Within KRAS mutation subgroups, cetuximab plus chemotherapy versus chemotherapy alone significantly improved PFS (median, 7.4 versus 6.0 M, HR = 0.47, p = 0.039) and tumor response rate (41% versus 22%, odds ratio, OR = 3.38, p = 0.042) in patients with KRASG13D mutant tumors. Here, KRAS is linked to neoplasm.