CPT® Code 81321

PTEN (phosphatase and tensin homolog) (eg, Cowden syndrome, PTEN hamartoma tumor syndrome) gene analysis; full sequence analysis

The CPT® Code 81321 refers to the full sequence analysis of the PTEN (phosphatase and tensin homolog) gene, which is crucial for identifying mutations associated with PTEN hamartoma tumor syndrome, commonly known as Cowden syndrome. This molecular genetic testing is essential for diagnosing individuals who may be predisposed to developing various tumors due to inherited mutations in the PTEN gene, located on chromosome 10. Cowden syndrome is characterized as an autosomal dominant condition, meaning that an individual only needs to inherit one mutated copy of the PTEN gene from a parent to manifest the disease. The PTEN gene encodes a protein that functions as a tumor suppressor, playing a vital role in regulating cell division, migration, and adhesion, as well as the formation of new blood vessels. Mutations in the PTEN gene can lead to a range of effects, from minor changes in the DNA sequence to significant deletions, which may result in a defective enzyme that fails to perform its tumor-suppressing functions effectively. This can lead to the development of multiple non-malignant tumors, which have a heightened risk of becoming cancerous, particularly in the breast, thyroid, and endometrial tissues. The full sequence analysis provided by CPT® Code 81321 is critical for understanding the genetic basis of this syndrome and guiding further clinical management and surveillance for affected individuals.