Green tea polyphenols may enhance effectiveness of specific breast cancer endocrine treatments through both estrogen-dependent and -independent mechanisms.

2014 Pharmacology Interaction of Green Tea Catechins with Breast Cancer Endocrine Treatment: A Systematic Review Yiannakopoulou EC

Systematic Review Breast Cancer Green Tea

The methodology used in this systematic review involved a comprehensive search for relevant studies across various electronic databases. The search terms used were tailored to uncover data specifically regarding the interaction of green tea catechins with breast cancer endocrine treatment. Importantly, this review was focused on experimental trials which studied the synergistic effects of green tea catechins and certain breast cancer treatments, namely tamoxifen and raloxifene.

The analysis of results indicated that green tea catechins potentially work in conjunction with tamoxifen or raloxifene—used for treating both estrogen receptor-positive and receptor-negative breast cancer—via mechanisms that may depend or not depend on the estrogen receptor. At the same time, the review found no existing evidence showing any interaction of green tea catechins with aromatase inhibitors or fulvestrant. Notably, given their nature as natural compounds and their known safety profile, green tea catechins used along with tamoxifen could constitute a viable direction for enhancing chemoprevention, adjuvant, and metastatic breast cancer treatments.

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