CPT® Code 81314

PDGFRA (platelet-derived growth factor receptor, alpha polypeptide) (eg, gastrointestinal stromal tumor [GIST]), gene analysis, targeted sequence analysis (eg, exons 12, 18)

Molecular genetic testing is a critical procedure that focuses on identifying specific mutations within the PDGFRA (platelet-derived growth factor receptor, alpha polypeptide) gene. This testing employs targeted sequence analysis, particularly examining exons 12 and 18 located on chromosome 4. The PDGFRA gene plays a vital role in encoding a tyrosine kinase receptor protein, which is essential for the transmission of signals from the cell surface into the interior of the cell through a process known as signal transduction. This mechanism involves phosphorylation, which activates a series of proteins that are crucial for various cellular functions, including growth, proliferation, adhesion, migration, differentiation, and apoptosis. Mutations in the PDGFRA gene are predominantly linked to mesenchymal tumors, specifically gastrointestinal stromal tumors (GIST), which can occur in the stomach and small intestine. The purpose of conducting genetic testing for the PDGFRA gene is to pinpoint the exact mutation present in individuals diagnosed with cancer. This information is particularly important for assessing potential resistance to therapies such as imatinib or sunitinib, which are commonly used in the treatment of GISTs.