Androgen deprivation therapy (ADT), a cornerstone of prostate cancer treatment, is commonly co-prescribed as combination therapy.
To better understand the safety and tolerability profile of relugolix, an oral non-peptide gonadotropin-releasing hormone (GnRH) receptor antagonist, in combination with abiraterone acetate (abiraterone) and apalutamide, a phase I study was undertaken.
This is an ongoing, 52-week, open-label, parallel cohort study of relugolix in combination with abiraterone in men with metastatic castration-sensitive prostate cancer (mCSPC) or metastatic castration-resistant prostate cancer (mCRPC) [Part 1] and apalutamide in men with mCSPC or non-metastatic castration-resistant prostate cancer (nmCRPC) [Part 2]. Eligible patients treated with leuprolide acetate or degarelix with abiraterone or apalutamide prior to baseline, at which time they were transitioned to relugolix. Assessments included reporting of adverse events, clinical laboratory tests, vital sign measurements, electrocardiogram (ECG) parameters, and testosterone serum concentrations. In this interim report, patients completing ≥12 weeks were included.
Overall, 15 men were enrolled in Part 1 and 10 in Part 2. Adverse events were mostly mild-to-moderate in intensity and were consistent with the known safety profiles of the individual medications. No transition (from prior ADT treatment)- or time-related trends in clinical laboratory tests, vital sign measurements, or ECG parameters were observed. Mean testosterone concentrations remained below castration levels.
Combination therapy of relugolix and abiraterone or apalutamide was associated with a favorable safety and tolerability profile consistent with the known profiles of the individual medications. Castration levels of testosterone were maintained after transitioning to relugolix from other ADTs.
ClinicalTrials.gov identifier: NCT04666129.
Targeted oncology. 2023 Apr 15 [Epub ahead of print]
Jose De La Cerda, Curtis Dunshee, Lawrence Gervasi, Paul Sieber, Laurence Belkoff, Ronald Tutrone, Sophia Lu, Sergio C Gatoulis, Bruce Brown, Elizabeth Migoya, Neal Shore
Urology San Antonio, 3327 Research Plaza Suite 403, San Antonio, TX, 78235, USA. ., Arizona Urology Specialists, Tucson, AZ, USA., SouthWest Urology LLC, Middleburg Heights, OH, USA., Urological Associates of Lancaster, Lancaster, PA, USA., Division of Urology, MidLantic Urology/Main Line Health, Bala Cynwyd, PA, USA., Chesapeake Urology, Towson, MD, USA., Myovant Sciences, Inc., Brisbane, CA, USA., Pfizer Inc., New York, NY, USA., Carolina Urologic Research Center, Myrtle Beach, SC, USA.
PubMed http://www.ncbi.nlm.nih.gov/pubmed/37060432