W Ichikawa, T Takahashi, K Suto, T Yamashita, Z Nihei, Y Shirota, M Shimizu, R Hirayama. Thymidylate synthase predictive power is overcome by irinotecan combination therapy with S-1 for gastric cancer. Br. J. Cancer 2004; 91:1425-1250,. Br. J. Cancer. 2004. 91. 1425-1250