Dermavant Showcases New Long-Term Data from Phase 3 PSOARING 3 Trial of Tapinarof in Patients with Plaque Psoriasis at the 30th EADV Virtual Congress

LONG BEACH, Calif., & BASEL, Switzerland--(BUSINESS WIRE)-- Dermavant Sciences, a clinical-stage biopharmaceutical company dedicated to developing and commercializing innovative therapeutics in immuno-dermatology, today announced final results from the Phase 3 PSOARING 3 long-term extension study of its investigational product tapinarof, a 1% once daily, non-steroidal topical cream for the treatment of plaque psoriasis in adults. The study results demonstrated that tapinarof cream was well tolerated long term, with a safety profile consistent with the pivotal studies and previously reported interim analysis of data from PSOARING 3. In addition, in the study tapinarof demonstrated a high rate of complete disease clearance, a median remittive effect off-therapy for approximately four months for patients entering with a PGA score of 0, durability of response for up to 52 weeks, and consistent efficacy regardless of intermittent treatment based on PGA response during the study. The data were presented during a Late-Breaking Session at the 30th European Academy of Dermatology and Venereology (EADV) Virtual Congress.

“For the millions of people living with plaque psoriasis, the chronic nature of the condition has both physical and emotional impacts, leaving many looking for additional treatment options,” said Bruce Strober, MD, PhD, Clinical Professor of Dermatology at Yale University School of Medicine, and lead investigator for the PSOARING 3 study. “These consistent PSOARING 3 safety and efficacy results suggest that, subject to FDA approval, tapinarof could be an important new topical treatment option for this debilitating condition.”

Eligible patients completing PSOARING 1 or 2, which were 12-week pivotal studies of tapinarof in adults with plaque psoriasis, could enroll in PSOARING 3, which comprised an additional 40 weeks of open-label treatment followed by a 4-week follow-up. Subjects who received tapinarof treatment during PSOARING 1 or 2 and completed PSOARING 3 received treatment for up to 52 weeks. PSOARING 3, which enrolled 763 patients, was designed to assess the safety and real-world use of tapinarof, and included prespecified analyses of duration of remittive effect off-therapy (defined as off-therapy maintenance of a PGA score of 0 or 1) and durability of response on-therapy. Outcomes were based on Physician Global Assessment (PGA) scores. Results from a planned interim analysis of data from PSOARING 3 were previously announced in February 2021.

Efficacy Data

• 58.2% (302/519) of patients who entered the PSOARING 3 study with a PGA score ≥2 achieved a PGA score of 0 or 1, demonstrating tapinarof's continued improvement in efficacy beyond the 12-week pivotal studies.
• 40.9% (312/763) of all patients achieved complete disease clearance (PGA score of 0).
• Remittive effect, which was defined as off-therapy maintenance of a PGA score of 0 or 1, was observed in the study:
  • Median duration of remittive effect off-therapy was 115 days (approximately 4 months) for patients entering the study with a PGA score of 0 (n=79).
  • Among patients entering the study with or achieving a PGA score of 0 (n=312), the mean duration of remittive effect off-therapy was 130 days.
  • Durability of response, which was defined as no tachyphylaxis over time, was demonstrated for up to 52 weeks.

“With a high rate of complete disease clearance, a 4-month median remittive effect for patients entering with a PGA score of 0, and durable response with long-term use demonstrated in the PSOARING 3 study, the data for tapinarof continues to impress me over time,” said Linda Stein Gold, MD, Director of Dermatology Clinical Research at Henry Ford Health System, and PSOARING 3 study investigator. “As a clinician, I am excited about these final results from PSOARING 3 and the potential for tapinarof to be a new therapy for patients suffering from plaque psoriasis.”

Safety Data

• Treatment-emergent adverse events (TEAEs) were consistent with those from the interim analysis of data from PSOARING 3 and from the PSOARING 1 and 2 trials, with no new safety signals observed with long-term use.
• TEAEs were mostly mild to moderate, at application sites, and associated with a low discontinuation rate (5.4%).
• Incidence and severity of folliculitis and contact dermatitis remained stable with long-term use and were associated with low discontinuation rates (1.2% and 1.4%, respectively).

Results from the interim analysis of PSOARING 3, along with results from the previously reported Phase 3 PSOARING 1 and PSOARING 2 trials, served as the basis for the New Drug Application that Dermavant submitted to the U.S. Food and Drug Administration (FDA) in May 2021. The FDA accepted the application and assigned a Prescription Drug User Fee Act target action date in Q2 2022.

“We are excited to offer a more detailed picture at EADV of the long-term efficacy and safety profile of tapinarof in PSOARING 3,” said Philip M. Brown, MD, J.D., Chief Medical Officer of Dermavant. “We look forward to engaging with the FDA on our NDA in due course, as we work to bring tapinarof to plaque psoriasis patients as expeditiously as possible.”

About Dermavant’s Phase 3 Program for Tapinarof in Psoriasis

Dermavant’s pivotal Phase 3 clinical program for tapinarof in adult plaque psoriasis consists of PSOARING 1 (NCT03956355) and PSOARING 2 (NCT03983980), as well as PSOARING 3 (NCT04053387), a long-term extension study.

PSOARING 1 and PSOARING 2, which collectively enrolled 1,025 patients, were two identically designed, multi-center, randomized, vehicle-controlled, double-blind, parallel group studies conducted in North America that evaluated the safety and efficacy of tapinarof cream, 1% dosed once daily (QD) for 12 weeks versus vehicle QD in adult patients aged 18-75 years diagnosed with plaque psoriasis. The primary endpoint of both studies was the proportion of patients who achieved a PGA score of clear (0) or almost clear (1) with a minimum 2-grade improvement from baseline at Week 12.

PSOARING 3 was a long-term, open-label, extension study to evaluate the safety and efficacy of tapinarof cream, 1% for the treatment of plaque psoriasis in adults. Patients in the study had previously completed treatment with tapinarof or vehicle in either the PSOARING 1 or PSOARING 2 Phase 3 pivotal efficacy and safety studies. PSOARING 3 consisted of up to 40 weeks of tapinarof cream, 1%, and a 4-week safety follow-up period. As such, patients who received drug during PSOARING 1 and PSOARING 2 and completed PSOARING 3 received treatment with tapinarof cream for up to 52 weeks. Greater than 90% of eligible patients who completed PSOARING 1 and PSOARING 2 enrolled in PSOARING 3. Dermavant released interim analysis results from PSOARING 3 in February 2021 and the study completed on April 5, 2021.

About Psoriasis

Psoriasis is a chronic, systemic, inflammatory skin disease characterized by red patches and plaques with silvery scales on the skin. Psoriasis affects approximately 8 million people in the United States and 125 million worldwide.

Psoriasis can begin at any age, but typically has two peaks of onset, the first at age 20 to 30 years and the second at age 50 to 60 years. People with psoriasis are at an increased risk of developing other chronic and serious health conditions. Comorbidities include psoriatic arthritis, inflammatory bowel disease, hypertension, diabetes, obesity, and depression. Psoriasis has a significant impact on quality of life and on psychological health.

About Dermavant

Dermavant Sciences, a subsidiary of Roivant Sciences, is a clinical-stage biopharmaceutical company dedicated to developing and commercializing innovative therapeutics in immuno-dermatology. Dermavant’s focus is to develop therapies that have the potential to address high unmet medical needs while driving greater efficiency in research and clinical development. The company’s robust medical dermatology pipeline includes both late-stage and earlier-stage-development product candidates the company believes could address important immuno-dermatological conditions, including psoriasis, atopic dermatitis, vitiligo, primary focal hyperhidrosis, and acne. Tapinarof is a novel, therapeutic aryl hydrocarbon receptor modulating agent, in development as a once-daily, steroid-free and cosmetically elegant topical cream for the treatment of plaque psoriasis and atopic dermatitis, which affect approximately 8 million and 26 million people in the United States, respectively. The company has reported positive Phase 3 results for tapinarof cream in adult patients with plaque psoriasis, and has initiated a Phase 3 program in atopic dermatitis in patients aged 2 years and older. For more information, please visit www.dermavant.com, and follow us on Twitter (@dermavant) and LinkedIn (Dermavant Sciences).

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