Study Looking at Biomarkers in Ovarian Cancer

Inclusion Criteria: * Histological diagnosis of stage III or IV high grade serous ovarian, tubal or primary peritoneal cancer. * Must be 18 years of age or older. * Eastern Cooperative Oncology Group (ECOG) Performance Status 0-1. * Have a life expectancy greater than or equal to 6 months. * Able to provide adequate informed consent. * Willing to undergo blood or fluid collection and tumour biopsy * Patients enrolled at the time of surgery must agree to have part of their tumour used for the purpose of the study. * Archival tissue must be available for patients that are enrolled at the time of progression. Exclusion Criteria: * Must not have early stage (I and II) high grade serous, tubal or primary peritoneal cancer. * Must not have other tumour histology other than high grade serous. * Must not have contraindication to tumour biopsy and/or blood sampling.