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The aim of this study was to determine the maximum-tolerated dose (MTD), the dose-limiting toxicity (DLT) and the recommended dose (RD) of neoadjuvant chemotherapy (NAC) with gemcitabine (GEM) plus oral S-1 in patients with resectable pancreatic cancer. Thirteen patients with radiologically proven resectable pancreatic cancer were included in this study. S-1 was administered orally for 14 consecutive days, and GEM was administered on days 8 and 15 for two pre-operative cycles. The dose of S-1 in this study was planned with fixed doses of GEM (1,000 mg/m 2 ): 20, 30 and 40 mg/day for levels 0, 1 and 2, respectively. Treatment was initiated at level 1 in 3 patients, while adverse events occurred in 2 patients during the second course, leading to a dose reduction to level 0 for the 8 remaining patients. Two of the 10 patients enrolled at level 0 were excluded. Of the remaining 8 patients, GEM administration was terminated due to DLT on day 15, during the first course in 3 patients, while level 0 dosage reached MTD. Surgery was performed for the remaining 11 patients included in the study. Post-operative complications included pancreatic fistulas in 5 patients and Pseudomonas aeruginosa sepsis in 1 patient. Two of the 11 patients exhibited a partial response and 9 patients stable disease. Eight of the 11 tumor specimens showed histopathological evidence of tumor cell injury. In conclusion, NAC with GEM and S-1 was not well-tolerated in this study. However, pre-operative chemotherapy may be effective against pancreatic cancer. Therefore, it is necessary to reconsider NAC regimens for pancreatic cancer.

A phase I study of neoadjuvant chemotherapy with gemcitabine plus oral S-1 for resectable pancreatic cancer