Several genes are commonly associated with an increased risk of cancer. These include: - BRCA1 and BRCA2: Mutations in these genes significantly increase the risk of breast and ovarian cancers. - TP53: Mutations in this gene are linked to various cancers, including breast, lung, and colorectal cancers. - MLH1, MSH2, MSH6, and PMS2: Mutations in these genes are associated with Lynch syndrome, which increases the risk of colorectal and other cancers.