Canada: The Society for Gynecologic Oncology of Canada lists all ongoing and upcoming Canadian gynecological clinical trials.
United States: The National Institutes of Health lists all ongoing and upcoming US trial form many cancer types.
EmergingMed Clinical Trial Navigation Service - https://app.emergingmed.com/emed/home
Cancer Study Locator - https://cancerstudylocator.com/azo/home
http://www.clearityfoundation.org/clinical-trials/clinical-trial-results/by-drug-class/