Mihael Polymeropoulos
Analyst · Jason Butler of JMP Securities
Thank you very much, Kevin. Good afternoon, everyone. The third quarter has been an outstanding quarter, despite the pandemic disruption, which peaked in the late spring.
The late spring disruption did affect demand for both HETLIOZ and Fanapt as measured by new scripts for each of the products. Given the several week delay from the time the script is written to time to fill for HETLIOZ, the late spring impact on HETLIOZ demand translated to fewer starts in the third quarter. Despite that, and given the continued strong adherence, HETLIOZ revenue was minimally impacted.
Our sales force returned to the field in the summer and has effectively navigated local medical office closures and implemented telemedicine approaches. Since late August, we have seen a significant increase in new HETLIOZ scripts, with total new scripts in September reaching all-time highs.
This trend has continued in October, and we estimate, again, another record high for new HETLIOZ script generation in this month. Despite the expected payer hurdles, we remain optimistic that this demand will translate soon to revenue and fuel HETLIOZ growth in the fourth quarter and lead us with a positive momentum in 2021.
The HETLIOZ new script volume comes from both blind and sighted Non-24 individuals, with the larger portion of these new prescriptions involving the sighted Non-24 population.
On Fanapt, Fanapt's revenue in the third quarter was relatively flat compared to the second quarter. Early in the summer, we launched a direct-to-consumer campaign with national television advertisement. While it is early in the campaign, the lead indicators of website visits and searches saw significant increase as compared to before the initiation of the campaign.
Qualitatively, the campaign has initiated a national dialogue on schizophrenia aimed at reducing stigma for this devastating illness. In parallel, awareness for our Fanapt brand is entering the national state and is being inserted into the vocabulary of the U.S. population. We remain optimistic that awareness will lead to new starts that will hopefully translate to an increase in the number of patients on treatment.
While we continue the marketing sales efforts aimed at growing our commercial revenue, we're also focused on our research and development pipeline on both the already commercialized as well as our pre-commercial pipeline products.
The FDA review of our application in Smith-Magenis Syndrome for tasimelteon is ongoing. The FDA has granted priority review for this orphan indication and has set a PDUFA action date in early December. The FDA is evaluating our applications for 2 formulations of tasimelteon in SMS, the capsule formulation for adults, and the liquid formulation for children.
Smith-Magenis Syndrome is a new developmental disorder caused by a genetic mutation of chromosome 17, which is a microdeletion in 90% of the patients and a point mutation in the RAI gene, which is included in the microdeletion region in the remaining 10% of the patients. The most common and most disruptive clinical expression of the disorder is a sleep disorder that impacts the function of patients and, consequently, their families. There is no approved effective treatment for these patients.
Vanda has been working over the years in collaboration with a patient advocacy organization, PRISMS, to develop HETLIOZ for SMS and bring it to patients. We plan to continue our collaboration and expand our efforts to increase awareness of the disorder and, once approved, the product for the broader SMS patient population.
SMS patients receive their diagnosis through a small number of specialized genetic labs. Vanda has and will continue to establish relationships with all of this context across the spectrum of the diagnostic and therapeutic patient journey. Vanda is well positioned with the existing know-how and existing sales force personnel to support the marketing sales of HETLIOZ in SMS.
SMS affects 1 in 20,000 births, with an estimated U.S. prevalence of approximately 15,000 patients. Approximately 200 of them have already participated in Vanda's SMS registry, and hundreds are associated with the PRISMS advocacy organization.
While thousands of patients are already diagnosed with DNA tests, many more remain undiagnosed. Vanda plans to establish a program and a network that will assist in improving awareness for SMS, while enhancing and accelerating diagnostics. We're eager to receive FDA marketing authorization and bring this important product to patients with SMS and their families as soon as possible.
On tradipitant, the pivotal Phase III study in gastroparesis has reached the milestone of more than 50% enrollment for the study. As we have previously communicated, we believe the current Phase III study can be the last efficacy study required for NDA filing. With enrollment estimated to be complete in the first half of 2021, we expect an NDA filing for gastroparesis later in 2021. A partial clinical hold for studies longer than 3 months prevent us from collecting patient safety data for longer than 3 months, which may affect the NDA filing.
The estimated prevalence of gastroparesis in the U.S. is over 5 million patients, the majority of which remain undiagnosed. The only FDA-approved treatment for gastroparesis is metoclopramide, first approved in 1979, which, due to its potential of severe side effects, carries a black box warning and limitations of use of no more than 3 months.
Based on IQVIA data, there are over 3 million prescriptions of oral metoclopramide annually. Given the highly limited treatment options and the safety and tolerability profile of metoclopramide, we believe that a new therapy could achieve significant market share and can represent $1 billion peak revenue opportunity for Vanda.
Other Phase III/IIb programs in motion sickness and atopic dermatitis have paused new randomizations until deemed safe enough to continue clinical studies given the COVID-19 pandemic.
In August, we announced the results of the interim analysis from the ODYSSEY study with tradipitant in patients with COVID-19 pneumonia, which showed tradipitant may accelerate clinical improvement in patients with COVID-19 pneumonia. This early analysis suggests that tradipitant may act by accelerating the time to clinical improvement for patients with severe COVID-19 pneumonia.
If confirmed, this effect may be of significant clinical benefit for patients as well as for public health by decreasing the amount of resource employed in the treatment of patients with severe COVID-19 pneumonia. Although preliminary, these interim results are in. A larger sample size will be required to definitively determine whether tradipitant offers therapeutic benefit in hospitalized patients with COVID-19 pneumonia by accelerating time to clinical improvement. The results from this interim analysis will be submitted for publication in the peer review journal.
Additional clinical programs for HETLIOZ in delayed sleep phase disorder and insomnia in autism spectrum disorder are in the final stages of planning before beginning their respective Phase III programs early next year.
Clinical development programs for Fanapt, including bipolar disorder, Parkinson's disease psychosis and the long-acting injectable formulation in schizophrenia are also in various stages of preparation.
This week, we announced that the FDA has approved the investigational new drug application to evaluate Cystic Fibrosis Transmembrane Conductance Regulator, CFTR, activator, VSJ-110, for the treatment of allergic conjunctivitis. This approval marks the beginning of Vanda's development of therapeutics in ophthalmology by exploring the compound's dual anti-inflammatory and prosecretory mechanism of action.
The initial Phase II study will evaluate the acute antiinflammatory effects of VSJ-110 in an ocular allergic challenge model and will evaluate the prosecretory effects using standard ocular fluid assessments. The results from this Phase III study will help guide further development of VSJ-110 to treat a variety of ocular inflammatory conditions, including dry eye disorder.
Dry eye disorders are a major health care burden, with an estimated worldwide prevalence of 5% to 20%. About 60 million are reported to be affected in the United States, and more than 10% of people older than 50 years old are affected. While heterogenous by etiology, dry eye disease presents with common clinical signs and symptoms, which include corneal epithelial injury, decreased ocular fluid and clear breakup time and patient-reported symptoms of ocular discomfort or functional impairment in a low humidity environment.
Treatment options available in the United States at present include artificial tears, punctal plugs and the topical antiinflammatory drugs, cyclosporine and lifitegrast. Despite available options, and even with the successes of RESTASIS and Xiidra brand names, dry eye disease is increasing in incidence and remains an unmet medical need.
Other relevant indications include chronic inflammatory conditions, such as internal conjunctivitis, which remain fully addressed with current treatment options.
To conclude, we're optimistic about the growth prospects of our commercial products, HETLIOZ and Fanapt, as we enter the fourth quarter and look for positive momentum into the next year. We look forward advancing all our pipeline programs, and we're particularly looking forward to the FDA decision on our SMS applications in December. And beyond that, we're excited for the completion of the gastroparesis program and NDA filing in 2021.
I will now turn the call back to Kevin to discuss our financial results for the quarter. And after that, I will be happy to address any questions you may have. Kevin?