Lucia Shinta Ratnaningtyas, Prof.Dr. Tri Murti Andayani, Sp.FRS and Dr. apt. Dwi Endarti, S.F., M.Sc. 2026. COST EFFECTIVENESS ANALYSIS OF LETROZOLE VERSUS TAMOXIFEN IN EARLY-STAGE BREAST CANCER FOR POSTMENOPAUSAL WOMEN: SYSTEMATIC REVIEW. Journal of Health Economic and Policy Research (JHEPR). 4, 1 (Apr. 2026). DOI:https://doi.org/10.30595/jhepr.v4i1.301.