Abstract
S-1, an oral fluoropyrimidine derivative, has previously demonstrated anticancer efficacy in pancreatic cancer (PC), predominantly in Asian populations. This study evaluated the antitumor effect and safety of S-1 in Caucasian patients with metastatic PC. Chemotherapy-naïve patients received S-1 orally at 30 mg/m(2) twice daily (BID) for 2 weeks, repeated every 3 weeks. Primary endpoint was ORR. Secondary endpoints included PFS, OS and safety assessment. The trial had a Simon's two-stage design with 22 patients evaluable for efficacy in stage 1 and an additional 18 patients in stage 2, if ≥3/22 patients had a confirmed response at the first stage. Three out of 27 patients showed PR, however, detection of asymptomatic brain metastases in one of them prevented this study from proceeding to stage 2. The median PFS and OS for all patients was 3.5 and 9.1 months, respectively. The median duration of disease control for patients with SD or PR (n = 17) was 4.3 months. S-1 was well tolerated; fatigue was the most frequent grade 3/4 adverse event. Efficacy data of PFS and OS are at least comparable to gemcitabine, the current standard of care. S-1 is active in Caucasian patients with metastatic PC.
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