What tests are useful for pancreatic cancer

Essential Tests for Pancreatic Cancer

Based on NCCN Guidelines for Patients: Pancreatic Cancer, there's a comprehensive testing pathway that every person with pancreatic cancer should undergo. Let me break down what's considered standard care:

Core Diagnostic & Staging Tests

1. Imaging Tests (Critical for Treatment Planning)

Pancreatic Protocol CT or MRI - This is the foundation:

• A specialized CT scan that takes pictures before contrast and multiple times after contrast
• Or an MRI with a pancreatic protocol (may show small tumors CT misses)
• These protocols are specifically designed to show cancer in and around the pancreas
• Why it matters: This determines if surgery is even possible by showing exactly where the tumor has grown

Additional imaging if metastatic cancer wasn't found:

• CT scan of chest and pelvis
• MRI of the liver (if CT doesn't clearly show spread)
• PET/CT scan (not routine, but helpful for some people)

2. Biopsy (Confirming Cancer)

When you need it: Before starting chemotherapy or other drug treatment

• EUS-guided biopsy (endoscopic ultrasound-guided) - preferred method
• Imaging-guided needle biopsy - alternative approach through the skin
• Important note: If surgery is your first treatment, the biopsy can be done during surgery to spare you an extra procedure

3. Blood Tests

Liver function tests:

• Measure proteins, enzymes, and bilirubin (the chemical that makes bile yellow)
• Abnormal levels may indicate blocked bile ducts or cancer spread to the liver

CA 19-9 tumor marker:

• A protein made by pancreatic cancer cells
• High levels often mean advanced cancer stage
• Limitation: Can't diagnose cancer alone (other conditions cause high levels, and some people with pancreatic cancer have normal levels)
• Used to track treatment response over time

Tests for Personalized Treatment (CRITICAL - Often Overlooked)

4. Genetic Testing for Inherited Mutations

According to NCCN Guidelines: "All people with pancreatic cancer should get genetic tests"

What they're looking for:

• BRCA1, BRCA2 (breast cancer genes) - linked to breast, ovarian, prostate cancers
• ATM - linked to breast, bladder cancers and melanoma
• PALB2 - linked to breast cancer
• Lynch syndrome genes (MLH1, MSH2, MSH6, PMS2) - linked to colon, ovarian, uterine cancers
• Others: CDKN2A, STK11, TP53

Why this matters for treatment: Some treatments work specifically for certain inherited mutations. For example, olaparib (Lynparza) is FDA-approved for pancreatic cancer with germline BRCA mutations.

Sample needed: Blood or saliva

5. Biomarker Testing (Molecular Profiling)

For advanced and metastatic pancreatic cancer, tumor tissue should be tested for:

Gene fusions:

• NTRK fusion → Treated with entrectinib (Rozlytrek) or larotrectinib (Vitrakvi)
• RET fusion → Treated with selpercatinib (Retevmo)

Gene mutations:

• BRAF V600 mutation → Treated with dabrafenib (Tafinlar) + trametinib (Mekinist)
• BRCA1, BRCA2, PALB2 mutations → Treated with rucaparib (Rubraca)

Gene amplifications:

• HER2 amplifications (being studied for pancreatic cancer)

Immune system markers:

• Microsatellite instability (MSI) or mismatch repair deficiency (dMMR) → Treated with pembrolizumab (Keytruda) or dostarlimab-gxly (Jemperli)
• Tumor mutational burden (TMB-high) → May qualify for immunotherapy

Testing method: Next-generation sequencing (NGS) on tumor tissue (preferred) or blood sample

Additional Tests That May Be Needed

6. Endoscopic Tests (Not routine, but sometimes necessary)

• Endoscopic ultrasound (EUS): Can confirm where the tumor has grown
• ERCP (endoscopic retrograde cholangiopancreatography): Mostly for treating blocked bile ducts
• Laparoscopy: If imaging suggests metastatic cancer but didn't clearly show it

Questions to Ask Your Care Team

To ensure you're not missing critical tests:

1. "Have I had a pancreatic protocol CT or MRI scan?" (Not just a regular CT)

2. "Has my tumor been tested for genetic mutations like BRCA1, BRCA2, and PALB2?" (This is germline testing - what you inherited)

3. "Has my tumor tissue been sent for molecular profiling or next-generation sequencing?" (This finds acquired mutations that developed during your lifetime)

4. "Have we tested for actionable biomarkers like NTRK fusions, RET fusions, BRAF mutations, or microsatellite instability?"

5. "Should I see a genetic counselor about my test results and family history?"

6. "Are my bile ducts clear before doing blood tests?" (Blocked ducts affect test accuracy)

7. "Do I need any additional imaging to check for cancer spread?"

Why This Comprehensive Testing Matters

According to the NCCN Guidelines: "Because of molecular biomarkers, a treatment that helps one person might not help you."

The testing pathway determines:

• Whether surgery is possible (imaging)
• Which chemotherapy regimen to use (genetic testing)
• Whether you qualify for targeted therapies (biomarker profiling)
• Your family's cancer risk (germline mutations)
• How to monitor treatment response (CA 19-9 levels)

Important Timing Note

• Genetic testing and biomarker profiling: Should be done at diagnosis
• Biomarker testing: Currently recommended for advanced and metastatic disease
• Blood tests: Must be done when bile ducts are clear (not blocked)
• Repeat CA 19-9: After treatment to track response

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This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.

Your oncologist will determine which specific tests are most appropriate for your individual case based on your cancer stage, overall health, and treatment goals. If you haven't had some of these tests, especially the genetic and biomarker testing, ask your care team if they should be ordered.