NCIt definition : Stage IIIA1 includes: T1/2, N1, M0. T1: Ovarian cancer with tumor limited to ovaries
(one or both). T2: Ovarian cancer with tumor involving one or both ovaries with pelvic
extension below pelvic brim. N1: Positive retroperitoneal lymph nodes only (histologically
confirmed). M0: No distant metastasis. (AJCC 8th Ed.);