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  • Title: CAPOX associated with toxicities of higher grade but improved disease-free survival when compared with FOLFOX in the adjuvant treatment of stage III colon cancer.
    Author: Loree JM, Mulder KE, Ghosh S, Spratlin JL.
    Journal: Clin Colorectal Cancer; 2014 Sep; 13(3):172-7. PubMed ID: 24630275.
    Abstract:
    INTRODUCTION/BACKGROUND: Adjuvant treatment of colon cancer relies on fluoropyrimidine-containing regimens as the intravenous formulation, 5-FU, or its oral prodrug, CA, combined with oxaliplatin (FOLFOX and CAPOX). There is currently no clinical trial comparing the 2 regimens; however, both are considered standard of care treatment options. MATERIALS AND METHODS: We performed a retrospective chart review comparing average relative dose intensity (ARDI), percentage of intended total dose (PITD), overall survival (OS), DFS, and toxicity profiles of these regimens. The patients (n = 176) received either modified FOLFOX6 (n = 93) or CAPOX (n = 83). RESULTS: Oxaliplatin ARDI (80.72% vs. 87.11%; P = .0033) and PITD (70.09% vs. 88.11%; P = .0013) was significantly lower in those treated with CAPOX compared with FOLFOX. CA ARDI (87.10% vs. 93.60%; P < .0001) and PITD (77.19% vs. 88.11%; P = .0006) was significantly lower than 5-FU dosing. Patients treated with CAPOX had more ≥ Grade 2 toxicities and trended toward more dose-limiting toxicities. Survival analysis demonstrated a trend toward improved OS with CAPOX (hazard ratio [HR], 0.4741; 95% confidence interval [CI], 0.1660-1.354; P = .1663) and improved DFS with CAPOX (HR, 0.4949; 95% CI, 0.2512-0.9749; P = .0420). Multivariate analysis demonstrated similar results with CAPOX being associated with a trend toward improved OS (HR, 0.396; 95% CI, 0.110-1.429; P = .1571) and DFS (HR, 0.458; 95% CI, 0.210-1.001; P = .0504). CONCLUSION: Patients receiving CAPOX had significantly lower ARDI and PITD compared with FOLFOX, but showed trends toward improved outcomes when treated with CAPOX in the adjuvant setting when compared with FOLFOX.
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