Trovagene Inc. issued the following announcement on Feb. 14.
Trovagene, Inc. (Nasdaq: TROV), a clinical-stage oncology therapeutics company, taking a precision medicine approach to develop drugs that target cell division (mitosis) for the treatment of leukemias, lymphomas and solid tumor cancers, today presented an overview of its ongoing Phase 2 study evaluating Onvansertib in combination with Zytiga® (abiraterone acetate)/prednisone in patients with metastatic Castration-Resistant Prostate Cancer (mCRPC) at the Genitourinary Cancers Symposium (ASCO-GU) in San Francisco, CA.
The data, featured in a poster presentation at the Genitourinary Cancers Symposium (ASCO-GU), demonstrates the safety and tolerability of Onvansertib in combination with Zytiga®, confirmed in the safety lead-in that was completed prior to opening the trial to full enrollment. In addition, a second arm is planned with the goal of maximizing clinical activity by reducing the dosing schedule from the current 21-days to 14-days.
"We are pleased with the progress we are making in our Phase 2 mCRPC trial and to having our lead investigator, Dr. David Einstein, of Beth Israel Deaconess Medical Center, present the poster at the ASCO-GU conference today," said Dr. Thomas Adams, Chief Executive Officer and Chairman of Trovagene. "There are limited options, other than intensive chemotherapy which has a poor prognosis, in patients who are showing initial signs of resistance to treatment with Zytiga®. The objective of our trial is to demonstrate clinical benefit by lowering or stabilizing levels of prostate specific antigen (PSA) with the combination of onvansertib and Zytiga®. We believe the combination regimen may provide a much-needed new therapeutic option for these patients."
Details of the poster presentation are provided below:
Title: A Phase 2 Study of Onvansertib (PCM-075) in Combination with Abiraterone and Prednisone in Patients with Metastatic Castration-Resistant Prostate Cancer
Session Name: Trials in Progress Poster Session A: Prostate Cancer
Location: Moscone West Building - Poster Board N12 - Abstract TPS336
Date and Time: Thursday, February 14, 2019: 11:30 AM - 1:00 PM and 5:30 PM - 6:30 PM
- Polo-like Kinase 1 (PLK1):
- Serine/threonine kinase, master regulator of cell-cycle progression
- Overexpressed in prostate cancer
- Androgen Receptor (AR) and PLK1 regulate each other
- PLK1 synergy with Zytiga® (abiraterone acetate) identified in a novel in-vivo castration-resistant prostate cancer (CRPC) model
- Onvansertib (also known as PCM-075 and NMS-1286937):
- Orally-bioavailable, highly-selective PLK1 inhibitor
- ~24-hour half-life
- Induces G2/M arrest and apoptosis in cancer cells, including prostate cancer
- Safe and well tolerated
- Recommended Phase 2 dose established
- Safety and tolerability confirmed in safety lead-in patients; no overlapping toxicities; trial fully enrolling
- Observe effects of onvansertib in combination with Zytiga on disease control rate (Prostate Specific Antigen [PSA] decline of stabilization in patients with mCRPC and early resistance to Zytiga
About the Ongoing Onvansertib Phase 2 Trial in mCRPC
In this multi-center, open-label, Phase 2 trial, Onvansertib in combination with the standard dose of Zytiga® (abiraterone acetate) and prednisone, all administered orally, is being evaluated for safety and efficacy. The trial will enroll up to 45 patients with mCRPC showing early signs of disease progression demonstrated by two rising PSA values separated by at least one week, while on Zytiga®/prednisone therapy. The primary efficacy endpoint is the proportion of patients achieving disease control after 12 weeks of study treatment, as defined by lack of prostate specific antigen (PSA) progression in patients who are showing signs of early progressive disease (rise in PSA but minimally symptomatic or asymptomatic) while currently receiving abiraterone acetate and prednisone (NCT03414034). The trial is being conducted at Beth Israel Deaconess Medical Center (BIDMC), Dana Farber Cancer Institute (DFCI) and Massachusetts General Hospital (MGH).
Onvansertib is a first-in-class, 3rd generation, oral and highly-selective adenosine triphosphate (ATP) competitive inhibitor of the serine/threonine polo-like-kinase 1 (PLK 1) enzyme, which is over-expressed in multiple cancers, including leukemias, lymphomas and solid tumors. Separate studies with other PLK inhibitors have shown that inhibition of polo-like-kinases can lead to tumor cell death, including a Phase 2 study in Acute Myeloid Leukemia (AML) where response rates of up to 31% were observed when combined with a standard therapy for AML (low-dose cytarabine-LDAC) versus treatment with LDAC alone with a 13.3% response rate. A Phase 1 open-label, dose escalation safety study of Onvansertib has been completed in patients with advanced metastatic solid tumor cancers and published in Investigational New Drugs. The maximum tolerated dose (MTD) or recommended Phase 2 dose (RP2D) in this trial was 24 mg/m2. Trovagene has an ongoing Phase 1b/2 clinical trial with onvansertib in AML that was accepted by the National Library of Medicine (NLM) and is now publicly viewable on www.clinicaltrials.gov. The NCT number assigned by clinicaltrials.gov for this study is NCT03303339. Onvansertib has been granted Orphan Drug Designation by the FDA in the U.S. and by the EC in the European Union (EU) for the treatment of patients with AML.
Onvansertib targets the PLK1 isoform, only (not PLK2 or PLK3), is orally administered, has a 24-hour drug half-life with only mild to moderate side effects reported. Trovagene believes that targeting only PLK1 and having a favorable safety and tolerability profile, along with an improved dose/scheduling regimen will significantly improve on the outcome observed in previous studies with a former panPLK inhibitor in AML.
Onvansertib has demonstrated synergy in preclinical studies with numerous chemotherapies and targeted therapeutics used to treat leukemias, lymphomas and solid tumor cancers, including FLT3 and HDAC inhibitors, taxanes, and cytotoxins. Trovagene believes the combination of its targeted PLK1 inhibitor, onvansertib, with other compounds has the potential to improve clinical efficacy in Acute Myeloid Leukemia (AML), metastatic Castration-Resistant Prostate Cancer (mCRPC), Non-Hodgkin Lymphoma (NHL), Colorectal Cancer, Triple Negative Breast Cancer (TNBC), as well as other types of cancer.
Original source can be found here.