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Objective  To compare the pathological features and survival outcomes at different age subgroups of young patients with colon cancer.    Methods  Using Surveillance, Epidemiology, and End Results (SEER) population-based data, we identified 2,861 young patients with colon cancer diagnosed between 1988 and 2005 treated with surgery. Patients were divided into four groups: group 1 (below 25 years), group 2 (26–30 years), group 3 (31–35 years) and group 4 (36–40 years). Five-year cancer specific survival data were obtained. Kaplan-Meier methods were adopted and multivariable Cox regression models were built for the analysis of long-term survival outcomes and risk factors.    Results  There were significant different among four groups in pathological grading, histological type, AJCC stage, current standard (≥12 lymph nodes retrieval), mean number of lymph nodes examined and positive lymph nodes (p<0.001). The 5-year cause specific survival was 71.0% in group 1, 75.1% in group 2, 80.6% in group 3 and 82.5% in group 4, which had significant difference in both univariate (P = 0.002) and multivariate analysis (P = 0.041).    Conclusions  Young patients with colon cancer at age 18–40 years are essentially a heterogeneous group. Patients at age 31–35, 36–40 subgroups have more favorable clinicopathologic characteristics and better cancer specific survival than below 30 years.

Pathological Features and Survival Outcomes of Young Patients with Operable Colon Cancer: Are They Homogeneous?