Currently, there are seven active and approved chemotherapy drugs for patients with metastatic colorectal cancer: 5-FU, capecitabine, irinotecan, oxaliplatin, bevacizumab, cetuximab, and panitumumab. Among the best studied ways of putting some of these drugs together are the regimen Folfox and Folfiri. Three randomized studies demonstrated improved response rates, progression-free survival (PFS), and OS when irinotecan or oxaliplatin was combined with 5-FU-leucovorin. Intergroup study N9741 then compared IFL with FOLFOX4 in first-line treatment for patients with metastatic colorectal cancer. Patients assigned to FOLFOX4 experienced an improved PFS (median, 6.9 months vs. 8.7 months; P = .014; HR = 0.74; 95% CI, 0.61–0.89) and OS (15.0 months vs. 19.5 months, P = .001; HR = 0.66; 95% CI, 0.54–0.82) compared with patients randomized to IFL. Subsequently, two studies compared FOLFOX with FOLFIRI, and patients were allowed to cross over upon progression on first-line therapy, respectively. PFS and OS were identical between the treatment arms in both studies. Since the publication of these studies, the use of either FOLFOX or FOLFIRI is considered acceptable for first-line treatment of patients with metastatic colorectal cancer.Avastin is also approved with 5FU containing regimens for first line. Forfiri is FDA approved also with Erbitux.
The Folfox regimen includes a 22 hour continuous infusion of 5FU. While this can be done through a pump on the outpatient basis, it is often delivered inpatient. The FLOX regimen eliminates the infusion part and is slowly gaining on the Folfox because it is more convenient. However, at the present time, Folfox has more supporting studies and is more widely used than FLOX.
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nccn.org, colorectal 2014
Van Cutsem E, Köhne CH, Láng I, et al. Cetuximab plus irinotecan, fluorouracil, and leucovorin as first-line treatment for metastatic colorectal cancer: updated analysis of overall survival according to tumor KRAS and BRAF mutation status. J Clin Oncol. 2011;29(15):2011-2019. – See more at: http://www.onclive.com/web-exclusives/FDA-Approves-Cetuximab-Plus-FOLFIRI-Regimen-for-Metastatic-Colorectal-Cancer/#sthash.OPP6OpDc.dpuf