“ EGCG at a dose of 10 mg/kg significantly increased … concentration–time curve (P<0.05, 40.3%) of 4-hydroxytamoxifen , but the metabolite–parent ratio of 4-hydroxytamoxifen was also significantly altered (P<0.… of EGCG), implying that the formation of 4-hydroxytamoxifen was considerably affected by EGCG.”