CPT® Code 81297

MSH2 (mutS homolog 2, colon cancer, nonpolyposis type 1) (eg, hereditary non-polyposis colorectal cancer, Lynch syndrome) gene analysis; duplication/deletion variants

The CPT® Code 81297 pertains to the molecular genetic testing of the MSH2 gene, specifically focusing on the analysis of duplication and deletion variants. The MSH2 gene is crucial in the context of hereditary non-polyposis colorectal cancer (HNPCC), also known as Lynch syndrome, which significantly increases an individual's risk of developing colorectal cancer and other associated malignancies. Located on chromosome 2, the MSH2 gene is part of a protein complex that plays a vital role in the DNA repair process. This complex identifies errors that occur during DNA replication and facilitates their correction, thereby preventing the accumulation of mutations that can lead to tumor formation. Individuals with mutations in the MSH2 gene may not only face a heightened risk of colorectal cancer but also other cancers, including those of the endometrium, ovaries, prostate, stomach, small intestine, liver, gallbladder duct, upper urinary tract, brain, and skin. The identification of these mutations is critical for early intervention and management of cancer risk. The testing process for MSH2 gene mutations includes various methodologies, such as full sequence analysis and familial variant analysis, which help in identifying specific mutations and their implications for family members. In particular, the analysis for deletion and duplication variants, as indicated by CPT® Code 81297, is essential for understanding the genetic landscape of HNPCC, as it can reveal significant alterations in the number of gene copies, which are indicative of potential cancer risks.