buy propecia uk Retrieved studies were deemed eligible provided that they met all the following criteria 1 studies on human beings; 2 in a cohort design or randomized controlled trial design; 3 investigated the effect of CYP2D6 10 polymorphism with outcome of breast cancer patients taking tamoxifen; 4 in Asian population; 5 treated with 20 mg day adjuvant tamoxifen for 2 5 years; 6 detailed outcomes could be obtained or calculated on the outcome of disease free survival DFS, overall survival OS or recurrence rate; 7 the number of women with breast cancer was 30; 8 and received more than 4 points in the Newcastle Ottawa Scale NOS, which was considered to be of high quality