Abstract
Purpose
S-1 showed clinical activity in colorectal cancer, and the preclinical data of S-1 with oxaliplatin showed synergistic activity in an animal model. This phase I study was conducted to determine the maximum tolerated dose of S-1 with oxaliplatin and to define its recommended dose for the subsequent phase II study.
Materials and Methods
Patients with untreated colorectal adenocarcinoma were eligible in this study if they had measurable lesions. S-1 was administered on days 1–14, with doses starting from 60 mg/m2 per day and escalating by 10 mg/m2 at each dose level. Oxaliplatin was given at the fixed dose of 130 mg/m2, through 2-h i.v. infusion on day 1. The treatment was repeated every 3 weeks.
Results
A total of 27 patients received six different S-1 dose levels. The dose-limiting toxicities (DLTs) were neutropenia, diarrhea, and vomiting. At dose level 5 (100 mg/m2), two patients experienced DLTs, while none of the third cohorts did. At dose level 6 (110 mg/m2), two patients experienced DLTs, and one of them died from treatment-related toxicity. The accrual was then stopped.
Conclusions
The recommended dose is S-1 100 mg/m2 on days 1–14, with 130 mg/m2 oxaliplatin on day 1, every 3 weeks. This regimen is proposed for the phase II study.
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Abbreviations
- MTD:
-
Maximum tolerated dose
- RD:
-
Recommended dose
- DLT:
-
Dose-limiting toxicity
- 5-FU:
-
5-Fluorouracil
- CRC:
-
Colorectal carcinoma
- ANC:
-
Absolute neutrophil count
- DI:
-
Dose intensity
- TS:
-
Thymidylate synthase
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Acknowledgement
The S-1 that was used in this study was donated by Jeil Pharmaceutical Co., Ltd., Seoul, Korea (product of Taiho Pharmaceutical Co., Tokyo, Japan), and the oxaliplatin was provided by Sanofi-Aventis.
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Kim, H.S., Park, M.J., Uhm, J.E. et al. A phase I trial of S-1 with oxaliplatin in patients with relapsed and metastatic colorectal cancer. Int J Colorectal Dis 24, 1311–1316 (2009). https://doi.org/10.1007/s00384-009-0758-3
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DOI: https://doi.org/10.1007/s00384-009-0758-3