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Japanese Journal of Clinical Oncology, Vol 28, Issue 6 374-377, Copyright © 1998 by Foundation for Promotion of Cancer Research

ORIGINAL ARTICLE

Low-dose cisplatin-5-fluorouracil prevents postoperative suppression of natural killer cell activity in patients with gastrointestinal cancer

K Ishikawa, K Shimoda, N Shiraishi, Y Adachi and S Kitano
Department of Surgery I, Oita Medical University, Japan.

BACKGROUND: The effect of administering low-dose cisplatin (CDDP)-5-fluorouracil (5-FU) postoperatively on the activity of the immune system is not known. To clarify the effect on natural killer (NK) cell activity of treatment with low-dose CDDP-5-FU, we compared NK cell activity after surgery for gastrointestinal cancer in patients treated with low-dose CDDP-5-FU, a bolus dose of mitomycin C (MMC) or no anticancer drug. METHODS: Sixty-two patients consisted of three groups: low-dose CDDP-5-FU (n = 15), MMC (n = 20) and no-drug (n = 27). Chemotherapy was initiated immediately after surgery. NK cell activity was measured on the day before surgery (pre-op) and on postoperative days 7 (POD7) and 21 (POD21). RESULTS: The NK cell activities of the CDDP-5-FU group were 37.7% at pre-op, 36.1% on POD7 and 33.6% on POD21. However, the NK cell activities in the no-drug and MMC groups were significantly decreased on POD7 (from 36.6 to 24.8% and from 31.4 to 16.6%, respectively). The NK cell activity in the MMC group remained depressed on POD21 (18.6%) whereas that in the no-drug group recovered (31.6%). CONCLUSIONS: Consecutive administration of low-dose CDDP-5-FU appears to be useful as postoperative adjuvant chemotherapy because of its preventive effect on NK cell suppression after surgery.
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