Good day. My name is Chantelle, and I will be your conference operator today. At this time, I would like to welcome everyone to the Kala Pharmaceuticals second quarter 2022 financial results conference call. As a reminder, today's conference call is being recorded. All lines have been placed on mute to prevent any background noise. After the speaker's remarks, there will be a question-and-answer session. If you would like to ask a question during this time, simply press star followed by the number one on your telephone keypad. If you'd like to withdraw your question, please press star one again. Thank you. Hannah Deresiewicz from Stern Investor Relations, you may begin your conference.
Thank you, operator, and thank you all for participating in today's call. Joining me from the company are Mark Iwicki, Chairman and Chief Executive Officer, Kim Brazzell, Head of R&D and Chief Medical Officer, and Mary Reumuth, Chief Financial Officer. Darius Kharabi, our Chief Business Officer, will also be joining us for the Q and A portion of today's call. During this call, we will be referring to non-GAAP financial measures, which are not prepared in accordance with generally accepted accounting principles. A reconciliation of the non-GAAP financial measures to the most directly comparable GAAP measures is available in our press release issued today, which can also be found on our website. On this call, we will make certain comments about Kala's future expectations, plans, and prospects that are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.
These statements will include statements regarding the development program and market potential of KPI-012, planned reductions in operating expenses, and the sufficiency of our cash resources. These and other forward-looking statements are based on the beliefs and expectations of management as of this conference call. Our actual results may differ materially from our expectations. The company undertakes no obligation to revise or update any forward-looking statements to reflect events or circumstances that occur after this conference call, except as required by law. Investors should carefully read the risks and uncertainties described in today's press release, as well as the risk factors, which identify specific factors that may cause actual results or events to differ materially from those described in our forward-looking statements included in the company's quarterly report on Form 10-Q and other filings we make with the SEC.
I will now turn the call over to Kala's CEO, Mark Iwicki.
Thanks, Hannah, and thank you everyone for joining us this morning. We are entering the second half of 2022 focused on transitioning from a commercial stage company back to our roots as an R&D organization, with our efforts targeted on developing novel medicines that can improve the care and treatment of serious eye diseases. In July, we completed the sale of EYSUVIS and INVELTYS and transitioned all responsibilities for the global commercialization of both assets to Alcon Inc. This was an important transaction for Kala and, more importantly, for the patients and healthcare providers we aim to help. Kala made meaningful progress in launching these products in the United States, including building awareness among healthcare professionals and securing strong payer coverage. We believe Alcon is particularly well-suited to expand the reach of both medicines.
Alcon has decades of experience delivering market-leading vision care products around the world and benefits from robust franchises in dry eye disease and surgical care, including longstanding relationships with the eye care professionals and patients, EYSUVIS and INVELTYS, are targeted to. We are excited about the Alcon transaction and look forward to seeing many more patients benefit as a result of their efforts. With EYSUVIS and INVELTYS in Alcon's hands, we've turned our focus to our mesenchymal stem cell secretome platform, which we are evaluating for the treatment of multiple rare diseases of the front and back of the eye.
As Kim will describe shortly, we are on track to initiate a phase II, III clinical trial of KPI-012 for the treatment of persistent corneal epithelial defect in the fourth quarter of this year, and we anticipate expanding development of KPI-012 into two additional indications, partial limbal stem cell deficiency and Sjögren's disease. Together, these rare diseases affect nearly 300,000 people in the United States alone, resulting in significant morbidity, including potential loss of vision. These indications represent large markets for which there are currently no approved prescription treatments and provide ample opportunity for us to positively impact the treatment of patients in need. R&D is at the core of who we are as a company, and our team is eager to leverage our development expertise to advance KPI-012 through the clinic and to further develop our secretome platform.
Importantly, we also have the means to invest substantially in these efforts. At the close of the transaction, we received $65 million from Alcon, which included an upfront cash payment of $60 million plus an additional $5 million for the purchase of inventory. Going forward, we are eligible to receive up to $325 million in commercial-based milestone payments. We believe our existing cash resources and recent reductions in operating expenses will allow us to fund our operations beyond the data readout from the planned phase II,III trial of KPI-012 in PCED. Now I'd like to turn the call over to Kim to discuss our pipeline programs.
Thank you, Mark. I'm happy to share our progress with the KPI-012 program and additional work we're doing with our mesenchymal stem cell secretome platform. As Mark mentioned, we're on track to file an IND for KPI-012 and to initiate a phase II,III clinical trial in persistent corneal epithelial defect patients in the fourth quarter of this year. We've also made significant progress towards identifying additional front of the eye indications and are currently evaluating potential of KPI-012 for the treatment of partial limbal stem cell deficiency and the ocular manifestations of moderate to severe Sjögren's, both of which are areas of significant unmet medical need. In addition, we're also exploring some exciting retinal applications for the secretome program.
As we've discussed previously, KPI -012 is an application of our novel technology utilizing secretomes harvested from human bone marrow-derived mesenchymal stem cells. The secretome approach allows us to produce a cell-free therapy comprised of essential biomolecules secreted by the mesenchymal stem cells, including growth factors, protease inhibitors, matrix proteins, and neurotrophic factors with the potential for multiple therapeutic applications. Because our approach is cell-free, it allows for many of the same benefits as more traditional cell therapies without the need for the administration of intact cells, which we believe will avoid many of the safety and logistics concerns associated with current cell therapy approaches. We are initially advancing KPI -012 for the treatment of persistent corneal epithelial defects, or PCED, which is defined as a non-healing corneal wound or defect that is refractory to conventional treatments.
PCED is a disease of impaired corneal healing that can be the result of numerous underlying etiologies, including but not limited to neurotrophic keratitis, infectious keratitis, surgical or non-surgical trauma, and severe ocular surface disease of various causes. Corneal healing is a highly regulated multifactorial process that involves numerous biological pathways and molecules. We believe that effective treatment of PCED across its various etiologies require a multifactorial mechanism of action, such as that of KPI-012 to address the impaired healing that is the hallmark of the disease. PCED affects an estimated 100,000 patients each year in the U.S., and we believe it represents a potential market opportunity in excess of $1 billion.
There is one approved therapy in the PCED space, Oxervate, which has only been shown to be effective for the treatment of neurotrophic keratitis, which is estimated to be the underlying etiology for only 1/3 of all PCED cases. This therapy is quite burdensome for the patients. It is dosed 6 x day at two-hour intervals for eight weeks and requires a multi-step reconstitution process prior to each dose. We believe there is a clear unmet need for a new therapy that can provide benefit for all the various etiologies of PCED and improve the vision and quality of life of all PCED patients. As we have shared previously, the initial clinical trial conducted with KPI-012 in PCED patients of various etiologies demonstrated benefit in all eight evaluable PCED patients with complete healing of the PCED lesion in six of eight of these patients.
KPI-012 was well-tolerated in the trial with no significant safety issues. Pending FDA clearance of our planned IND, we plan to initiate a phase III trial in PCED patients in the fourth quarter of 2022, which, if positive, could serve as one of the two required pivotal trials necessary for FDA approval. We expect top-line results from this phase II,III trial in the first quarter of 2024. Based on the compelling mechanism of action and numerous interactions with key opinion leaders, we're also evaluating the potential of KPI-012 for the treatment of partial limbal stem cell deficiency or partial LSCD as we call it, and for the ocular manifestations of moderate to severe Sjögren's.
Limbal stem cell deficiency is an ocular surface disease characterized by the loss or deficiency of stem cells in the junction of the cornea and limbus, where they play an essential role in the generation and repopulation of corneal epithelial cells. When the limbal stem cell population is reduced or depleted, the ability of the corneal epithelium to repair and renew itself is compromised, which can result in recurrent epithelial breakdown, neovascularization, conjunctival overgrowth, and other sequelae that can lead to loss of corneal clarity and vision impairment, as well as significant pain and diminished quality of life. There are currently no approved pharmaceutical products for the treatment of LSCD. Approximately 70% of LSCD patients or about 70,000 patients in the U.S. have partial LSCD, meaning they have some level of remaining stem cells but still suffer significant pathology and symptomatology.
We believe these patients would be appropriate candidates for KPI-012 to maintain the integrity of the ocular surface and to avoid the vision impairment and pain associated with the disease. In addition to the effects of KPI-012 on corneal healing observed in both animal models and in PCED patients in the previous trial, there's data in the literature that suggests that MSC secretome could also restore the limbal stem cell niche, which would be a significant benefit in both partial and complete LSCD. The other ocular surface indication of interest is Sjögren's, a chronic multisystem autoimmune disease characterized by insufficient fluid production in certain glands of the body, leading to substantial dryness, primarily of the eyes and of the mouth. Approximately 90% of Sjögren's patients suffer from ocular manifestations and experience significant ocular symptoms, with often impacting the patient's daily life and productivity.
As a result, the quality of life in Sjögren's patients can be significantly diminished. Despite current treatments, many Sjögren's patients do not achieve significant improvement in their ocular symptoms. There's a significant unmet need for new therapies that can provide meaningful improvement in the ocular symptoms, visual impairment, and quality of life to the approximately 50% of Sjögren's patients, or roughly 95,000 people in the U.S., who suffer with moderate to severe disease. We estimate that partial limbal stem cell deficiency and the ocular manifestations of moderate to severe Sjögren's together represent a total potential market opportunity of between $1.5 billion and $2 billion in the United States alone. Finally, as we mentioned earlier, we also believe our secretome platform has potential utility for retinal degenerative diseases such as retinitis pigmentosa and Stargardt disease.
We plan to initiate preclinical trials evaluating the utility of our Secretome platform for retinal degenerative diseases in the coming months, with the goal of selecting a retinal indication for further development in the second half of 2023. Taken together, we believe our efforts with KPI-012 and our Secretome platform provide ample opportunity to improve the treatment of a number of severe ocular surface diseases that impact thousands of patients around the world. We look forward to providing additional updates as we initiate our phase II,III clinical trial in PCED, we plan for later this year and to potentially expand our efforts into additional indications in 2023. Now I'd like to pass the call to Mary to go over our financial results.
Thanks, Kim. During this discussion of our financial results, I will reference our non-GAAP financial measures. These non-GAAP financial measures exclude stock-based compensation, non-cash interest, depreciation and amortization, loss on extinguishment of debt, transaction costs related to the Alcon transaction, and gain or loss on fair value measurements of deferred purchase consideration and contingent consideration. For a full reconciliation of our GAAP to non-GAAP financial measures, please refer to today's press release, which is available on our website. Turning to a recap of the second quarter, our cash position as of June 30, 2022 was $44.6 million compared to $92.1 million as of December 31, 2021. This decrease primarily reflects cash used in operations. Our cash position as of June 30 does not include the net proceeds we received in early July in connection with the closing of the Alcon transaction.
We anticipate that our cash resources, together with the net payments received from Alcon and planned reductions in operating expenses, will enable us to fund operations into the second quarter of 2024. Over the course of the year, we have been working to reduce our operating expenses and extend our cash runway. Following the closing of the Alcon transaction, we have streamlined our corporate infrastructure and plan to reduce our non-GAAP operating expenses by more than 50% as compared to our non-GAAP total operating expenses for the first half of the year and by 60%-70% for the full year 2023 compared to our non-GAAP total operating expenses for the full year 2021.
SG&A expenses were $22.7 million for the second quarter of 2022 compared to $27 million for the first quarter of 2022, primarily reflecting reductions in employee-related spending. Non-GAAP SG&A expenses were $20.4 million for the second quarter of 2022 compared to $24.7 million for the first quarter of 2022. R&D expenses were $4.5 million for the second quarter of 2022, which was consistent with the first quarter of 2022 and includes expenses related to the development of KPI-012. That concludes our prepared remarks for today. I will now pass the call over to the operator for questions.
At this time, I'd like to remind everyone to ask a question, please press star one. Our first question comes from Yi Chen with H.C. Wainwright. Your line is open.
Hey. Congratulations on all the progress. I'm Kate on behalf of Yi Chen. First, on your pipeline progress, where are you with those two programs, LSCD and Sjögren's pre-clinically? Are you still waiting on some pre-clinical data before pushing through to the clinic? The second question I have is on KPI-012. I'm pretty sure you must have commented on this previously, but do you need to see some data from your phase II,III study before you start thinking about the other pivotal study that is required for the eventual approval? Lastly, if you could comment on your cash runway and when you would potentially need to raise further funds, that'd be helpful. Thank you.
Excuse me. This is Kim Brazzell. I can comment on your first couple of questions. With regard to your second question, we certainly will be doing preparations prior to the top-line data readout, but we will need the results from that readout to finalize the second pivotal phase three trial around dose and duration of dosing and so forth. With the other two indications, we're still doing analysis of the development pathways going forward and are looking into clinical designs for the protocols. We're still a bit of a way off from being able to go in the clinic.
One of the advantages of these two indications is that we can utilize the CMC and the clinical supplies that we are developing for the PCED program, so we won't have to do additional CMC work. We'll be able to move into the clinic without having to do additional work on the product itself.
I think there was a question on runway for Mark or for Mary.
Sure. I can take that cash runway question. We said that our cash resources, together with the net proceeds that we received from Alcon would last us until the second quarter of 2024. That gets us beyond the data readout from our KPI-012 phase II,III trial.
Excellent. Thank you.
Again, if you would like to ask a question, please press star one. We have reached the end of the question and answer session. I'll now turn the call back over to Mark for closing remarks.
Well, thank you everyone for joining us today, and we look forward to continuing to update you as we make progress during the year. Have a great day.
This concludes today's conference call. You may now disconnect.