Histopathological and immunohistochemical analysis revealed that the axillary cutaneous tumor showed adenocarcinoma and the same expression pattern for cytokeratin 7, cytokeratin 20, and CDX2 as the ascending colon cancer, and that proved to be KRAS–NRAS wild type, MSI-H, and with a BRAF V600E mutation. This evidence concerns the gene KRAS and ascending colon cancer.