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Alternate Test Names:
MALT1 (18q21) positive Reflex Panel test
The t(11;18)(q21;q21), which juxtaposes the MALT1 gene located on chromosome 11q21 with the API2 (also known as BIRC3) gene on 18q21, is detected in approximately 10-20% of patients with extranodal low grade marginal zone B-cell lymphomas of MALT type (i.e., MALT lymphomas) and is particularly prevalent in those of gastric (20-30%) and lung (~50%) origin. It is of particular clinical import as patients with t(11;18)(q21;q21)-positive gastric MALT lymphomas do not respond to Helicobacter pylori eradication therapy, are associated with more advanced-stage disease, and usually do not show transformation to large cell lymphoma.
Probe type: Dual color, dual fusion translocation
CPT Code(s): 88374 (reference only; CPTs may vary)
Turnaround Time: Within 3-4 business days of receipt
Schedule: Monday - Friday
• Formalin-fixed, paraffin-embedded tissue block or cell block - OR -
• Minimum of 5 unstained slide cut at 4µm for each test requested