<prompt> Tamoxifen predisposes to :Endometrial cancerOvarian cancerCervical cancerVaginal cancer  <response>: In Breast Cancer although tamoxifen improves the survival period, it causes endometrial hyperplasia and cancer, and requires regular monitoring with ultrasound study of endometrium and endometrial biopsy. Reference: Shaws Textbook of Gynaecology 16th edition page no 540 