Tissue sections were obtained from formalin fixed paraffin embedded blocks from normal ovaries (n = 8), benign serous tumors (n = 8), serous borderline tumors (n = 10), and primary advanced stage (FIGO stage III/IV) serous ovarian cancers (n = 126). The cancer tissues were assembled into tissue microarrays (TMAs, 1 mm triplicate cores) from archived tissue (cancer areas identified by pathologist, AR) obtained from serous ovarian cancer patients diagnosed between 1988 and 2012. An additional 21 tissues were obtained from patients with high grade serous cancer after they had received neoadjuvent chemotherapy. Approval was obtained from the Royal Adelaide Hospital Human Ethics Committee and methods were carried out in accordance with the approved guidelines. Detailed pathological and clinical characteristics of the patient samples are summarized in Supplementary Table 3.