Safety and pharmacokinetics of S-1 in a recurrent colon cancer patient with chronic myeloid leukemia treated with dasatinib: A case report

Toshinori Sueda, Toshihiro Kudo, Daisuke Sakai, Mamoru Uemura, Junichi Nishimura, Taishi Hata, Ichiro Takemasa, Tsunekazu Mizushima, Hirofumi Yamamoto, Sachiko Ezoe, Kana Matsumoto, Yuichiro Doki, Masaki Mori, Taroh Satoh

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2 Citations (Scopus)


Purpose: The safety of S-1 in recurrent colorectal cancer patients with chronic myeloid leukemia (CML) treated with dasatinib has not been established. We evaluated the safety and pharmacokinetics of S-1 in a recurrent colon cancer patient with CML treated with dasatinib. Patient: A 70-year-old man had undergone surgery three times for sigmoid colon cancer and recurrence. Systemic chemotherapy with S-1 plus oxaliplatin plus bevacizumab as a clinical trial had already been administered because of metastatic colon cancer. The patient's medical history was CML, and he had been receiving dasatinib treatment (100 mg once daily). Based on the diagnosis of unresectable and multiple metastases, S-1 monotherapy was started. S-1 (120 mg/day) was taken for 28 consecutive days, followed by a 14-day rest. Blood samples were obtained before and after the first administration of S-1. The plasma pharmacokinetics of S-1 were comparable to a pharmacokinetics study of S-1. Results: The area under the plasma concentration-time curve (AUC0-8) of tegafur (FT), 5-chloro-2, 4-dihydroxypyridine (CDHP), oxonate (Oxo), and 5-fluorouracil (5-FU) was 4,309.2, 716.3, 86.8, and 492.75 ng h/mL, respectively, after S-1 administration. The pharmacokinetics of FT, CDHP, Oxo, and 5-FU after treatment with S-1 were not significantly different from a phase I pharmacokinetics study of S-1. During treatment with S-1 and dasatinib, CML relapse and serious myelosuppression were not observed. Conclusions: Our report suggests that S-1 is an important treatment option for recurrent colorectal cancer in patients with CML treated with dasatinib.

Original languageEnglish
Pages (from-to)1321-1324
Number of pages4
JournalCancer chemotherapy and pharmacology
Issue number6
Publication statusPublished - Nov 19 2014
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Oncology
  • Toxicology
  • Pharmacology
  • Cancer Research
  • Pharmacology (medical)

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