Onconova Announces First Patient Dosed In Investigator-Initiated Phase 2 Study Of Rigosertib In Recessive Dystrophic Epidermolysis Bullosa-Associated Squamous Cell Carcinoma

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NEWTOWN, Pa., April 22, 2021 (GLOBE NEWSWIRE) — Onconova Therapeutics, Inc. (NASDAQ: ONTX), a clinical-stage biopharmaceutical company focused on discovering and developing novel products for patients with cancer, announced today that the first patient has been dosed in an investigator-initiated Phase 2 study to assess the efficacy and safety of rigosertib in patients with recessive dystrophic epidermolysis bullosa (RDEB)-associated locally advanced/metastatic squamous cell carcinoma (SCC). The patient was dosed at the EB House Austria, a center of expertise for epidermolysis bullosa at the University Hospital Salzburg, Austria. Additional sites are anticipated to be opened in the UK and in the US to study this rare and genomically driven devastating disease.

In this open-label investigator-initiated study, 12 patients will receive either oral or intravenous rigosertib at the clinician’s discretion given the various clinical manifestations of the disease, which may dictate the need for either oral or intravenous administration of rigosertib. These patients have skin desquamation making intravenous access difficult, or may form esophageal strictures, which make oral administration difficult. Patients will receive either oral rigosertib in four-week cycles (three weeks on, one week off) for up to 13 cycles, with 560 mg of oral rigosertib in the morning and again in the afternoon, for a total of 1,120 mg/day. Alternatively, patients will receive intravenous (IV) rigosertib as a 72-hour IV infusion on days 1, 2 and 3 of eight 2-week cycles, and on days 1, 2 and 3 of nine 4-week cycles thereafter, with each 24-hour infusion consisting of 1,800 mg of rigosertib.

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