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Operator
Good morning, and welcome to the Aldeyra Therapeutics Third Quarter 2018 Financial Results Conference Call. (Operator Instructions) Please note, this event is being recorded.
I would now like to turn the conference over to Joshua Reed, Chief Financial Officer. Mr. Reed, please go ahead.
Joshua Reed - CFO
Good morning, everyone. I'm Joshua Reed, Chief Financial Officer of Aldeyra Therapeutics, and welcome to the Aldeyra Therapeutics conference call to discuss our third quarter 2018 financial results. With me today is Dr. Todd Brady, Chief Executive Officer of Aldeyra Therapeutics.
Before we get started, we would like to remind you that this morning, we filed a press release containing financial results for the third quarter of 2018. I encourage you to review the press release as it contains important information.
This conference call contains forward-looking statements regarding future events and the future performance of Aldeyra. Forward-looking statements include statements regarding Aldeyra's possible or assumed future results of operations and expenses, business strategies and plans, research, development and commercial plans or expectations, trends, market sizing, competitive position, industry environment and potential growth opportunities, among other things.
These statements are based upon the information available to the company today, and Aldeyra assumes no obligation to update these statements as circumstances change. Future events and actual results could differ materially from those projected in the company's forward-looking statements. Additional information concerning factors that could cause results to differ materially from our forward-looking statements are described in greater detail in the company's press release and the company's filings with the SEC.
Now I'd like to turn the call over to Dr. Todd Brady, President and Chief Executive Officer of Aldeyra. Dr. Brady?
Todd C. Brady - CEO, President & Director
Thank you, Joshua. The third quarter was another landmark quarter for Aldeyra as we announced positive results from 2 important clinical trials, our Phase IIb clinical trial in dry eye disease and an investigator-sponsored clinical trial of ADX-1612 in mesothelioma.
In terms of disease, our broadly active topical ocular product candidate, reproxalap, demonstrated clear and consistent efficacy versus vehicle across a variety of signs and symptoms, and perhaps most important from our perspective was the finding that drug activity appears to occur as early as 2 weeks after initiation of dosing, a commercially differentiating factor that could potentially position reproxalap as a first line therapy in a market where currently available therapies may require weeks or months for even modest efficacy, and where patients and physicians are generally dissatisfied with the standard of care.
As many of you know, the demand for novel therapies in dry eye disease is high. Dry eye disease is a persistently disturbing condition that affects approximately 20 million patients in the United States. And based on the Phase IIb clinical results, we believe reproxalap has the potential to represent an important therapeutic approach in dry eye disease, and we expect to initiate Phase III clinical testing in 2019 following an end of Phase II discussion with the FDA early next year.
Relative to what a drug disease therapy is, reproxalap has demonstrated a uniquely broad therapeutic profile. Particularly interesting is the efficacy of reproxalap in allergic conjunctivitis, a condition that often occurs in conjunction with dry eye disease, potentially due to the fact that pollen is a major determinant of ocular dryness and irritation. Following 2 successful Phase II clinical trials in allergic conjunctivitis, the Phase III ALLEVIATE clinical trial was initiated earlier this year, and we look forward to announcing the results in early 2019.
Topical ocular reproxalap has also demonstrated activity in noninfectious anterior uveitis, a rare but severe autoimmune disease of the eye that can lead to blindness. Topical ocular corticosteroids can be used to treat this disease but lead to serious ocular toxicities, including glaucoma and cataract formation. Based on previous Phase II clinical results demonstrating that reproxalap was statistically noninferior to corticosteroid therapy in noninfectious anterior uveitis and that reproxalap did not lead to increases in intraocular pressure that were observed in corticosteroid-treated patients, we initiated the Phase III SOLACE trial last year and we remain on track to announce results next year.
Reproxalap is also a potential therapy for Sjögren-Larsson Syndrome, an orphan inborn error of metabolism characterized by a severe and intractable skin disease known as ichthyosis. Based on positive Phase II results demonstrating unprecedented activity, the Phase III RESET clinical trial was initiated earlier this year, and we remain on track to announce the results from Part 1 of the Phase III trial in the second half of next year.
We expect that 2019 will represent a late-stage, catalyst-filled year for Aldeyra as results from the ALLEVIATE, SOLACE and RESET Part 1 Phase III trials are expected to be announced.
In the third quarter, we were pleased to report positive results from the investigator-sponsored Phase I/II clinical trial of ADX-1612 in pleural malignant mesothelioma, a rare but terminal cancer with a poor prognosis. In contrast, the typical response rates of 20% to 40% with currently available therapy, response rates in the MESO-2 investigator-sponsored trial announced at the World Conference on Lung Cancer in September were 61%. We expect to initiate a Phase II clinical trial next year, pending discussion with regulatory authorities.
We are also excited for the planned 2019 initiation of clinical testing for our earlier development programs, including ADX-629 for immune-mediated disease, ADX-103 for retinal disease and ADX-1612 in post-transplant lymphoproliferative disorder and ovarian cancer.
Now I'd like to turn the call back over to Joshua to discuss the third quarter financial results.
Joshua Reed - CFO
Thank you, Todd. For the third quarter of 2018, we reported a net loss of approximately $10.8 million compared to a net loss of approximately $5 million for the same period last year. Basic and diluted net loss per share was $0.52 for the quarter compared to $0.32 per share last year. Losses have resulted from the costs of our clinical trials and research and development program, as well as from our general and administrative expenses.
R&D expenses were $7.9 million for the third quarter of 2018 compared to $3.5 million for the same period in 2017. The increase of $4.4 million is primarily related to the increase in research and development expenditures, including manufacturing, preclinical and clinical development costs, and an increase in personnel costs.
General and administrative expenses were $3.1 million for the third quarter compared to $1.5 million for the same period last year. The increase of $1.6 million is primarily related to an increase in legal and patent-related costs, consulting costs and personnel costs.
In the third quarter of 2018, total operating expenses were approximately $10.9 million compared to $5 million in the prior year. Cash, cash equivalents and marketable securities were $35.1 million as of the end of the third quarter of 2018. In October 2018, we were pleased to close an underwritten public offering of 5,250,000 shares of common stock, raising net proceeds of $67.6 million after deducting underwriting discounts, commissions and estimated expenses.
We expect our current cash will be sufficient to fund our operations through the end of 2020 including the currently planned announcement of top line data from a Phase III clinical trial in dry eye disease, the Phase III SOLACE trial in noninfectious anterior uveitis, the Phase III ALLEVIATE clinical trial in allergic conjunctivitis, Part 1 of the Phase III RESET trial in Sjögren-Larsson Syndrome, a Phase Ib clinical trial in NASH and a Phase IIa trial in post-transplant lymphoproliferative disorder. Additionally, we believe our funding will be sufficient to allow for in-licensing of technologies that are complementary to our current product candidate pipeline.
In summary, we believe that we are well funded to execute on our mission of developing novel immune-modulating therapies across multiple mechanisms of action and multiple product candidates.
That concludes our remarks. Operator, please open the call for questions.
Operator
(Operator Instructions) The first question today comes from Adam Walsh with Stifel.
Neil Eric Carnahan - Associate
This is Neil on for Adam. Just a question on the Phase III dry eye study. Can you talk to us about what you're thinking as far as inclusion criteria there, specifically on just severity of disease in patients?
Todd C. Brady - CEO, President & Director
Yes. Thanks for the question, Neil, and thank you for hosting us yesterday at the Stifel conference. It was a superb opportunity for us. Yes, so the Phase III is going to be very similar to Phase IIb in terms of inclusion criteria. And the Phase IIb is very similar to, more or less, the industry standard in terms of enrollment. The trick is not to enroll patients that are too severe because they're intractable to therapy. They don't respond. And also, companies don't want to enroll patients that are too mild either because then there'll be a more dramatic placebo vehicle response. So moderate patients are generally what most trials enroll, we stuck to that premise in Phase IIb. We will continue that in Phase III so as to change as little as possible. And hopefully, we can replicate the impressive results that we observed in Phase IIb.
Operator
The next question comes from I-Eh Jen with Laidlaw and Company.
Unidentified Analyst
This is [Chris] speaking on behalf of I-Eh Jen. I wanted to ask, in the upcoming clinical trial of ADX-1612 in post-transplant lymphoproliferative syndrome, how do you compare this dosage with the dosage of other cancers such as ovarian? Can you guys speak to that?
Todd C. Brady - CEO, President & Director
Yes, that's the thing, [Chris]. That's a great question. We're very excited about the general strategic transition or addition, I should say, of systemic programs to our pipeline, which, in late stage, is predominantly topical, topical ocular, topical dermal. PTLD represents I think one of our first major efforts to move systemically with our product candidates. This is a disease that is a serious immune-mediated disorder caused by hyperproliferation of leukocytes following solid organ transplant. Now patients that have transplants aren't the picture of health, that's why they're being transplanted. To add to the issue there, some of these patients will get a lymphoma-like hyperproliferation of predominantly lymphocytes, and this is the disease that we intend to test with ADX-1612. The doses of 1612 that have been previously used in cancer trials are generally MTDs, that is maximally tolerated doses. We do not intend to test patients with MTD doses of 1612. I think those generally, in all cancer therapeutics, generally lead to toxicity. In PTLD, which is not a cancer per se, we could get away with lower doses of drug and thereby increase our therapeutic index, that is, still manifest efficacy in this disease without causing toxicity. So I think when you see more details about the trial next year and as it's initiated, you'll find that the doses we're using are actually lower than what has been used in the past in cancer trials.
Operator
(Operator Instructions) The next question comes from Esther Hong with Janney.
Esther Lannie Hong - Director of Biotechnology
So first in allergic conjunctivitis, can you remind us of the changes in the trial design in the ongoing Phase III study from the Phase IIb and the potential impact of those changes? And then second, can you provide any updates on the feasibility studies and how those would impact the second Phase III study in allergic conjunctivitis?
Todd C. Brady - CEO, President & Director
Right. Thank you, Esther. Good morning, and thank you for that important question. There is very little change from Phase IIb to the Phase III ALLEVIATE trial in allergic conjunctivitis. The major change is more patients. As you'll recall, this is an allergen provocation study, a challenge where allergen is administered directly to the eye, that has been the industry standard over the past decade or so. And that's exactly what we did in the Phase IIb trial, it's exactly what we're doing in the ALLEVIATE trial. We were impressed with the statistical differentiation between drug and vehicle in the Phase IIb trial in allergic conjunctivitis. That was with approximately 30 patients per arm. As you know, the ALLEVIATE trial is about 100 patients per arm, thus, we are over 90% powered for our primary endpoint, which is area under the itch score curve. As you'll recall, the itch score is 0 to 4, 0 meaning no itch and 4 meaning incapacitating itch, and that's measured over 60 minutes. What's interesting is that most antihistamines are sort of a standard of care in allergic conjunctivitis, most antihistamines measure itch over about 7 minutes. And as a physician and even as a patient, I don't think many of us are very concerned about what happens to patients over 7 minutes. I think we're much concerned about long-term activity. And that's exactly how reproxalap works, and it's exactly what we're testing in the Phase III ALLEVIATE trial after the allergen challenge. Now your next question relates to the subsequent Phase III trial. As you know, in allergic conjunctivitis and other non-orphan disorders, 2 large, well-controlled trials are required for approval. The second Phase III trial will be based on environmental exposure to allergens. So instead of directly administering allergen to the eye, allergen will be in the environment. There are 2 flavors of environmental exposure. One is a field trial, where drug is administered to patients during allergy season. Patients have a diary, and they note their itch and redness and other symptoms and signs. The other flavor is a chamber, which is essentially a small room where allergen is aerosolized in defined quantities and patients are exposed over a 2- to 3-hour period to those allergens in the air. Both of those kinds of environmental exposure are the subject of methods-development clinical trials that we have ongoing and enrolling at this moment. And I think early next year, around the time of the ALLEVIATE results, you could expect to hear from us on the preliminary top line results of those methods-development trials and then how that informs the second Phase III that you mentioned in your question.
Operator
Since there appears to be no further questions, this concludes our question-and-answer session and our conference. Thank you for attending today's presentation. You may now disconnect.