Pdgfra Mutation Analysis - Gist (Qualitative)

Function

This molecular test analyzes the PDGFRA (Platelet-Derived Growth Factor Receptor Alpha) gene for mutations in patients with Gastrointestinal Stromal Tumors (GIST). PDGFRA mutations are found in approximately 5-10% of GIST cases, particularly those that are negative for KIT mutations.

Why it is Ordered

Identifying the specific mutation is critical for determining the prognosis and selecting the most effective targeted therapy. For instance, the D842V mutation in PDGFRA is notoriously resistant to standard imatinib therapy but may respond to newer drugs like avapritinib.

Associated Conditions

• Gastrointestinal Stromal Tumors (GIST): Specifically those occurring in the stomach (where PDGFRA mutations are most common).
• Precision Medicine: Used to guide the use of Tyrosine Kinase Inhibitors (TKIs).

Impact on Treatment

Knowing the mutation status allows oncologists to avoid ineffective treatments and move directly to therapies that target the specific molecular driver of the tumor.