Purpose: This study was designed to evaluate the effect of CYP2D6 and ABCB1 polymorphisms and co-medication on the outcomes and adverse events (AEs) of tamoxifen therapy.
Methods: In total, 258 women (187 postmenopausal and 71 premenopausal) with hormone positive breast carcinoma were retrospectively evaluated. CYP2D6 polymorphisms were evaluated with AmpliChip (Roche), and polymorphisms of ATP-binding cassettes B1 (P-glycoprotein) (ABCB1) rs2032582 and rs1045642 with restriction fragment length polymorphisms polymerase chain reaction (RFLP-PCR).