CPT® Code 81322

PTEN (phosphatase and tensin homolog) (eg, Cowden syndrome, PTEN hamartoma tumor syndrome) gene analysis; known familial variant

The CPT® Code 81322 pertains to the molecular genetic testing of the PTEN (phosphatase and tensin homolog) gene, specifically focusing on known familial variants associated with conditions such as Cowden syndrome and PTEN hamartoma tumor syndrome. The PTEN gene, located on chromosome 10, plays a crucial role in regulating cell growth and division, acting as a tumor suppressor. In individuals with Cowden syndrome, which is inherited in an autosomal dominant manner, a mutation in the PTEN gene can lead to the development of multiple non-malignant tumors that have a predisposition to become cancerous, particularly in the breast, thyroid, and uterus. The mutations in the PTEN gene can vary significantly, ranging from minor changes in a few DNA building blocks (nucleotides) to larger deletions affecting substantial portions of the gene. These mutations can impair the function of the PTEN enzyme, leading to its defective activity or complete absence in cells, which contributes to tumorigenesis. The testing associated with CPT® Code 81322 is specifically designed to identify these known familial variants, which have been documented in patients with breast cancer, including variants such as -903GA, -975GC, and -1026CA. These variants are linked to aggressive tumor behavior and poor treatment outcomes, highlighting the importance of genetic testing in managing and understanding the risks associated with PTEN-related syndromes.