Layout table for study information Study Type Interventional Clinical Trial Estimated Enrollment 240 participants Masking None Open Label Primary Purpose Treatment Official Title A Phase II Prospective Trial Correlating Progression Free Survival With CYP2D6 Activity in Patients With Metastatic Breast Cancer Treated With Single Agent Tamoxifen Actual Study Start Date September 21, 2010 Actual Primary Completion Date November 30, 2020 Estimated Study Completion Date May 31, 2023 priligy dapoxetine 60mg