibody treatment arms from these 2 pivotal data sets. After having seen these results, Lilly has decided we will no longer conduct placebo controlled studies in high risk patients.
Initial results from the ongoing BLAZE-four Phase II trial provide viral load and PKPD data, which demonstrated that lower doses, Including bamlanivimab 7 100 milligrams and etesevimab 14 100 milligrams together are similar to the 2,800 milligram doses of those antibodies administered together. We expanded the BLAISE-four trial to also evaluate the administration of bamlanivimab with VER-seven thousand eight hundred and thirty one in collaboration with VER and GSK, Reinforcing our commitment to collaborate across the industry to treat current and future strains of COVID-nineteen. And yesterday, We received authorization from the FDA to update preparation and administration instructions in response to feedback from frontline nurses and doctors to enable flexibility, Which can reduce infusion times considerably. These updates can shorten infusion times to as little as 16 minutes. We're pleased with the potential impact our neutralizing antibodies can have, and we're working diligently to make them available to patients around the world.
While the exciting progress with daneumab and the COVID-nineteen neutralizing antibodies has dominated Lilly's news in the past few weeks, We have continued to robustly advance the rest of our pipeline. Slide 16 shows select pipeline opportunities as of January 27. Positive movement since our last earnings call includes the submissions Dave noted for Jardiance and Verzenio the submission of Olumiant for the treatment of COVID-nineteen in Japan The initiation of a Phase III trial for empagliflozin in post myocardial infarction patients, the movement of 2 pain assets into Phase II And the introduction of 8 new Phase I assets, including our first clinical assets from 2 new modalities for Lilly, The siRNA molecule angPTL3 from our collaboration with Dicerna and 2 gene therapy molecules from PREVAIL. In fact, we ended 2020 with a total of 17 new Phase I starts for the year, surpassing 20 nineteen's total of 16 first Which was the highest number of new clinical starts for Lilly in a decade. Considering the significant challenges we faced in 2020, Including temporarily stopping the initiation of new clinical studies, this is a remarkable achievement.
It speaks to the resilience and determination of our R and D organization Challenging times. Moving to Slide 17, we show a final tally of how we finished 2020 versus the key events that we expected to occur. Since our guidance call in mid December, we had submissions for selprocatinib for non small cell lung cancer in Japan, Jardiance for heart failure for reduced ejection fraction in the States and Verzenio for early breast cancer in the United States. The sea of blue checkmarks emphasizes the sheer quantity of pipeline However, my takeaway from the year past is that I am delighted with the quality represented here, Including potentially practice changing data for Type 2 diabetes, for hematologic tumors, for early breast cancer, The launch of a 1st in class RET inhibitor as well as the emergency use authorizations for 2 medicines to help address the COVID-nineteen pandemic. We're proud of the significant achievements delivered in 2020.
As we transition into 2021, I'd like to note that Josh Belenker will be leaving his position as CEO of Loxo Oncology at Lilly to explore other interests and endeavors. We're grateful to Josh for his contributions to human health, both at Loxo And it is time with Lilly. We look forward to working with him in a consulting role. I'm very pleased to announce that Jacob Vernarden is assuming the CEO role, Continue to work alongside Nish Ananda and David Hyman, ensuring leadership continuity and maintaining the strategy and operating model for Loxo Oncology at Lilly. Jake is a very highly talented leader, and this move allows him to continue to grow his responsibilities for the benefit of Lilly and Loxo.
Moving to Slide 18, you can see the expected events for 2021, including the denenimab data and upcoming disclosure I previously mentioned. A number of other major readouts are expected this year, including the remainder of the tirzepatide Phase 3 program We are looking forward to building on the SURPASS-one data we disclosed late last year. The Phase II readout for zagotenumab, Our anti tau antibody for early Alzheimer's in a trial similar in design to the TRAILBLAZER trial that just read out, Several potential Phase III readouts in immunology and the results of empagliflozin for HFpEF. Based on the recent high quality pipeline data readouts for genetimab, tirzepatide and LOXA-three zero five, we entered 2021 by the impact these assets could have on patients, and we're focused on discovering and developing more new medicines to help patients. Now I turn the call back over to Dave for some closing remarks.
Well, thanks, Dan. Before we go to Q and A, let me briefly sum up the progress we made in 2020. 2020 was a remarkable year as Lilly worked to fulfill its promise its purpose in new and important ways. In addition to many contributions in the fight against the global pandemic, our business grew 10% in 2020, driven by strong volume growth from our key growth products launched since 2014. These products now account for more than half of our revenue for the first time.
We continued our productivity journey, delivering nearly 300 basis points of operating margin expansion for our base business. We made significant progress on our innovation based strategy With Loxo-three zero five, tirzepatide and Verzenio early breast cancer readouts delivering potential category changing data, Well, January's dononumab top line success was a first in Alzheimer's. With EUAs for bamlanivimab and Olumiant to combat COVID-nineteen And bolt on acquisitions of Dermira and Prevail book ending the year, the past 12 months have been an exceptional example of Lilly's success in leveraging internal and external innovation. We returned nearly $3,200,000,000 to shareholders The dividend and share repurchase. And we will have another meaningful dividend increase, which we announced in December, reflecting significant confidence in the ongoing strength of our business.
All of this was accomplished against the headwind of a pandemic that is still raging. While the New Year does not free us from that near term challenge, our long term outlook Has never been stronger. This concludes the prepared remarks, and I'll turn the call over to Kevin for the Q and A.
Thanks, Dave. We'd like to take questions from as many callers as possible. So we ask that you limit your questions to 2 per caller. Tawny, please provide the instructions for the Q and A session,
Our first question comes from the line of Jeff Meacham with Bank of America. Please go ahead.
Okay, thanks. Good morning, everyone. Thanks for
the question. Just have a couple. Dan, on Donatumumab, I know you're planning on having regulatory discussions, but beyond expanding Trailblazer ALKS 2, Is it reasonable to start a 3rd study just to expand the safety database and the treatment experience? And then Josh, You mentioned you're still seeing commercial impact from COVID. What would you say are the franchises that were mostly affected in 2020?
And maybe just review your assumptions for normalization of some of those in 2021. Thank you.
Thanks, Jeff. Anne and Jeff?
Yes. Thanks, Jeff. Your question is whether we'd consider starting a 3rd denanimab study to improve the safety database. No, we haven't considered that At present, of course, as we said, our next step is to discuss the data set we have with regulators. I think if we Determine that we need more patients, the place to do that is the TRAILBLAZER II study.
With respect to additional studies, I think there could be opportunities to For other populations and we're working through those possibilities right now, but we don't see that necessary for this current population.
Thanks, Jeff. I think when we look across our therapeutic areas, it's relatively consistent at this point that we're still not quite back To new to brand prescriptions in key areas like immunology, pain and diabetes, although the diabetes Numbers are looking stronger as we get here into January. But I think we're still seeing some suppressed demand. Physicians have, I think in most markets have figured out how to see patients safely and we're seeing nothing like what we saw back in April May in the U. S.
So I think we just have to be cautious as we get into the Q1 and realize that the more complex treatments Have some higher degree of variability against them and that includes starting new patients in areas like migraine. I think maintenance has been good throughout the pandemic. So we do expect that as we get through the first half of this year, we'll see Earned at fully normal levels, but I think it's fair to assume that in the Q1, we'll still be in many of the therapeutic areas A little bit below pre COVID baselines in terms of new prescription starts.
Okay, great. Thanks, Craig.
I was mentioning, Jeff, as well, derm, because I think that one also you see some suppression in new patient starts, Not affecting our share, anything but just the overall volume in the category.
Thanks, Dave. Jeff, thanks for your questions. Next caller, please.
Thank you. Our next question comes from Tim Anderson with Wolfe Research.
Thank you. A A couple on denanimab. Investors are naturally wondering what the odds are that you could file for approval based on This first Phase II trial, to me it seems highly unlikely given the size of the trial and the different subgroups, but And then Dan, your view of the need to continue to knock down what is Sometimes described in the industry as toxic oligomers, which is what you might achieve by giving monoclonals Chronically well after patients have already seen plaque normalization.
Thanks, Tim. We'll go to Dan for both of those. Great.
Tim, so your first question is on the possibility of approval from a single study in Alzheimer's disease. Look, we in general, we don't To disclose our back and forth with FDA or other regulators, in this case, of course, we've said that next steps are discussions with regulators. So clearly, that hasn't happened yet. Still, we understand the regulatory threshold traditionally has been adequate and well controlled trials. That means more than one trial.
In this case, we have a single adequate and well controlled trial in Alzheimer's disease. That, as I said, has not been the standard in this area. Of course, in other disease areas, notably in oncology, drugs can be approved from a single trial. Usually, that's an accelerated approval. Usually, So a group that's well defined by pathologic characteristics and biomarkers, usually there's dramatic pathologic response Well, of course, that's also true in the case of this dineumab trial, But again, oncology is quite different than Alzheimer's disease.
Your second question was on The question of toxic oligomers, it's long been unclear what is the toxic species of abeta, is Monomers, is it oligomers, is it plaques? This antibody was designed to be exquisitely specific for amyloid plaques. We don't think it binds oligomers. And thereby the efficacy therefore, the efficacy we see here seems to imply that it's the plaques that are the toxic species rather than the oligomers. However, we can't rule out that these two things are in equilibrium with each other and perhaps by clearing Flex, you remove a Lycamore as well.
Thank you, Dan.
Tim, thanks for your questions. Next caller, please.
Next question comes from the line of Umer Raffat with Evercore. Please go ahead.
Hi, thanks so much for taking my questions. Dan, in the prior studies, the iADRS The composite that you used in denanimab, it didn't correlate very well with CDR some of the boxes. But I did find it interesting that The most recent expedition 3 trial for solenizumab did have high concordance between this new composite versus CDRs on the boxes. I guess what I'm wondering is how should we be thinking about whether ADRS versus CDRs on the boxes It correlates closely or not? Or is it more a function of the more recent trials where CDR does in fact correlate very closely with ADRS?
And I'm thinking about that heading into your denanimab trial. The other one I had is you have this tau antibody Phase 3 coming up this year. Maybe if you could remind us how is this tau mab similar or different than some of the other ones because the progress on this target has not been Quite good to date and I saw your trial was pushed out a little bit as well, but it will be very helpful to have any color. Thank
you. Thanks, Umer. Dan?
Great. Thanks. Umer, for your first question on ADRAS and its correlation with CDR, look, when we think about an endpoint for any clinical trial, there is really two things that make an endpoint, a good endpoint. One is the statistical validation behind it. So in other words, is it reliable across different patients, across different time points, across different trials?
We've put together a lot of data that support that. 2nd, is it meaningful for patients? And in this course case, of course, we believe that that's Inherently true, this is a composite of 2 things that are widely used, both thought to be important and meaningful ADAS COG and activities of daily living, Obviously, activities of daily living inherently meaningful for patients. Now why did we pick IHS versus CDR to be the primary outcome of the study? That should be obvious.
It's because we believe that iDRESS would be more sensitive for measuring decline and therefore more sensitive for measuring a drug effect. That's based on all of that statistical validation data that we did. If iDRAS and CDR sum of the boxes were perfectly well correlated, Then I guess couldn't be better, couldn't be more powerful. And yet I'm telling you that our assumption going into this trial was that it would be. So Of course, different outcomes will have some correlation, but they won't be perfectly correlated.
Based on what we saw in this trial, I think we haven't changed our thinking on outcomes and we still think iDRESS It's a very valid and important outcome for Alzheimer's trials. Of course, that's a discussion to be had with regulators in the scientific community. With respect to zagatinumab, this is our anti tau antibody. Just as denanimab was a different type of anti amyloid beta based on its specificity for plaques, Zagatinumab is a different kind of anti tau antibody. It's highly specific for aggregated tau.
Now we think that's particularly important in the case of tau because there's a lot of soluble monomeric tau and tau antibodies like any other antibody, not much of it gets in the brain. So if you have a lot of monomer and a little bit of antibody, it could sop up all of your antibody and not have left to go after what we think is the more important species aggregated Tau. So we'll have to wait and see. Of course, this is a field that is younger than anti amyloid therapies, but we've taken a lot of things we learned from anti amyloid, applied them to anti tau, and we're quite looking forward to getting that data later this year. Thank you.
Thanks.
Umer, thanks for your questions. Next caller, please.
Yes. Our next question comes from the line of Steve Scala with Cowen. Please go ahead.
Thank you. Two questions. Investor expectations are quite high for denonimab in terms of sales potential. Lilly knows the full data for Trailblazer and also the largely failed abeta antibody landscape better than any other company. Based on what you've said, including that denonimab will be a driver in 'twenty five through 'thirty, it sounds as though you are Fully comfortable with these multibillion dollar expectations.
Is that the conclusion you want to leave us with? Secondly, Loxo-three zero five looks like it could be best in class in oncology and the safety looks favorable. Has Lilly ruled out non oncology indications for 305 potentially, MS Or perhaps for the sister BTK that you also have. Thank you.
Thanks, Steve. We'll go to Dave for the first question and then Dan for the second one.
Yes. Steve, I mean, we don't comment on analyst models or forecasts and we never would. So I can't directly answer your question. I guess what I can say is We've invested in Alzheimer's for 30 plus years and spent a lot of money, as you point out, mostly failing, because there's a huge unmet medical need and we believe that investment justified based on the size of the market. But we're not able to say today, donutemab Is that answer has a path to market, etcetera?
We're not saying any of that. We're looking forward to the ADPD presentation coming up. The field will survey that data and make their own conclusions, and we need to talk to the FDA in a formal way about the path forward, and Then we'll get to sales forecast later. But
it's just not possible to
answer a question like the one you asked.
Dan? Okay. The second question, more straightforward. Loxo-three zero five is really uniquely Specific reversible BTK inhibitor with great drug properties, that's why it's Generating such remarkable data in oncology, you're asking a question that we've thought a lot about, which is could this also translate Being a highly differentiated molecule in immunology, I think in this case, we would not pursue The same molecule, I think, this is down the road, far enough in oncology, this will be an oncology molecule. But you raised the question of whether we'd be generating a sister molecule as you said for immunology indications.
That's certainly something we are considering.
Thank you.
Thanks Dan. Steve, thanks for your questions. Next caller please.
Our next question comes from the line of David Risinger with Morgan Stanley. Please go ahead.
Yes. Thanks very much and congrats on the updates. I have two questions, please. First, When do you expect to have clarity from the FDA on whether Lilly can file with the single small Phase 2 trial On daneumab. And then second, would Lilly consider changing the primary endpoint for Trailblazer 2, which is currently CDR Thank you.
Thanks, Dave.
Dan? Okay. Thanks, Dave. Your first question is on the potential for filing, which I think we addressed before. We haven't had those discussions with the regulators.
Of course, we move quickly to understand the data and schedule discussions With regulators around the world, as I said before, the regulatory standard is adequate and well controlled trials. So Two trials there. But certainly, we'll be interested to hear what regulators
say. Thank you. Yes.
And the second question is,
the change over the year
primarily. Sorry, Dave. So the second question there is, would we change the endpoint? Yes, of course, we can consider it. I think we look at the totality of data that we get from Trailblazer 1 and that will inform our decisions As well as conversations with regulators.
But so far, we haven't seen anything or that leads us to make that decision to change it. Thank you.
Thanks Dan and Dave. Thanks for your questions. Next caller please.
Thank you. Our next question comes from Terence Flynn with Goldman Sachs. Please go ahead.
Hi, this is Dan on for Terrence. Thanks for taking our question. Just one from us. On LOCKS-three zero five, if Scott, if you believe there's a path to filing for approval on the Phase onetwo data? Thank you.
Yes. So we'll go to Anne White for that one.
Well, thanks, Terrence, for the question. And we're obviously very excited about the data, both in CLL and BCL. So we do have ongoing discussions with the FDA regarding the potential for accelerated approval. Obviously, in this place, the single arm accelerated approval But be assured that we'll continue those conversations. And we couldn't be more excited about the data, as Dan mentioned.
I think this molecule really started As a molecule focused on CE41 mutations and then as we saw the data and the performance in the broader population is remarkable. So we'll keep that with the conversations going and we'll keep you posted.
Thanks, Ann. Ann, thanks for your question. Next caller, please.
Thank you. Our next question comes from the line of Chris Schott with JPMorgan. Please go ahead.
Great. Thanks so much. Just one on Denonim Avenue, which is one other one. What are your thoughts on the high tau population? I guess just based on what you saw from Trailblazer, is there a Strong rationale the drug could also work in some of these patients.
And maybe just give us a sense of what percent of patients in trailblazer 2 we should expect to come from that group. Now my second question was just you did make some changes to your 340 program reimbursement last year. Maybe just remind us the Scope of that business in your portfolio and have there been any either challenges or pushbacks with the implementation of that and how we should be kind of thinking about 340B as we go through 2021. Thank you.
Thanks, Chris. We'll go to Dan for the first question and then Josh on 340B. Yes.
Thank you, Chris, for a question about the high tau population. A notable feature of the trailblazer trial is that we excluded patients who had too much tau in their brain. We believe that people who have the highest tower spread throughout their brain are past the point of no return at least for an amyloid directed Of course, as we fully analyze this data and hopefully even in time for the upcoming presentation, We'll understand what we're seeing in this current data set with respect to baseline tau levels predicting response to therapy. As we see that, that could lead us to be either more excited or less excited about including high tau patients In Treblazer II study, and so that is something that is still very much open. As we see that data and understand it, We could think about changing the design there.
In terms of the percent of patients that are impacted here, it sort of depends on how you cut it. If you start with all of the early Alzheimer's patients, which is mild AD plus MCI, That's about $4,500,000 in the U. S. And double that in Europe and Japan combined. Many of those patients will be amyloid negative.
We've shown that before. So you take about a third out for that. A small fraction of them will be amyloid positive, but No tau at all. We didn't include those patients. And then a slightly larger fraction will be, in that tau high group.
So Once you've excluded all those patients, we've said it's sort of 30% to 45% of that mild AD to MCI population That would meet these enrollment criteria in Trailblazer 1.
Thanks, Dan and Josh.
Hi, Chris. On 340B, what we've Seth is, if you look over the last 10 years, the 340B segment has been among the fastest growing, certainly across the industry, but for our business as well. And It rivals the size of Medicaid in our U. S. Business, so about 10% of the business now.
Of course, the change we made was to go back to the legislated intent and to provide the discounts to the actual hospitals That provide care and to exclude contract pharmacies that have grown over time. And when we look at that business, that's probably about half of the business is in these So that's where we've made the change to not provide the pricing there. Now we do have a process where those contracted pharmacies Can apply and we've said for insulins, as long as they can demonstrate that they're passing on the entire pricing that they're still eligible to participate. We look at all that together, we knew that there that's where we implemented in September. We knew there would be challenges and We're seeing those challenges come, but I think in terms of patient impacts, we haven't seen much yet.
So we're seeing The fact that the discounts aren't being provided as per our change, but we don't think it's impacting patient care at this point. So everything we're seeing so far is Consistent with the decision we made, we knew it would be a difficult decision to implement. We knew there would be some Customer concerns, we knew there would be legal challenges, but I think what we saw in the Q4 is consistent with the guidance we've given for 2021, Which is that we would expect this portion of the 340B program to moderate in growth and provide a 2 to 3 point Price tailwind for us in 2021. So I think we're on track for that at this point.
Thanks, Josh. Chris, thanks for your questions. Next caller, please.
The next question comes from the line of Seamus Fernandez with Guggenheim. Please go ahead.
Great. Thanks. So I just wanted to Follow-up on the one zenanaumab question, which is, Dan, can you just give us A little bit of color on the magnitude of blinding in this study, given the fact that Patients obviously had almost absolute clearing of their amyloid plaques, and you're confident That the behavior of the placebo arm was consistent with the benefits of monitoring both tau And amyloid. And then the second question, just wanted to get a bit of an update on Verzenio and how Verzenio is tracking Relative to your expectations, I think we're starting to see fits and starts, I guess, to some degree in terms of capturing incremental market share, But directionally, it seems positive. Just trying to get a sense of where Lilly thinks the uptake could go In metastatic disease, and then how ultimately an approval of The adjuvant opportunity can impact sales or your market share going forward.
Is that really the big driver Or are you already seeing meaningful changes in metastatic markets here? Thanks so much.
Thanks, Seamus. We'll go to Dan for the first question and then Anne for the second. Yes.
Thank you, Seamus, for those very thoughtful questions Focused on that blinding of the study. We said before that, TRAVELAZER 1, we carried this study out With the quality that we typically use for regulatory pivotal studies, fully blinded, double blinded study, You raised the possibility that there could be some unintentional unblinding as a result of amyloid clearance. We don't see that that's possible. Patients don't No or feel the clearance of amyloid in their brain directly, and investigators wouldn't have seen that, the results of the PET Again, themselves. The other potential in any Alzheimer's study for inadvertent unblinding is ARIA E, Because sometimes that is something that can cause a side effect and we commented on the 6% of patients that had symptomatic RAE Or so.
I think that's certainly an important analysis, I think, in every study in Alzheimer's disease is to look at the drug effect With and without RA patients and certainly that's something that we hope to have complete and be able to share in March. And then finally, you asked about the behavior of the placebo arm. That's a great question. Really, when we saw this data, that was the first thing I wanted to look at. Sometimes when you have small studies that look promising, it's because your placebo arm did worse than typical.
And here we said, We've communicated a high level of confidence and encouragement based on the data. So that excludes that possibility. This placebo arm is not Behaving aberrantly, that's not what's driving the effect. Again, we'll get into the details of that in March, but very, very pleased with the performance of the placebo arm
Thanks, Dan. Ann?
Yes. Thanks for the question on Verzenio. So as you noted, 2020 was Really another year of very positive and clinically meaningful data for Resenio. And then our shares as a result, I think, continue to improve. While obviously no CDK is yet approved in the EBC setting, we do think that these readout this readout particularly drew attention to the market class.
So that said, we're really confident that the current trends are a result of our strong execution and our focus on MBC And then the particularly statistically significant OS data, which a key competitor in the space didn't have. As we compared Q4 'nineteen to Q4 'twenty, it was really a remarkable period of growth, as you said, for Verzenio. We saw a TRx increase of 66%, Worldwide revenue growth of 57% and U. S. Growth of 36%.
And what we're hearing pretty repeatedly now from thought is that they're seeing more and more that Verzenio is a differentiated agent. So obviously, we've shared that in MVC, we feel we have higher CDK So activity versus others, differentiated continuous dosing, a monotherapy indication and then obviously the data that we saw in MUNAR-two with the primary endocrine resistant population. So I think all of that is really playing into the growth that we're seeing in the MVC market. And so we'll expect to continue to see Our growth our shared market grow in that space. On the adjuvant side, as Dave and others mentioned, we submit to the FDA and other areas at the end of last year, so we look forward to regulatory action later this year.
This market size is significant in the fact that it's probably an additional 50%, if you match our entry criteria, 50% increase to our current metastatic market in this high risk adjuvant population. So that's significant. And what's also significant is the duration of treatment will very likely will be longer than in the metastatic setting. So patients in the study are treated for 24 months. And right now, we're seeing patients stay on for 17 or more months on average In the study, and many of the patients are still on the study, so I think that number will continue to get longer.
So that duration of treatment offers upside as well. We're incredibly excited about the data. We're looking forward to bringing it to patients as soon as possible. Thanks for the question.
Thanks, Ann. Seamus, thanks for your questions. Next caller, please.
Next, we go to the line of Andrew Baum with Citi. Please go ahead.
Thank you. A couple of questions. First on denanimab. On the issue of whether potentially denanimab could be submitted on the back of the Phase 2 data set you have. Could you talk to your level of preparedness, particularly manufacturing, Given the anticipated demand, but also to the pitau blood test that will potentially be used to define the patient, I'm just trying to understand Where are you at?
Because there is a scenario by which you could be on the market sooner than perhaps many may believe. And That's an open observation rather than reflecting any particularly personal view. And then second, for Anne, could you talk to your BTK inhibitor 305. I know you're hiring medical liaisons already, which in hematology would suggest that you're optimistic about being able to file in the From your understanding of the community matrix practice for CLL, given the very high tolerability of this drug and the strong efficacy, even without a I see. Even without a randomized trial, do you believe that this drug could take significant market share in the first BTK
Thanks, Andrew. We'll go to Dan for the first question and Ann for the second.
Andrew, you raised an excellent question on all the work that needs to be done to prepare for We initiated manufacturing preparedness before we had this data. So this is something we do at Lilly. We always prepare for success. And so at the same time that our manufacturing colleagues were ramping up the anti COVID antibodies, we asked them to also prepare for denanimab. So that is well underway and I like what's going on, the progress we're making in manufacturing there.
The diagnostic ecosystem also needs work. We started that both ramping up imaging and proceeding along with opportunities bring the phospho tau blood test to more patients. That's both underway, again, started before we had this data. And that, of course, is useful, whether we're successful in coming to market or whether any other, anti amyloid drug comes to market. Those are preparations that we're certainly taking.
Thanks, Dan. Anne?
Yes. Thanks for the question on 305. So with the With MSL population, it's important to remember this arm of our company talks about the work that's going on in our across our portfolios. This is not just related to 305, but we have other assets in the portfolio that may be heading in the space. So I wouldn't read too much into that.
It's normal operations to make sure that we're covering the portfolio. But obviously, they do did you get many questions about 305? The excitement is out there in treating And importantly, we have a number of large Phase III trials that are starting as well. And as you know, that field force helps us identify high quality sites to include in those programs. As far as CLL, obviously, the story there is incredibly exciting, and we do think that we have a real contender here.
And Particularly what we're interested in seeing is what has been seen in the past, certainly in the area of oncology, is that drugs that have a meaningful Treatment effect on the same target pathway in patients who have relapsed tend to have sometimes an even more pronounced effect in that first line And so that's the upside here that is the potential for Loxo-three zero five is that first line setting. So this year, we're actually planning to initiate, as you know, 4 global clinical studies and 3 of them are in CLL. And obviously, 2 of them are in the BTK Appreciate the patience, but one is in that really in that head to head setting and looking at some head to head with Ibrutinib in CLL. Obviously, this is a riskier study to do. We still feel very confident in the later line setting, but we do have a belief that this molecule has a lot of potential in the In the first line, but hence doing the trials.
So I would say, as I said earlier, I can't comment on the regulatory likelihood. Those are ongoing conversations with the But regardless, we know that in this space, you need randomized clinical trials to really reach the patients that we wish And so, that's the intention is to do those trials regardless.
Thanks, Ann. Andrew, thanks for your questions. Next caller, please.
Our next question comes from the line of Greg Gilbert with Truist Securities. Please go ahead.
Thanks. So the COVID antibodies, Dave, I realize the latest data is quite fresh. But to the extent you're worried that there could be a disconnect The power of the data and the speed of uptake, is there anything that Lilly plans to do proactively to help move this along? I was intrigued by her comments on the prior call about some well known hospitals being slower than other hospitals to get trained and ready, and I think that was even from before this latest Dataset. And then maybe for Josh, on that call, it sounded like the upper limit of $2,000,000,000 in your guidance is not necessarily set in stone If demand picks up, what's the practical limitation from a manufacturing standpoint as it relates to, 2021 for the antibodies?
Thanks.
Thanks, Greg. And we'll go to Dave and then Josh. Okay.
Yes, I'll comment, Andrew. And I mean, since the beginning, we've been working With healthcare systems and physicians across the country that enable uptake of the antibodies, I guess it's in some ways a test of what happens when you don't have The normal commercial preparation and rollout, this was done via government channels under an EUA, and you see big differences In adoption rates, and I highlighted what seems to be an inverse relationship between the places you think about advanced medicine and who's actually using this. One of those barriers clearly is conviction on the data. So I'm really pleased with the data we announced in the last week, and I think it will Has to, increased conviction. And this is also there's a class effect here too.
And the fact that Other antibodies are demonstrating promise in different settings adds to that data and I think will build confidence. So hopefully that We'll change. There's 2 endorsements as well we hope will change. 1 is NIH, the other is the Infectious Disease Society. That's it.
There's tons of practical problems with, at scale infusing people with COVID-nineteen that have been Completely worked out by numerous health systems and not worked out by many, many others. So we work quite a bit with state departments of health, etcetera, to Share those practices. The best practice is chart flagging upon positive COVID-nineteen for at risk patients, Scheduling of appointments, dedicated facilities and staff for high throughput antibody administration. Where that's happening, they're using a lot of material and you can almost see actually a reduction in healthcare utilization. So We're actually running an experiment like that in New Mexico to actually prove it, and as well as with UnitedHealthcare.
But I'm optimistic that we'll see the rate of use grow. It moved from about 20% in December to about Double that now. We hope to see more progress going forward.
Thanks, Dave. Josh?
Yes. Thanks, Craig. So what we've said for this year is guidance range for COVID antibodies is $1,000,000,000 to $2,000,000,000 And of course, there's a lot of uncertainty in that. Although with what we've announced this morning on the call, the next agreement that we've signed with the U. S.
Government It's probably high probability for $1,000,000,000 in the Q1. That's just the purchase agreements that we already have. I think then to get past that, we have, based on what we've already committed to in terms of manufacturing, probably about another 500,000 Bamlanivimab, dose is available in the first half of the year in monotherapy and a million combo. So If we sold all of that and it's weighted heavily towards the U. S.
Or high income countries, you could get above $2,000,000,000 But We don't have an EUA with the U. S. Government or any other government for the combo yet. And there's a lot to still play out, I think, in terms of And where these products can be utilized. If we get into the second half of the year, I think we can continue at the pace of production of 1,000,000 plus doses available per quarter.
I don't think the manufacturing piece is going to be As much of a barrier in the second half of the year, if we stay on the course of vaccines and otherwise. So Clearly, we could be above $2,000,000,000 for the year, but there is a lot of uncertainty and we'll continue to monitor this number and provide updates as we have more agreements and more approvals.
Thank you. Thanks, Josh. Greg, thanks for your questions. Next caller, please.
Next, we go to the line of Ronny Gal with Bernstein. Please go ahead.
Good morning. Congratulations on nice results, and I will continue in the tradition of asking one On daneumab, I guess the bar that you can see from the FDA It's Juan Kanak well internally correlated trial and data support elsewhere. When I look at your program, it looks like the support you could provide is from removal of plaque From earlier trials. I guess the question for you is, is the understanding that plaque removal is related to Clinical benefit is solid enough that you can use that as supporting data, or is the logic for early approval based elsewhere? As for a non Donaimo question, I was going to go back to the 340B prices.
The signs are increasing from this year. There might be an action on this issue Before the end of 2021, I just want to kind of confirm that you have not assumed in your model got full impact for the entire year, but there is Some sort of a partial assumption or some sort of a partial impact that you've modeled in.
Thanks, Ronny. We'll go to Dan and then Josh.
Yes. Thanks, Ronnie. It's a really good question that you're asking, which is how strong is the biomarker evidence here and how can that be used to support regulatory decisions? I certainly think that's the direction the field is going. So in other words, when I look across all of the trials that have read out, again, this is the first Plaque removing antibody that has had a positive study that hit its primary endpoint on the prespecified statistical analysis.
But even the other ones that didn't do that, when you look across the totality of evidence, you get a sense that There's a correlation between plaque removal in general and better cognitive performance. Here we have probably the most significant plaque removal, the fastest, deepest plaque removal and a very meaningful clinical So it's another point in this sort of dose response curve comparing amyloid plaque removal and cognitive changes across different trials. As that gets filled out further and further by additional experiments, I think amyloid plaque removal could someday become An important surrogate that could aid in the regulatory approval of drugs. Are we there today? I don't know.
That's a question For regulators and for the field and something that we certainly have believed in for many years and will continue to take up.
Thanks, Dan. Josh? Thanks, Ronnie. As I mentioned earlier, we've guided to a 2 to 3 point price benefit in 2021 As a function of the 340B changes that we've made, we've been very clear on 340B that reason for the change is that We're providing discounts that patients don't get and we want the program needs to be reformed and cleaned up. So Our assumption is in 2021, there will be changes.
And as I mentioned earlier, we also have mechanisms for contract pharmacies to get the discounts. We want to ensure that patients on insulin can get the pass through discount. So we're assuming in our 2021 guidance that Not a full financial benefit for the full year that there will be changes and modifications through the year either as we try to work to ensure patients get the benefits of the The discounts or if there are some administrative or legislative changes. Great. Thank you.
Thanks, Josh. Ronnie, thanks for your questions. Next caller, please.
Our next question comes from the line of Vamil Divan with Mizuho Securities. Please go ahead.
Great. Thanks for taking my questions. So I also have a couple on the Alzheimer's theme. So one just on the second Alzheimer's tetraplegic An issue we've seen with other CNS drugs, maybe not as much in Alzheimer's, but you get these positive results, everyone gets excited. But then the second trial, you might Have to manage more of a placebo response or improperly getting patients into the trial.
So I'm just wondering if there's anything you're doing Definitely or more carefully to make sure for the second trial you don't have patients who maybe get into the trial that otherwise shouldn't have or
And then
my Second questions are unrelated, but I guess partially related. The Phase 1, you mentioned that tau more from where you terminated. I'm just wondering if you can share any
Thanks, Vamil. We'll go to Dan for both of those.
Yes. Thanks, Vamil. It's a good point you raised. Of course, placebo effect getting stronger in second trials is something that's been seen a lot in psychiatry and sometimes in pain studies. As you pointed out, I'm not sure it's such a strong effect in Alzheimer's disease.
One thing that encourages us here and I think would allow us to The strong signal even if there is some of that here is maybe 2 things that encourage us. First is the magnitude of the effect that we're seeing overall, Which, as I said, hit stat sig even in the small trial and Treblase II is much bigger. 2nd is the consistency across endpoints and Time points and statistical methods. That gives us additional confidence as well. With respect to the your second question, which was the taumorpheramer, for the Alzheimer's program here with AC Immune, We decided to pursue other promising telmorpheromir candidates from AC Immune's research platform, And therefore, we terminated this Phase 1 molecule.
That's probably all we say right now.
Thanks, Dan. Ronald, thanks for your questions. Next caller, please.
Thank you. Our next question comes from the line of Carter Gould with Barclays. Please go ahead.
Good morning, guys. Congrats on the progress. Dan, I guess, I keep up the trend of Alzheimer's first. I guess, just can you talk first around your longer term view towards Combination approaches with denanimab, particularly with an anti tau inhibitor. And then, you had good momentum across the pain portfolio in And you've got a number of Phase 2 studies reading out with your epiregulin antibody.
Any color there on your level of confidence? And if those data represent the key inputs Regarding a get go, no go decision to Phase 3 or will you need additional Phase 2 work, longer safety data and any commentary on how you see that coexisting with Thanks,
Carter. Dan?
Great, Carter, two good interesting questions. So on combination approaches for I do think that's what the future holds. One of the really neat things about daneumab Is that we just treat until amyloid plaques are removed. This is not a drug that we anticipate patients will be taking for the rest of their lives. Once they're clear of amyloid plaques, we stopped treatment with this drug.
We know from prior data that plaques don't come back. So you can imagine clearing a patient amyloid plaques and then treating them with another mechanism that could be complementary, for example, an anti tau Drug or an immunomodulatory drug for Alzheimer's disease. So that's certainly something that we're considering and And quite likely we'll pursue in the future. Thanks for noting momentum in the pain space. This is an area that is just so underserved By the pharmaceutical industry, I think there's a variety of reasons, including regulatory thresholds that have held back investment in an area that represents One of the greatest unmet medical needs, this is why patients the number one reason why patients see a doctor is because they are they're in pain.
And we know the drawbacks to current therapies. So we designed a platform pain study, which actually tests That's multiple molecules against multiple indications, and we can keep funneling molecules in and get results out. Depending on the strength of the efficacy here, that will inform next steps, but we're confident that this That is well designed to show us whether we have meaningful treatment effects or not. Of course, a hold back in pain, as I said before, is The regulatory bar, which is heavily weighted towards safety and typically that takes a large number of patients to discharge, Certainly, tanezumab, a perfect example of that with so many patients studied and a well understood signal here On both efficacy and potential safety that needs to be resolved for the FDA.
Thanks, Dan. Carter, thanks for your questions. Next caller, please.
Yes. And the next question comes from Carrie Holford with Berenberg. Please go ahead.
Hi, thank you. Just a couple left for me, please. Firstly, on Prevea, I wonder if you can talk And then more about this decision to acquire here. What attracted you to this particular gene therapy platform versus others? And when might we see the data readouts for the lead assets?
And indeed, when might we see these potentially come to market? And then my second question is just more housekeeping in nature. You talked about a stocking benefit in Q4. I think it was $120,000,000 Could you detail which drugs that impacted primarily and whether you'd expect to unwind into the next quarter? Thank you.
Thanks, Carrie. We'll go to Dan for the question on the Prevail acquisition and then Josh on the stocking question. Yes.
Thanks,
Carrie. We're really excited to have Prevail join Lilly. This is a really great gene therapy platform, why we picked and a great team. Those are clearly two of the reasons why we picked Prevail. Also, I think there's just a natural synergy with the work we do at Lilly.
We're extremely strong in neuroscience. We have a deep commitment to this space. And therefore, as we thought about what's our entry point into gene therapy, and we believe gene therapy will be an important treatment modality Across therapeutic areas in the future, it made sense to enter gene therapy to begin our efforts here in neuroscience. Prevail has got 2 exciting programs in the clinic already. One is for Parkinson's disease with GBA1 mutations and it's a GBA1 gene transfer.
There's a lot of face validity to that kind of approach and we're looking forward to seeing data from that. The other similarly well validated target here in Frontotemporal dementia with GRN mutations, and that's also, I think, exciting. In terms of timelines to market, I think it's These programs are still very early. We're just in the first few patients here, and want to see what the data show to inform those timelines.
Thanks, Dan. Josh?
Thanks, Carrie. Yes, on inventory, what we said is if you look at Q4 2020 inventory in the U. S. Inventory levels versus Q4 of 2019 were $120,000,000 higher. We're not concerned about that.
2019 was an unusually low year when you just look at days of stock. So the 120 is in line with our expectations. But now as we look into Q1 2021, we do expect that $120,000,000 Burn off and it's across the portfolio, but as you would imagine Trulicity is one of the products. We see a little bit extra in Taltz and I think some of this is a function of the Anticipation of increased volume for Taltz as a function of the ESI win that will go into that went into effect on January 1. And we also see some on Olimta.
We did see some purchasing patterns through the year in oncology, I think some of which was related to the pandemic and Some delays in infused products, but those are probably the 3 biggest products where we see this on. So we would expect that $120,000,000 to burn off Q1 as it normally does. The other piece though that we want to make investors aware is remember last year in Q1, We saw a $250,000,000 build in inventory on a worldwide basis. This was as customers were stocking up in anticipation of the lock Downs that were coming with the pandemic. So I think if you put those two things together, the 250,000,000 Bill, last year and what we assumed to be $120,000,000 burn this year, that's about $370,000,000 Headwind when you just do year over year compare in growth and that could be up to Six points or something.
Again, it's not a concern, it's built into how we think about the year, but we do want to remind investors on that piece. Now, and I think throughout the year, we're going to have some strange compares. Remember that we sold $871,000,000 in Bimlimavimab in Q4, we expect to have significant sales this year as well. So we'll tease all that as we go through. But On the underlying base business, you should expect to see an inventory negative growth effect in Q1.
Thanks, Josh. Kerry, thanks for your question. And we'll go to Dave now for the close.
Great. Thanks, Kevin, and to the team. We appreciate everyone's participation in today's call, Of course, your interest in Eli Lilly. 2020 was a strong year for the company and we anticipate an important year in 2021. A lot of questions related to Alzheimer's today.
We're excited about that as well. But just a reminder, we have upcoming readouts for tirzepatide We sustained 2, 35 over the coming weeks months as well as a number of readouts this year in our immunology portfolio For baricitinib, lebrikizumab and mirikizumab in important indications, the company has a broad and diversified Set of opportunities ahead for additional innovation for patients. With our strong lineup of marketed products as well In this industry leading pipeline, we believe we continue to be a compelling investment. So thanks for dialing in. Please follow-up with the IR team if you have any additional questions.
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