Endoxifen Concentration Is Associated with Recurrence-Free Survival in Hormone-Sensitive Breast Cancer Patients. - Lee, Beomki; Nam, Seok Jin; Kim, Seok Won; Yu, Jonghan; Chae, Byung-Joo; Lee, Se Kyung; Ryu, Jai Min; Lee, Jeong Eon; Lee, Soo-Youn (Cancer Research & Treatment, 2025)