On March 10, 2021 Cardiff Oncology, Inc. (Nasdaq: CRDF), a clinical-stage biotechnology company developing drugs to treat cancers with the greatest medical need for new treatment options, including KRAS-mutated colorectal cancer, pancreatic cancer, castrate-resistant prostate cancer and leukemias, reported the publication of two abstracts that will be presented as electronic posters during Week 1 of the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2021, taking place virtually from April 10-15, 2021 (Press release, Cardiff Oncology, MAR 10, 2021, View Source [SID1234576440]).
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Details on the electronic posters and corresponding abstracts are shown below.
Title: Expanded access program of the PLK1 inhibitor onvansertib for treatment of patients with KRAS-mutant metastatic colorectal cancer
Session Type: E-Poster Session
Session Category: Clinical Research (Excluding Trials)
Session Title: Clinical Outcomes Research
Abstract Number: 425
This abstract includes findings from Cardiff Oncology’s Expanded Access Program (EAP) for onvansertib in KRAS-mutated metastatic colorectal cancer (mCRC). The findings show that of the 13 patients with a KRAS mutation detected in circulating tumor DNA (ctDNA) at baseline, 8 had a decrease of greater than 50% in KRAS mutant allelic frequency (MAF) following two treatment cycles of onvansertib (15 mg/m2, Days 1 to 5 of a 14-day cycle) in combination with FOLFIRI and bevacizumab (Day 1 of each cycle). Additional observations regarding clinical benefit and correlations between KRAS MAF and treatment response will be featured as part of the upcoming electronic poster presentation at the AACR (Free AACR Whitepaper) annual meeting.
Title: The selective polo-like kinase (Plk1) inhibitor onvansertib and the antiandrogen abiraterone synergistically kill cancer cells through disruption of mitosis independently of androgen receptor signaling
Session Type: E-Poster Session
Session Category: Experimental and Molecular Therapeutics
Session Title: Cell Cycle Mechanisms of Anticancer Drug Action
Abstract Number: 973
This abstract describes preclinical studies that aim to identify the mechanisms driving onvansertib-abiraterone synergy by treating prostate cancer cell lines showing, or not showing, synergy between these drugs with vehicle, abiraterone, enzalutamide, or onvansertib prior to RNA sequencing and Gene Set Variation Analysis (GSVA). In synergistic cells, a group of mitosis and mitotic spindle related gene sets were significantly upregulated by both abiraterone and onvansertib. These gene sets were not upregulated in non-synergistic cells, or by enzalutamide, indicating that abiraterone may target mitosis related genes or processes in an androgen receptor-independent manner. Data also suggested that baseline differences in mitotic arrest and spindle assembly checkpoint dependent cell death pathways may be predictive of synergy and patient response to the onvansertib-abiraterone combination. This hypothesis is currently being evaluated in an ongoing Phase 2 trial evaluating the all-oral regimen of onvansertib, abiraterone and prednisone in metastatic castrate-resistant prostate cancer patients showing initial abiraterone resistance.
The full texts of the published abstracts are currently available on the AACR (Free AACR Whitepaper) Annual Meeting 2021 website. The corresponding posters will be available for on-demand viewing on the AACR (Free AACR Whitepaper) Annual Meeting 2021 e-poster website starting at 8:30 am ET on April 10, 2021 and will also be posted to the "Scientific Presentations" section of the Cardiff Oncology website at View Source
About the Phase 2 Trial of Onvansertib in Metastatic Castrate-Resistant Prostate Cancer
This trial is a Phase 2 open-label study of onvansertib in combination with abiraterone and prednisone, all administered orally, in patients with metastatic castration-resistant prostate cancer showing signs of early progressive disease (demonstrated by two rising prostate-specific antigen values separated by at least one week with no or minimal symptoms) 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 a lack of prostate-specific antigen (PSA), radiographic, or symptomatic progression. The trial is being conducted by Beth Israel Deaconess Medical Center (BIDMC), Dana-Farber Cancer Institute (Dana-Farber), and Massachusetts General Hospital Cancer Center (MGH). David Einstein, M.D., Genitourinary Oncology Program at BIDMC, is the principal investigator for the trial. For more information on the trial, please visit View Source
About the Expanded Access Program (EAP) for Onvansertib in KRAS-mutated mCRC
Sometimes called "compassionate use", expanded access is a potential pathway for a patient with a serious or life-threatening disease to gain access to an investigational drug for treatment outside of a clinical trial, particularly when no comparable or satisfactory alternative therapy options are available. The Cardiff Oncology EAP in KRAS-mutated mCRC is using the same combination treatment regimen (onvansertib 15 mg/m2 + FOLFIRI/bevacizumab) and dosing schedule as the ongoing Phase 1b/2 clinical trial and is intended for patients that have progressed on prior therapy and do not meet the eligibility criteria for enrollment in the clinical trial. For more information on the expanded access program, please visit View Source