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This is a single-country, retrospective, observational biomarker study conducted in Greece to evaluate Folate Receptor Alpha (FRα) expression in patients with high-grade serous ovarian, fallopian tube, and primary peritoneal cancer at the time of diagnosis. Approximately 200 eligible female patients (≥18 years) diagnosed between 1 January 2001 and 30 July 2025 will be included from around 15 clinical sites affiliated with the Hellenic Cooperative Oncology Group. Historically collected Formalin-Fixed Paraffin-Embedded (FFPE) tissue samples stored in the Hellenic Cooperative Oncology Group biobank will be analyzed centrally using the Ventana FOLR1 RxDx assay to determine FRα expression. Only samples collected at initial diagnosis will be included; relapse samples will be excluded. The primary objective is to assess the prevalence of FRα-positive status, defined as ≥75% viable tumor cells
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