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据美国1997年6月的研究报道，绿茶预防癌症发生的效果优于红茶，主要原因是，绿茶能抑制一种癌细胞生长所必需的酶——尿激酶。人体癌细胞需要蛋白水解酶类以侵染正常细胞和实现转移，其中最重要的一种酶是尿激酶。抑制尿激酶可以减小肿瘤的体积，甚至可使肿瘤完全消失。根据动
According to a study by the United States in June 1997, green tea is superior to black tea in preventing cancer. The main reason is that green tea inhibits the enzyme urokinase, an enzyme necessary for the growth of cancer cells. Human cancer cells require proteolytic enzymes to infect normal cells and metastasize, the most important of which is urokinase. Inhibition of urokinase can reduce the size of the tumor, and even completely disappear the tumor. According to action