Sirnaomics Accelerates Clinical Development of STP705 for isSCC, BCC

February 1, 2023

STP705 utilizes two short segments of RNA, known as short interfering, or silencing RNA (siRNA), to defeat proteins involved in the progression of certain diseases.

Sirnaomics Ltd. is advancing the clinical development of STP705 for the treatment of squamous cell carcinoma in situ (isSCC) and basal cell carcinoma (BCC).

 Based on positive clinical readouts from a Phase IIb study for isSCC and a Phase II study for BCC, Sirnaomics is formulating a communication package for the U.S. Food and Drug Administration (FDA) to seek guidance for conducting a late-stage clinical development for the treatment of isSCC and BCC. 

Additionally, the Company has developed a commercialization plan to position STP705 when upcoming clinical studies reach primary endpoints.

An interim report in December 2022 in respect of the Phase IIb study of STP705 for the treatment of isSCC showed that the majority (78%) of the 32 patients treated with STP705 achieved histological clearance, the primary endpoint of the study. One out of the three treatment cohorts achieved 89% histological clearance. The positive results further validated STP705 as a novel siRNA (small interfering RNA) therapeutic, taking advantage of a dual-targeted inhibitory property and a polypeptide nanoparticle (PNP)-enhanced delivery to directly knock down both TGF-β1 and COX-2 gene expressions.

In August 2022, the Company reported that the Phase II clinical study of STP705 in five patients with BCC showed an optimal clinical dosage of 180µg and achieved a 100% histological clearance and completed response (CR), indicating the potential viability of the treatment. Apart from achieving a 100% CR, the data in this cohort showed improved or stable cosmetic results with an excellent safety profile and no significant cutaneous skin reactions. The success of BCC treatment with STP705 further validated the potential for the treatment of non-melanoma conditions.

"In our clinical studies for STP705 to date, we have achieved significant efficacy and a strong safety profile," says Dr. Michael Molyneaux, M.D., Executive Director and Chief Medical Officer of Sirnaomics, in a news release. "As we continue to study this promising therapeutic candidate, we will further confirm the most effective dose and the therapeutic benefits for the treatment of isSCC, SCC and BCC. Those non-melanoma skin cancers are affecting millions of people in the United States and globally. Currently, there are only a small number of approved non-surgical treatments. We have formulated a marketing and launch strategy for using our injectable treatment approach to compensate the shortcoming of the surgical treatment."

"The latest results from the Phase IIb study of isSCC and Phase II study of BCC has shown efficacy of STP705 without any drug related Adverse Events (AEs) and Serious Adverse Events (SAEs), validating the broad potential of STP705 for treatment of non-melanoma skin cancers," adds Dr. Patrick Lu, Founder, Chairman of the Board, Executive Director, President and CEO of Sirnaomics. "With guidance from the FDA, Sirnaomics is confident to move our lead drug candidate into later-stage clinical development to further explore and evaluate the great potential of STP705 for the treatment of non-melanoma skin cancers."

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