Mihael Polymeropoulos
Analyst · Jefferies
Thank you very much, Kevin, and good afternoon, everyone. Thank you all for joining us to discuss Vanda's first quarter 2024 results.
Let me start by providing details on the progress for our psychiatry portfolio of compounds. Fanapt was approved on April 2 as a first-line therapy for the acute treatment of manic or mixed episodes associated with bipolar I disorder in adults, which -- for this discussion, I will refer to as bipolar I disorder.
The results of the study supporting this approval were published in the Journal of Clinical Psychiatry earlier this year. This approval for bipolar I disorder significantly expands the addressable patient population for Fanapt, where patent exclusivity is expected to last at least through late 2027.
For milsaperidone the active metabolite of Fanapt, a New Drug Application, NDA, is expected to be submitted to the Food and Drug Administration in early 2025. If approved for marketing for schizophrenia and bipolar I disorder, there are pending patent applications that, if issued, could extend exclusivity into the 2040s. We're currently planning clinical programs to test the efficacy of Fanapt and milsaperidone in the treatment of depressive symptoms, which, if successful, will significantly further expand the addressable patient population.
In addition, we are planning to initiate a registration study of the Fanapt long-acting injectable or Fanapt LAI formulation by the end of 2024. Fanapt LAI in earlier studies has demonstrated a profile compatible with a once-a-month administration offering a significant tool to address compliance issues in this disease population. Fanapt LAI could reach the U.S. market after 2026, and their pending patent applications that, if issued, could extend exclusivity into the 2040s.
This is a key differentiation from some currently marketed branded antipsychotics for which physical chemical properties or dosing requirements prevent the development of long-acting injectables. Fanapt LAI could potentially address a large patient population with chronic psychiatric conditions where compliance is a significant treatment challenge. We're also evaluating the use of Fanapt LAI in the treatment of major depression for which there is currently no approved long-acting injectable treatment.
In addition to Fanapt, milsaperidone has further differentiated physical chemical properties that beyond the oral formulation could permit the additional development of long-acting injectables with variable duration that could extend up to several months. It is worth underscoring that most currently approved drugs in this atypical antipsychotic class have not been formulated as long-acting injectables, making Fanapt and milsaperidone differentiated and it's greater than $1 billion estimated commercial opportunity.
It is our vision to develop a multiproduct psychiatry portfolio that will address multiple psychiatric indications and will expand the estimated addressable patient population to over 20 million people across these indications.
Turning now to HETLIOZ. HETLIOZ, our circadian rhythm regulator approved in 2014 for Non-24-hour sleep-wake disorder is the first and only treatment approved for this disorder that disproportionately affects totally blind people. HETLIOZ with its unique mechanism of action, has revolutionized treatment for this disorder and has significantly impacted patient's lives.
HETLIOZ LQ was approved in 2020 for the treatment of nighttime sleep disturbances in Smith-Magenis Syndrome, again offering the first-ever approved treatment for symptoms of this rare orphan disorder.
The FDA application for HETLIOZ in insomnia received a complete response letter from the FDA in March 2024, and the final agency action of our application for the treatment of Jet Lag Disorder is being challenged in the U.S. Court of Appeals for the D.C. Circuit. A study of HETLIOZ in the late sleep phase disorder, an indication with no approved treatment is ongoing in the U.S. and Germany. We're currently evaluating the initiation of the clinical program with HETLIOZ LQ in pediatric insomnia for children with or without neurodevelopmental comorbidities.
HETLIOZ LQ is not subject to a generic challenge at this time. Although exact estimates of prevalence of insomnia in children are difficult to quantify, it is estimated that 20% to 40% of children experienced significant sleep problems. There are currently no approved treatments for pediatric insomnia. If ultimately approved for marketing the addressable patient population for HETLIOZ LQ will be significantly expanded and market exclusivity would be expected to last in the 2040s.
The HETLIOZ capsule formulation commercial opportunity is subject to the launch of the 3 generic formulations. Vanda is currently challenging all 3 products on the grounds of unlawful FDA approval, patent infringement and other statutory violations in U.S. Federal Courts. We believe that the exceptional mechanism of action of HETLIOZ can be leveraged to address the needs of millions of people that suffer with disorders where the circadian rhythm circuitry is perturbed.
Turning now to PONVORY. With the December 2023 acquisition of PONVORY, this makes the third commercial stage product for Vanda. Currently approved as a once-a-day oral treatment for people with multiple sclerosis. PONVORY has a differentiated profile from other drugs in the class with high specificity and rapid reversibility making for a versatile use to address the need for people with multiple sclerosis.
The transition from Janssen, a Johnson & Johnson Company is progressing well with the completion expected in the coming months. In preparation for the U.S. commercial launch, Vanda is planning a cost of commercial activities, including the creation of a specialty sales force, a prescriber awareness program and a comprehensive marketing program. In addition, Vanda is evaluating PONVORY in additional autoimmune disorders, including psoriasis and ulcerative colitis.
Prior to our acquisition, PONVORY was tested in patients with psoriasis and demonstrated significant effects in both induction and maintenance of response. If approved in this indication, PONVORY will be the first oral sphingosine1-phosphate analog in treating psoriasis and would significantly expand the addressable patient population of PONVORY with over 8 million people diagnosed with psoriasis in the U.S. alone.
Additionally, this class of drugs has proven to be effective in treating ulcerative colitis, where PONVORY with its differentiated profile could have a competitive advantage and significantly expand the addressable patient population with an estimated prevalence in the U.S. of approximately 2 million individuals with ulcerative colitis.
Our vision is to increase awareness for PONVORY is an option for patients with multiple sclerosis in need of a specific and versatile agent. In addition, we intend to exploit the application of PONVORY in a host of autoimmune disorders in which its mechanism of action could be therapeutically desirable.
Finally, an update on tradipitant. Tradipitant, our neurokinin-1 receptor antagonist is currently being developed for the treatment of gastroparesis with a New Drug Application under review by the FDA and an expected target action date in September of 2024. Gastroparesis prevalence is estimated to be over 6 million individuals in the U.S., and there has been no approved treatment in over 40 years.
In addition to the FDA review, a clinical study is ongoing with over 600 patients to examine the safety and the exposure response relationship of tradipitant in patients with gastroparesis. Close to 40 people have also been approved for treatment in the expanded access program with some of them have now been treated for duration in excess of 2 years.
Approval in this indication, gastroparesis, [indiscernible] will address a serious unmet medical need and bring a new therapeutic option to these patients for the first time in over 40 years. Tradipitant is also now completing the clinical program studying its effects in motion sickness, with an NDA filing expected by year-end. Results from the second and final Phase III clinical study are expected in the coming months.
The efficacy of tradipitant motion sickness has previously been demonstrated in two clinical studies where tradipitant was effective in preventing vomiting associated with motion, in traveling in the coastal waters of the United States. An eventual approval for this indication is received will significantly expand the addressable patient population with approximately 30% of the U.S. population reported to suffer from motion sickness under ordinary travel conditions that include sea, air and land.
Our vision is to evaluate and commercialize tradipitant for a host of indications, including gastroparesis, motion sickness and other disorders where this mechanism of action is desirable. Vanda also has earlier clinical programs which seek to address unmet medical needs for common and rare disorders ranging from dry eye, performance anxiety and onychomycosis to polycythemia vera and sarcomere to disease.
We have been able to accomplish all this with a small but efficient organization that is enthusiastic to continue developing and commercializing treatments for people who need them. We expect several significant milestones in the coming months, including the launch of Fanapt in bipolar I disorder, the launch of PONVORY in multiple sclerosis, the potential approval of tradipitant in gastroparesis, the Phase III results of tradipitant in motion sickness, the upcoming NDA filings of milsaperidone in psychiatric disorders and tradipitant motion sickness and the initiation of clinical programs in depression, psoriasis, ulcerative colitis and pediatric insomnia. We are confident that our robust revenue, strong cash position and efficient operations position us well for significant growth and value creation in the years to come.
Before I turn to Kevin to walk you through our business and financial performance for the quarter, I want to take a minute to cover some other recent developments at Vanda. Yesterday, we issued a press release announcing that we are in receipt of a revised unsolicited takeover proposal. The Board and management team are dedicated to act in the best interest of our shareholders, and we would consider any ideas that would drive long-term shareholder value.
To that end, our Board of Directors, alongside our independent financial and legal advisers is in the process of reviewing and evaluating this revised unsolicited proposal. We will not comment further on this unsolicited takeover proposal before the Board has completed its review.
With that, I'll turn now to Kevin to discuss our financial results. Kevin?