Significant relationships determined between KRAS exon 2 and mucinous morphology, PIK3CA and absence of perineural invasion, BRAF and tumor differentiation and localization, MSH3 and tumor diameter, and BRCA2 and absence of lymph node metastasis were findings that have contributed to the literature. This evidence concerns the gene BRCA2 and metastatic malignant neoplasm in the lymph nodes.