Combination therapy of S-1 and CDDP for patients with colorectal cancer

Purpose We evaluate the feasibility and efficacy of S-1 in combination with cisplatin (CDDP) for patients with colorectal cancer. Methods A total of 52 patients with advanced or recurrent colorectal cancer were included. S-1 was given orally twice daily for 21 days and CDDP 30 mg/m² on day 1 and 8, followed by a 2-week period of no treatment. Results Tumor responses among patients included 18 PR, 12 SD, and 16 PD (n = 46). The overall response rate was 36.4% (18/46). The response rate of the patients with prior chemotherapy was 22.2% (4/18) and 50.0% (12/24) among the patients who had no prior therapy. The median survival periods were 555 days and the median progression free survival periods were 183 days, respectively. S-1 in combination with CDDP shows promising activity with acceptable toxicities against colorectal cancer. Conclusions A combination of S-1 and CDDP could be a standard therapy for treating colorectal carcinoma.