NRAS and colorectal carcinoma: We therefore investigated DNA methylation levels in 61 NRAS‐mutation(+) CRC and 144 NRAS‐mutation(−) CRC samples using 6 Group 1 and 13 Group 2 methylation markers by pyrosequencing to characterize epigenetic features of NRAS‐mutation(+) CRC and analyzed its clinicopathological features.