Unexpected Twin Pregnancy in a BRCA2-Positive Breast Cancer Patient with Post-Chemotherapy Amenorrhea: A Case Report and Call for Comprehensive Contraceptive Counseling. - Omori, Rui; Gonda, Kenji; Arai, Megumi; Sawano, Toyoaki; Kurokawa, Tomohiro; Tamada, Yutaka; Yasui, Ayu; Nashinoto, Mika; Wada, Masahiro; Tachibana, Kazunoshin; Tanimoto, Tetsuya; Shimmura, Hiroaki; et al. (Case Reports in Oncology, 2025)