Weekly 5-fluorouracil and leucovorin: achieving lower toxicity with higher dose-intensity in adjuvant chemotherapy after colorectal cancer resection

Ann Oncol. 2004 Apr;15(4):568-73. doi: 10.1093/annonc/mdh134.

Abstract

Background: Current standard therapy following resection of high-risk colon cancer is intravenous bolus 5-fluorouracil (5-FU) with leucovorin (LV), but there is no consensus on the optimum regimen of these drugs: practice ranges from the high toxicity Mayo Clinic schedule to the very low toxicity weekly QUASAR schedule. We present data for a weekly schedule that aims to provide moderately dose-intense treatment with low toxicity.

Patients and methods: One hundred and sixty-two patients were studied: 60% male; median age 65 years (36% over 70 years); 94% colorectal primary. Treatment was intravenous bolus (5 min) 5-FU 425 mg/m(2) plus D,L-LV 45 mg flat rate once weekly, for a planned 24 weeks. Data for toxicity, dose-reductions, delays and stoppages were collected.

Results: Overall, 20% of patients experienced any grade > or = 3 toxicity, most commonly diarrhoea (14% patients). Dose reductions were made in 35% of patients (although only 21% required 20% or more reduction); toxicity contributed to a decision to stop treatment before 24 weeks in 16% of patients. Median delivered dose intensity (DI) was 96% of planned (407 mg/m(2)/week) during treatment, and 91% of planned (385 mg/m(2)/week) over the full 24 week treatment plan. Female sex and age >70 years were significantly associated with higher rates of toxicity and dose adjustment, and lower delivered DI.

Conclusions: Weekly treatment at these doses is convenient and well-tolerated for the large majority of patients, and achieves DI comparable with the 5 days a month QUASAR schedule and other more toxic standard regimens.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Antineoplastic Combined Chemotherapy Protocols / adverse effects
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
  • Chemotherapy, Adjuvant
  • Colorectal Neoplasms / drug therapy*
  • Colorectal Neoplasms / surgery
  • Female
  • Fluorouracil / administration & dosage
  • Fluorouracil / adverse effects
  • Humans
  • Leucovorin / administration & dosage
  • Leucovorin / adverse effects
  • Male
  • Middle Aged
  • Treatment Outcome

Substances

  • Leucovorin
  • Fluorouracil