On September 21, 2021 Zenith Epigenetics Ltd. ("Zenith" or the "Company") and Newsoara BioPharma Co., Ltd. ("Newsoara") reported the initiation of a multi-national, randomized Phase 2b clinical trial testing the combination of ZEN-3694, a leading BET bromodomain inhibitor (BETi), with Astellas Pharma Inc. ("Astellas") and Pfizer’s androgen receptor signaling inhibitor (ARSI), enzalutamide, in patients with mCRPC who had a poor response to prior abiraterone treatment (Press release, Zenith Epigenetics, SEP 21, 2021, View Source [SID1234590199]). The study will evaluate the efficacy of ZEN-3694 + enzalutamide vs. single agent enzalutamide as measured by its primary endpoint, radiographic free progression.
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Abiraterone, also an ARSI, is frequently prescribed as a first line therapy for patients with metastatic prostate cancer. A significant fraction of these patients, whose tumors have low androgen receptor (AR) signaling activity, have a sub optimal response to abiraterone and their subsequent treatment options are limited to cytotoxic therapies. The rationale for this study design is supported by a recent publication in Clinical Cancer Research whose authors uncovered a potential mechanism explaining the role of BETi in sensitizing tumors with low AR signaling to ARSI by blocking a treatment-emergent neuroendocrine differentiation program. This mechanistic study built on a previous clinical trial conducted by Zenith where results suggested that ZEN-3694 + enzalutamide was most active in mCRPC patient tumors who had the lowest AR activity. Furthermore, patients in that trial that had a poor response to prior abiraterone therapy had the most durable response with ZEN-3694 + enzalutamide.
"We are delighted to initiate this study in collaboration with our partners Newsoara and Astellas to continue the development of ZEN-3694 in mCRPC patients," said Donald McCaffrey, President and Chief Executive Officer of Zenith. "We are pursuing a novel approach of treating mCRPC patients whose tumors are resistant to ARSI. Other therapies, either approved or in development, are either cytotoxic or mainly target AR signaling which resistant tumors are no longer dependent on," Mr. McCaffrey further commented.
Dr. Benny Li, Chief Executive Officer of Newsoara added, "with promising data from the completed Phase 1b/2a trial, the initiation of the multi-national, randomized Phase 2b clinical study in patients with mCRPC is a significant milestone for us to pursue a novel treatment through our partnership with Zenith."
About Prostate Cancer
Prostate cancer is the second-most commonly diagnosed cancer among men and the fifth most common cause of male cancer death worldwide. Adenocarcinoma of the prostate is dependent on androgen for tumor progression and depleting or blocking androgen action has been a mainstay for over six decades. Although tumors are often initially sensitive to medical or surgical therapies that decrease levels of testosterone and to ARSIs that block AR signaling, disease progression ultimately occurs leading to mCRPC. The treatment of prostate cancer patients has evolved rapidly over the past ten years with second generation ARSIs. Despite these advances, many patients with mCRPC fail or develop resistance to existing treatments, leading to continued disease progression and limited survival rates.