Some retrospective studies with tamoxifen 20 mg day have shown an association between poor CYP2D6 metabolizers or levels of the most potent metabolite endoxifen below 9 or 16 nM and higher risk of recurrence in the adjuvant setting 4, 5, 6, but the association with CYP2D6 has not been shown in the NSABP P1 and P2 tamoxifen prevention trials 7 buy priligy cheap 65 model including grade vs HR 4