Continuous infusion of high-dose 5-fluorouracil in combination with leucovorin and recombinant interferon-alpha-2b in patients with advanced colorectal cancer. A Multicenter Phase II study.
BACKGROUND
5-Fluorouracil (5-FU), when combined with leucovorin (LV) or interferon-alpha (IFN-alpha), may result in improved response rates compared with 5-FU alone in patients with advanced colorectal cancer. The authors investigated the clinical efficacy of combining these three agents for patients in this group.


METHODS
Forty-five patients were administered outpatient high-dose 5-FU, 60 mg/kg/48 hours (2400 mg/m2/48 hours) continuous intravenous infusion on days 1 and 2; LV, 90 mg orally every 6 hour, 8 times during 5FU infusion; and recombinant IFN-alpha-2b, 10 x 10(6) IU/dose subcutaneously on days 1, 3, and 5. Cycles were repeated weekly for 4 weeks and every 2 weeks thereafter.


RESULTS
Forty-four patients were evaluable for response, and 11 patients (25%; 95% confidence interval, 12-38%) achieved a partial response with a median duration of 11 months. Median survival time for all patients was 11 months. Grade 3 and Grade 4 toxicities occurred in 21 patients (47%), which necessitated discontinuation of treatment in 2 patients (4%); permanent dose reductions were necessary in 11 patients (24%). The addition of IFN-alpha produced more 5-FU-related toxicity compared with a previous study in which the same dosage and schedule of 5-FU plus LV was used.


CONCLUSIONS
The efficacy of 5-FU continuous infusion combined with LV and IFN-alpha does not appear to differ significantly from earlier reports on treatment using 5-FU plus LV or 5-FU plus IFN-alpha for patients with colorectal cancer. However, this schedule of 5-FU combined with LV and IFN-alpha produces less toxicity compared with previous trials using bolus 5-FU plus IFN-alpha.
University Hospital Nijmegen, Department of Medical Oncology, The Netherlands.
C J
CJ
Punt
J T
JT
Burghouts
J J
JJ
Croles
P A
PA
van Liessum
P H
PH
de Mulder
Y
Y
Kamm
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage* / Q000009:adverse effects; D015179:Colorectal Neoplasms / Q000628:therapy*; D004334:Drug Administration Schedule; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage; D006801:Humans; D007262:Infusions, Intravenous; D016898:Interferon-alpha / Q000008:administration & dosage; D002955:Leucovorin / Q000008:administration & dosage; D008297:Male; D008875:Middle Aged; D011994:Recombinant Proteins / Q000008:administration & dosage; D016896:Treatment Outcome
D016898:Interferon-alpha; D011994:Recombinant Proteins; D002955:Leucovorin; D005472:Fluorouracil