Gastrointestinal Stromal Tumours Test

What is Gastrointestinal Stromal Tumors (GIST) Test?

The Gastrointestinal Stromal Tumors Test is a molecular diagnostic test designed to detect genetic mutations in KIT, PDGFRA, and other associated genes that drive GIST tumor growth. This test plays a crucial role in differentiating GIST from other mesenchymal tumors, guiding targeted therapy selection, and predicting treatment response to tyrosine kinase inhibitors (TKIs) such as imatinib. GIST testing helps oncologists determine tumor aggressiveness, prognosis, and drug resistance, ensuring personalised treatment strategies for improved patient outcomes.

Mutational Landscape of Gastrointestinal Stromal Tumors

Gene Mutation
KIT (75.0%) PDGFRA (10.0%) SDH-deficient (13.8%)
NF1 (0.5%) BRAF (0.5%) Other Mutations (0.2%)

Key Genetic Insights in Gastrointestinal Stromal Tumors

  • Mutations in KIT, PDGFRA & SDH genes are frequently observed in GIST patients.
  • GIST patients with KIT or PDGFRA mutations respond well to tyrosine kinase inhibitors (TKIs).
  • Exon 9 mutations in KIT show lower response rates compared to exon 11 mutations.
  • D842V mutation in PDGFRA does not respond to Imatinib but is treatable with Avapritinib.
  • GISTs lacking KIT/PDGFRA mutations should be tested for BRAF, NTRK, SDH, and FGFR mutations.
  • SDH-mutant GISTs resistant to Imatinib may benefit from Sunitinib or Regorafenib therapy.

Specifications

  • Indications: Gastrointestinal Stromal Tumors (GISTs).
  • Methodology: Next-Generation Sequencing (NGS).
  • Sample Type: FFPE tissue block with a minimum of 20% tumor content. The sample should be accompanied by an HPE report and an IHC report, or tissue preserved in RNA later.
  • Accuracy: Limit of detection is 5% variant allele frequency (VAF) for SNVs and InDels, and more than 10 spanning reads for fusions. The average depth of sequencing is greater than 250×.
  • Coverage: Single nucleotide variants (SNVs), insertions and deletions (InDels), and fusions.
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GIST Test Offered by MedGenome

Key Highlights of MedGenome's GIST Test

Comprehensive Mutation Coverage

Detects key SNVs, InDels, and Fusions in genes such as KIT, PDGFRA, SDH, BRAF, and NTRK, essential for precise diagnosis and targeted therapy selection.

Differentiates GIST Subtypes

Provides genetic insights to distinguish KIT/PDGFRA-mutant GISTs from SDH-deficient and other rare subtypes, which require distinct treatment strategies.

Predicts Drug Resistance & Response

Identifies mutations like D842V in PDGFRA, which are resistant to Imatinib but respond to Avapritinib, aiding in treatment optimisation.

What is Gastrointestinal Stromal Tumours (GIST Test)?

The Gastrointestinal Stromal Tumours (GIST) Test is a genetic test used to detect mutations in genes associated with GIST, a rare type of cancer that forms in the digestive tract. This test helps doctors identify genetic mutations that drive tumour growth, allowing for precise diagnosis and targeted treatment options. GISTs commonly occur in the stomach or small intestine and may not cause symptoms in early stages, making genetic testing crucial for early detection and better treatment outcomes.

How is Gastrointestinal Stromal Tumours Test Done?

Step Process Details
Sample Collection Tumour tissue biopsy A small piece of tumour tissue is obtained through a biopsy or surgical removal.
Genetic Analysis Laboratory testing The sample is analysed to identify mutations in specific genes like KIT, PDGFRA, and other related genes.
Results Interpretation Genetic evaluation A genetic specialist reviews the results to help doctors determine the most effective treatment plan.
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How Does Gastrointestinal Stromal Tumours Test Work?

The GIST test works by analysing the DNA of tumour cells to check for specific gene mutations that may be causing uncontrolled cell growth.

  • The test detects mutations in genes such as KIT, PDGFRA, and other related genes.
  • Identifies whether the tumour is likely to respond to targeted therapies like tyrosine kinase inhibitors (TKIs).
  • Helps doctors distinguish GIST from other similar tumours for a more accurate diagnosis.
  • Guides personalised treatment plans to improve patient outcomes and disease management.

Who Should Consider Gastrointestinal Stromal Tumours Testing?

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What Does Gastrointestinal Stromal Tumours Test Results Mean?

  • Mutation Detected: A genetic mutation was found in KIT, PDGFRA, or other genes, indicating the presence of GIST. Your doctor will use this information to determine the best treatment approach.
  • No Mutation Detected: No known mutations were found, but additional tests may be required to confirm the diagnosis.
  • Variant of Uncertain Significance (VUS): A genetic change was found, but its impact is unclear. Further analysis or follow-up testing may be needed.

How Often Should Gastrointestinal Stromal Tumours Test Be Performed?

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Why Choose MedGenome for GIST Testing?

  • Comprehensive Genetic Analysis: Detects key KIT, PDGFRA, and other gene mutations for precise diagnosis and treatment selection.
  • Accurate & Reliable Results: Utilises advanced genomic technology for highly sensitive and specific mutation detection.
  • Essential for Personalised Treatment: Helps doctors select the right targeted therapy, reducing unnecessary treatments.
  • Quick Turnaround Time: Delivers fast results, allowing doctors to initiate treatment promptly.
  • Trusted by Leading Hospitals & Oncologists: MedGenome follows international quality standards, ensuring clinically validated and reliable genetic testing.

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