C.T.F. was supported by The Research Institute of the McGill University Health Centre Studentship (RI-MUHC) Award, Ovarian Cancer Canada Trainee Travel (Research) Award, and James O. and Maria Meadows Award. W.M.A. was supported by a Scholarship Award from The Ministry of Education, Saudi Arabia. The research was supported by the following: The Canadian Institute for Health Research (CIHR) operating grants (PCC-156736 to P.N.T., Celia M.T. Greenwood, J.R.; PJT-156124 to P.N.T., J.R.); Cancer Research Society and Ovarian Cancer Canada partnership grant (21123 to P.N.T.); FRQS and Quebec Breast Cancer Foundation network grants to P.N.T.; and Compute Canada resource allocation project wst-164 and Genome Canada Genome Technology Platform award to J.R. The ovarian tumour banking was supported by the Banque de tissus et de données of the Réseau de recherche sur le cancer of the FRQS, affiliated with the Canadian Tumor Repository Network (CTRNet). The RI-MUHC and CRCHUM receive support from the FRQS. The sequencing of the Gen3G offspring was sponsored by Fonds de recherche du Québec, McGill University, and Université de Sherbrooke. M.T. was supported by the NIHR Cambridge Biomedical Research Centre (BRC-1215-20014).