綠茶中的 Epigallocatechin gallate (EGCG) 可以明顯抑制老鼠乳癌腫瘤的生長。

在 5 個星期的實驗中，實驗組餵給相當於  50-100 mg / kg天 的 綠茶EGCG。老鼠注射乳癌的乳房細胞。實驗結果顯示，綠茶EGCG 組的乳癌腫瘤比對照組重量小了 68%。

Gu JW, Young E, Covington J, Johnson JW, Tan W. Oral Administration of EGCG, an Antioxidant Found in Green Tea, Inhibits Tumor Angiogenesis and Growth of Breast Cancer in Female Mice. Presented at the 121st Annual Meeting of the American Physiological Society, part of the Experimental Biology 2008 scientific conference, San Diego, April 2008.