GIST Panel Test: Booking, Price, and Results

The GIST panel test is a specialised laboratory investigation used to diagnose gastrointestinal stromal tumours (GISTs), which are the most common mesenchymal tumours of the digestive tract. The test uses a technique called immunohistochemistry (IHC), where specific antibodies are applied to a tissue sample to detect the presence or absence of key proteins on tumour cells. It is also known as the GIST IHC panel or gastrointestinal stromal tumour immunohistochemistry panel. A tissue biopsy sample is required for this test.

A doctor may order the GIST panel test when a patient presents with symptoms or imaging findings suggesting a tumour in the gastrointestinal tract. The panel helps confirm whether the tumour is a GIST and distinguishes it from other look-alike conditions.

Common Symptoms That May Require This Test

The following symptoms may prompt a doctor to investigate for GIST:

• Persistent abdominal pain or discomfort
• Blood in stools or vomiting blood
• Unexplained fatigue and weakness caused by low red blood cell count
• Nausea, bloating, or feeling full quickly after eating
• Unexplained weight loss
• A palpable lump or mass in the abdomen

Conditions This Test Can Help Detect

This panel is used to identify or distinguish between the following conditions:

• Gastrointestinal stromal tumours arising in the stomach, small intestine, colon, rectum, or oesophagus
• Leiomyoma and leiomyosarcoma (benign and malignant smooth muscle tumours)
• Schwannoma (a nerve sheath tumour)
• Other spindle cell or mesenchymal tumours of the gastrointestinal tract

Here is how the GIST panel test procedure typically works from biopsy to result:

1. A biopsy is performed by a specialist. This may involve an upper endoscopy, an endoscopic ultrasound-guided fine needle aspiration (EUS-FNA), a CT-guided core needle biopsy, or surgical excision, depending on the tumour's location.
2. The collected tissue is placed in a formalin solution to preserve it. It is then embedded in a paraffin block for processing.
3. Thin sections are cut from the paraffin block and mounted on glass slides.
4. A pathologist applies specific antibodies to the slides. The antibodies bind to their target proteins and produce visible colour staining.
5. The stained slides are examined under a microscope. The pathologist assesses the intensity and extent of staining for each marker.
6. A detailed pathology report is prepared and sent to your doctor within the stated turnaround time.

Results from the GIST panel test should always be reviewed with a qualified doctor, as interpretation depends on the full clinical context. The table below outlines the expected pattern of markers in GISTs compared to other tumour types:

These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.

Results During Special Conditions

Certain situations can make result interpretation more complex:

• Patients who have already received tyrosine kinase inhibitor therapy may show reduced or absent expression of CD117 and DOG1, which can make it harder to confirm recurrent or persistent disease on a repeat biopsy.
• Poorly fixed or degraded tissue samples may produce false-negative results across multiple markers, so sample quality is critical to accurate reporting.

The GIST panel test cost at Lupin Diagnostics starts at ₹22,400. This test requires a visit to a Lupin Diagnostics centre or submission of a biopsy block through your treating doctor. Home collection is not available for this test, as it requires a tissue sample obtained through a clinical biopsy procedure.

Prices are indicative and may vary by location. Please confirm the current price at the time of booking.