- Colorectal Cancer Screening
- Hereditary Nonpolyposis Colorectal Cancer, Screening
- Mismatch Repair Defect
- Replication Repair (RER)
Identify tumors with microsatellite instability. High-frequency microsatellite instability (MSI-H) is associated with Lynch syndrome, but it is also found in 15% to 20% of sporadic colorectal and endometrial cancers. Lynch syndrome is an autosomal-dominant inherited cancer syndrome that predisposes to colorectal, endometrial, gastric, ovarian, upper urinary tract, and other cancers.
One paraffin-embedded tumor and either whole blood or paraffin-embedded normal tissue
Eight unstained slides at 5 μM and one matching H&E slide or FFPE tissue block or 3-5 mL whole blood. Samples with ≥4 mm² tumor and normal tissue surface area and ≥50% tumor content are preferred.
FFPE tissue block or slides, lavender-top (EDTA) tube, or green-top (sodium heparin) tube
Blocks and slides at room temperature; whole blood at 2°C to 8°C
Tumor block containing insufficient tumor tissue or no tumor; broken or stained slides. Whole blood: Contaminated specimen; frozen whole blood received; leaking tube; clotted blood; hemolysis; specimen containing suspicious foreign material; quantity not sufficient for analysis