KRAS and neoplasm: In the multivariate analysis using the Cox proportional hazard model (Additional file3: Table S2) for multiple factors such as age, gender, AJCC stage, microsatellite instability and tumor differentiation, the relative risk was 1.75 for CRC with KRAS mutation(95% CI 1.26-2.42; p = 0.0011) and 6.70 for advanced AJCC stage(95% CI 4.78-9.31; p ≤ 0.0001).