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Phase III trial of irinotecan plus infusional 5-fluorouracil/folinic acid versus irinotecan plus oxaliplatin as first-line treatment of advanced colorectal cancer.

Author(s): Fischer von Weikersthal L, Schalhorn A, Stauch M, Quietzsch D, Maubach PA, Lambertz H, Oruzio D, Schlag R, Weigang-Kohler K, Vehling-Kaiser U, Schulze M, Truckenbrodt J, Goebeler M, Mittermuller J, Bosse D, Szukics B, Grundeis M, Zwingers T, Giessen C, Heinemann V

Affiliation(s): Klinikum Sankt Marien, Amberg, Germany.

Publication date & source: 2011-01, Eur J Cancer., 47(2):206-14.

Publication type: Clinical Trial, Phase III; Comparative Study; Multicenter Study; Randomized Controlled Trial; Research Support, Non-U.S. Gov't

PURPOSE: To determine whether irinotecan plus oxaliplatin (mIROX) is superior to irinotecan plus infusional 5-fluorouracil, leucovorin (FUFIRI) as first-line therapy of patients with metastatic colorectal cancer (mCRC). PATIENTS AND METHODS: A phase III, randomised, open-label multicentre study compared standard treatment with FUFIRI (irinotecan 80 mg/m(2), 5-fluorouracil 2000 mg/m(2), folinic acid 500 mg/m(2) weekly times 6) to mIROX using an identical schedule of irinotecan plus oxaliplatin 85 mg/m(2) applied on days 1, 15 and 29 of a 7-week cycle. The primary end-point was progression-free survival (PFS). RESULTS: A total of 479 eligible patients were randomly assigned. Progression-free survival was 7.2 months in the mIROX arm and 8.2 months in the FUFIRI arm [hazard ratio=1.14; 95% confidence interval (CI) 0.94-1.37; P=0.178]. Comparable results were also obtained for overall survival time with 19 months in the mIROX-arm and 22 months in the FUFIRI-arm (hazard ratio=1.08, P=0.276). Both regimens induced an identical objective response rate (ORR) of 41%, but disease control rate (ORR plus stable disease) was significantly greater in the FUFIRI group (81% versus 68%, P=0.001). Most frequent grades 1-4 side-effects of mIROX and FUFIRI treatment were nausea (80% versus 73%) and delayed diarrhoea (79% versus 68%). Grades 3-4 toxicities were generally below 10%, except for diarrhoea which was more frequent in the mIROX-arm compared to the FUFIRI-arm (19% versus 30%, P=0.006) CONCLUSION: mIROX failed to show superior activity compared to high-dose 5-FU/folinic acid plus irinotecan. Due to better tolerability the combination of high-dose 5-FU/folinic acid and irinotecan remains a standard of care in first-line treatment of metastatic colorectal cancer. Copyright (c) 2010 Elsevier Ltd. All rights reserved.

Page last updated: 2011-12-09

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