Previous studies have also shown high concordance for blood and tissue alterations, such as those in the KRAS, NRAS, APC, and BRAF genes, in colorectal cancer (Grasselli et al., 2017; Gregg et al., 2018; Kato et al., 2019; Mardinian et al., 2019). The gene discussed is KRAS; the disease is colorectal cancer.