Soligenix Begins its Pivotal Phase 3 Clinical Trial

Soligenix Begins its Phase 3 Clinical Trial of SGX301 for the Treatment of Cutaneous T-Cell Lymphoma          (This article is from 12-14-15)

— Soligenix, Inc. (OTCQB: SNGX) (Soligenix or the Company), a late-stage biopharmaceutical company focused on developing and commercializing products to treat rare diseases where there is an unmet medical need. It announced today that patient enrollment has been opened for its Phase 3, multicenter, randomized, double-blind, placebo-controlled study evaluating SGX301 (synthetic hypericin), as a treatment for cutaneous T-cell lymphoma (CTCL). SGX301 has previously been granted both orphan drug and fast track designations from the US Food and Drug Administration (FDA) for the first-line treatment of CTCL. CTCL is a rare disease and a class of non-Hodgkin’s lymphoma, a type of cancer of the white blood cells that are an integral part of the immune system.

Soligenix has been working with leading CTCL centers, as well as with the National Organization for Rare Disorders (NORD) and the Cutaneous Lymphoma Foundation (CLF) to initiate this pivotal Phase 3 clinical trial with SGX301, referred to as the FLASH study (Fluorescent Light Activated Synthetic Hypericin), that will enroll 120 evaluable subjects.

SGX301 is a novel, first-in-class, photodynamic therapy that combines synthetic hypericin, a potent photosensitizer that is applied to the cancerous skin lesions and activated using a brief safe, fluorescent light treatment. This treatment approach avoids the risk of secondary malignancies (including melanoma) inherent with the frequently employed DNA-damaging chemotherapeutic drugs and other photodynamic therapies that are dependent on ultraviolet exposure. Topical hypericin has demonstrated safety in a Phase 1 clinical study in healthy volunteers. In a Phase 2, double-blind, placebo-controlled clinical study in CTCL patients, the drug was safe and well tolerated, with 58.3% of the CTCL patients responding to SGX301 treatment compared to only 8.3% receiving placebo (p ≤ 0.04).

“I enthusiastically support Soligenix in their efforts to improve outcomes for patients with CTCL, affecting up to 50,000 patients in the US,” stated Alain Rook, MD, Director, Cutaneous Lymphoma Program, Hospital of the University of Pennsylvania. “I have been working closely with the Soligenix team on this Phase 3 clinical program and I am pleased it is now open to enroll patients. I believe that SGX301 has the potential to be a major step forward in the treatment of CTCL by providing a safer alternative therapy over the course of the patients’ disease than is currently available.”

“The initiation of the Phase 3 trial marks an important step in the development of SGX301 as a treatment for CTCL,” stated Christopher J. Schaber, PhD, President and Chief Executive Officer of Soligenix. “We are excited to be working with many experienced clinicians as well as with NORD and CLF, as we look to enroll in this pivotal study in an effort to address the significant unmet medical need in this orphan disease.”

Based on the positive results demonstrated in the Phase 2 study of SGX301, the Phase 3 protocol will be a highly powered, double-blind, randomized, placebo-controlled, multicenter trial and will seek to enroll 120 evaluable subjects. The trial will consist of three treatment cycles, each of 8 weeks duration. Treatments will be administered twice weekly for the first 6 weeks and treatment response will be determined at the end of Week 8. In the first treatment cycle, approximately 80 subjects will receive SGX301 and 40 will receive placebo treatment of their index lesions. In the second cycle, all subjects will receive SGX301 treatment of their index lesions and in the third cycle all subjects will receive SGX301 treatment of all their lesions. Subjects will be followed for an additional 6 months after the completion of treatment. The primary efficacy endpoint will be assessed on the percent of patients in each of the two treatment groups (i.e., SGX301 and placebo) achieving a Partial or Complete Response (yes/no) of the treated lesions defined as a ≥ 50% reduction in the total Composite Assessment of Index Lesion Disease Severity (CAILS) score for 3 index lesions at the Cycle 1 evaluation visit (Week 8) compared to the total CAILS score at baseline. Other secondary measures will assess treatment response (including duration), degree of improvement, time to relapse and safety. The study is anticipated to complete enrollment with primary data available in the second half of 2016.