Palvella Therapeutics Announces Positive Topline Results from Phase 2 TOIVA Clinical Trial of QTORIN™ 3.9% Rapamycin Anhydrous Gel (QTORIN™ rapamycin) for the Treatment of Cutaneous Venous Malformations, a Serious, Rare Genetic Disease with No FDA-approved Therapies

73% of trial participants (11/15 participants) improved on the Overall Cutaneous Venous Malformations Investigator Global Assessment (Overall cVM-IGA) at Week 12; 67% of trial participants (10/15 participants) rated as “Much Improved” (+2) or “Very Much Improved” (+3) on the Overall cVM-IGA at Week 12

Achieved statistical significance on multiple pre-specified clinician-reported and patient-reported efficacy endpoints, including dynamic change endpoints and static severity endpoints

QTORIN™ rapamycin was generally well-tolerated, with no drug-related serious adverse events reported

Based on Phase 2 results, Palvella to pursue near-term discussions with FDA regarding the potential for Breakthrough Therapy Designation and a Phase 3 pivotal study; FDA previously granted Fast Track Designation to QTORIN™ rapamycin for venous malformations

QTORIN™ rapamycin has the potential to become the first FDA-approved therapy and standard of care for the estimated more than 75,000 individuals with cutaneous venous malformations in the U.S.

Excerpt from the Press Release:

WAYNE, Pa., Dec. 15, 2025 (GLOBE NEWSWIRE) — (Nasdaq: PVLA) Palvella Therapeutics, Inc. (Palvella or “the Company”), a clinical-stage biopharmaceutical company focused on developing and commercializing novel therapies to treat patients suffering from serious, rare skin diseases for which there are no U.S. Food and Drug Administration (FDA)-approved therapies, today announced positive topline results from the Company’s Phase 2 TOIVA study of QTORIN™ 3.9% rapamycin anhydrous gel (QTORIN™ rapamycin) for the treatment of cutaneous venous malformations (cutaneous VMs).

“Based on the large magnitude of the treatment effect observed in the majority of patients in the Phase 2 TOIVA study, QTORIN™ rapamycin has potential to become first-line therapy and to establish a much-needed standard of care for individuals living with cutaneous venous malformations,” said Megha Tollefson, M.D., pediatric dermatologist at Mayo Clinic and Principal Investigator of the Phase 2 TOIVA study. “Cutaneous venous malformations are congenital, chronic, progressive lesions that persist throughout life and can have a profound impact on patients’ quality of life. They may affect functionally critical areas of the body, often leading to daily discomfort, limitations in activities, and substantial burden for patients and their families. Current procedure-based approaches can be painful, ineffective, or both, and result in high rates of recurrence. Taken together, we believe the Phase 2 data represent a milestone day for individuals living with cutaneous venous malformations, and we look forward to working with Palvella to advance development of this therapy for patients as quickly as possible.”

TOIVA is a Phase 2, single-arm, open-label, baseline-controlled clinical trial of QTORIN™ rapamycin administered topically once daily for a 12-week efficacy evaluation period followed by a 12-week treatment extension period, for cutaneous VMs.

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