Here, we found concordance in the mutation status of KRAS in 105 of 106 cases (Figure 1) and were able to show that the only case of discordance was due to a tumor mosaic or the coexistence of multiple primary tumors (Figure 2), a fact that could help in explaining the partially contradicting results reported in the past [13, 17]. The gene discussed is KRAS; the disease is neoplasm.