Journal of Clinical Oncology, Vol 15, 2030-2039, Copyright © 1997 by American Society of Clinical Oncology
Adjuvant postoperative fluorouracil-modulated chemotherapy combined with pelvic radiation therapy for rectal cancer: initial results of intergroup 0114
JE Tepper, MJ O'Connell, GR Petroni, D Hollis, E Cooke, AB Benson 3rd, B Cummings, LL Gunderson, JS Macdonald and JA Martenson
Department of Radiation Oncology, University of North Carolina at Chapel Hill, School of Medicine 27599-7512, USA. tepper@radonc.unc.edu
PURPOSE: The combination of radiation therapy with fluorouracil (5-FU)-
based chemotherapy is generally accepted as appropriate postoperative
therapy for patients with adenocarcinomas of the rectum that extend through
the bowel wall or with lymph nodes positive for tumor. We attempted to
determine whether the efficacy of this postoperative therapy could be
improved by the addition of leucovorin and/or levamisole. METHODS: A total
of 1,696 patients were randomized and eligible for treatment with one of
four treatment schemes. All patients received two cycles of bolus
5-FU-based systemic chemotherapy followed by pelvic radiation therapy with
chemotherapy and two more cycles of the same systemic chemotherapy.
Chemotherapy was either 5-FU alone, 5- FU with leucovorin, 5-FU with
levamisole, or 5-FU with leucovorin and levamisole. RESULTS: With a median
follow-up duration of 48 months, there is no statistically significant
advantage to any of the treatment regimens compared with bolus 5-FU alone.
There is evidence of increased gastrointestinal toxicity with the
three-drug combination compared with bolus 5-FU alone. Statistical analysis
suggests it is very unlikely that either levamisole-containing combination
will be shown to be of value with further follow-up evaluation. CONCLUSION:
There is no evidence at present for a beneficial effect of levamisole in
the adjuvant treatment of rectal cancer. Definitive evaluation of the
effect of the addition of leucovorin to 5-FU and pelvic radiation will
require further follow-up evaluation.
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