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Related Experiment Videos

A novel weekday-on/weekend-off UFT schedule.

S Sadahiro1, H Makuuchi, T Suzuki

  • 1Department of Surgery, Tokai University School of Medicine, Isehara, Japan.

Oncology (Williston Park, N.Y.)
|December 1, 2000
PubMed
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A new weekday-on/weekend-off schedule for UFT chemotherapy significantly improved tumor response and survival in rats compared to daily dosing. This novel schedule shows promise for colorectal cancer adjuvant therapy in humans.

Area of Science:

  • Oncology
  • Pharmacology
  • Cancer Research

Background:

  • Conventional daily UFT (uracil and tegafur) chemotherapy is a standard treatment for various cancers.
  • Optimizing chemotherapy schedules can enhance efficacy and reduce toxicity.
  • Investigating intermittent dosing schedules may offer therapeutic advantages.

Purpose of the Study:

  • To compare the efficacy and safety of a weekday-on/weekend-off UFT schedule versus a conventional daily schedule in a preclinical cancer model.
  • To evaluate the pharmacokinetic profile of fluorouracil (5-FU) during the drug-free interval of the intermittent schedule in human subjects.
  • To assess the compliance, toxicity, and efficacy of the weekday-on/weekend-off UFT schedule as adjuvant therapy for colorectal cancer in a clinical setting.

Main Methods:

Related Experiment Videos

  • A cancer-bearing rat model was used to compare tumor response and survival between the two UFT schedules (600 mg/day for 5 days vs. 400 mg/day daily).
  • Human subjects underwent pharmacokinetic studies to measure plasma and tumor 5-FU concentrations during the 2-day drug-free period.
  • A one-year clinical study evaluated compliance and toxicity of the intermittent schedule in colorectal cancer patients.

Main Results:

  • The weekday-on/weekend-off UFT schedule demonstrated significantly greater antitumor activity and increased survival in rats compared to the daily schedule.
  • No significant differences in adverse reactions were observed between the schedules in the rat model.
  • In human subjects, plasma 5-FU levels decreased significantly after 24 hours, but tumor concentrations remained elevated during the 2-day drug-free interval.

Conclusions:

  • The weekday-on/weekend-off UFT schedule is a promising alternative to conventional daily dosing, offering improved efficacy with comparable safety.
  • The sustained tumor drug concentration during the intermittent schedule may contribute to enhanced antitumor effects.
  • The findings support the recommendation of the weekday-on/weekend-off UFT schedule for further clinical trials in adjuvant colorectal cancer chemotherapy.