We also analyzed computational estimates of tumor purity (defined as the ratio of cancer vs noncancer cells in the sequenced samples) for the LARC‐TCGA cohort that had been obtained using the ABSOLUTE algorithm based on SNP6 array data from TCGA [38], and no significant differences were observed between KRAS‐mt and KRAS‐wt specimens (Fig. S2E). Here, KRAS is linked to cancer.