Improving Adjuvant Therapy for Rectal Cancer by Combining Protracted-Infusion Fluorouracil with Radiation Therapy after Curative Surgery
Michael J. O'Connell, James A. Martenson, Harry S. Wieand, James E. Krook, John S. Macdonald, Daniel G. Haller, Robert J. Mayer, Leonard L. Gunderson, and Tyvin A. Rich
Background The combination of radiation therapy and chemotherapywith fluorouracil plus semustine after surgery has been establishedas an effective approach to decreasing the risk of tumor relapseand improving survival in patients with rectal cancer who areat high risk for relapse or death. We sought to determine whetherthe efficacy of chemotherapy could be improved by administeringfluorouracil by protracted infusion throughout the durationof radiation therapy and whether the omission of semustine wouldreduce the toxicity and delayed complications of chemotherapywithout decreasing its antitumor efficacy.
Methods Six hundred sixty patients with TNM stage II or IIIrectal cancer received intermittent bolus injections or protractedvenous infusions of fluorouracil during postoperative radiationto the pelvis. They also received systemic chemotherapy withsemustine plus fluorouracil or with fluorouracil alone in ahigher dose, both before and after the pelvic irradiation.
Results With a median follow-up of 46 months among survivingpatients, patients who received a protracted infusion of fluorouracilhad a significantly increased time to relapse (P = 0.01) andimproved survival (P = 0.005). There was no evidence of a beneficialeffect in the patients who received semustine plus fluorouracil.
Conclusions A protracted infusion of fluorouracil during pelvicirradiation improved the effect of combined-treatment postoperativeadjuvant therapy in patients with high-risk rectal cancer. Semustineplus fluorouracil was not more effective than a higher doseof systemic fluorouracil given alone.
Source Information
From the Mayo Clinic, Rochester, Minn. (M.J.O., J.A.M., H.S.W., L.L.G.); the Duluth Clinic, Duluth, Minn. (J.E.K.); Temple University School of Medicine (J.S.M.) and the University of Pennsylvania Cancer Center (D.G.H.), Philadelphia; the Dana-Farber Cancer Institute, Boston (R.J.M.); and the M.D. Anderson Cancer Center, Houston (T.A.R.).Coordinated by the North Central Cancer Treatment Group, Rochester, Minn. Other participants include the Southwest Oncology Group, the Eastern Cooperative Oncology Group, Cancer and Acute Leukemia Group B, the Radiation Therapy Oncology Group, and the M.D. Anderson Cancer Center.
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