"Experiments have proved that tea polyphenols in tea leaves can fight against cancer, but so far we do not know how much of this component people can absorb by drinking tea." Jin Heiying, associate chief physician of Nanjing Hospital of Traditional Chinese Medicine, is one of the researchers on hereditary familial colon cancer in Nanjing. He is currently preparing a 7000-sample colon cancer specimen library. "On the one hand, we try to find ways to treat genes, and on the other hand, we seek whether Chinese medicine can fight against cancer.