Objective To investigate the frequency of ovarian cysts in tamoxifen treated postmenopausal breast cancer patients with endometrial thickening detected by transvaginal sonography stromectol dosage for pinworms Soy phytoestrogens are selective estrogen blockers that bind to ERОІ with a 20 1 affinity over ERО± and in addition they will increase the number of ERОІ and decrease the ERО± in cells