Phase I study of S-1 and biweekly docetaxel combination chemotherapy for advanced and recurrent gastric cancer

Ikuo Takahashi, Yasunori Emi, Yoshihiro Kakeji, Eriko Tokunaga, Shin Ushiro, Eiji Oki, Masayuki Watanabe, Hideo Baba, Yoshihiko Maehara

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A phase I study of S-1 and biweekly docetaxel (DOC) combination therapy was conducted to determine the maximum tolerated dose (MTD) and pharmacokinetic parameters. Fourteen patients with advanced or recurrent gastric cancer were analyzed. The treatment consisted of S-1 [body surface area (BSA) <1.25 m2:80 mg/day, 1.25≤ BSA <1.50 m2: 100 mg/day, 1.50 m2≤ BSA; 120 mg/day, orally, day 1-14) and DOC (30-40 mg/m 2/day, intravenously, day 1 and 15], which were repeated as often as possible every four weeks. Pharmacokinetic analysis was done at DOC 40 mg/m 2/day. Initially, patients were administered S-1 and 40 mg/m 2/day of DOC, and DOC 40 mg/m2/day was considered as MTD. In detail, one patient developed neutropenia (grade 4, G4), and two other patients had no day 15 DOC administration because of neutropenia (grade 3, G3). When S-1 and 35 mg/m2/day of DOC were administered to three patients, no adverse reactions were noted. In six patients treated with S-1 and 30 mg/m2/day of DOC, one patient developed neutropenia (G4), and another patient developed diarrhea (G3) and anorexia (G3). The rest of this cohort showed no adverse reactions. Although 5-fluorouracil and gimeracil concentrations remained high under impaired renal function, no pharmacokinetic interactions appeared between S-1 and DOC under normal renal function. The dose limiting toxicity of a combination of S-1 and biweekly DOC was leukopenia and neutropenia. The recommended dose for this combination in phase II study is DOC 35 mg/m2/day.

Original languageEnglish
Pages (from-to)849-854
Number of pages6
JournalOncology reports
Issue number4
Publication statusPublished - Apr 2006

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research


Dive into the research topics of 'Phase I study of S-1 and biweekly docetaxel combination chemotherapy for advanced and recurrent gastric cancer'. Together they form a unique fingerprint.

Cite this