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FLT3 Mutation Analysis
Test Code39786
CPT Codes
81245, 81246
Preferred Specimen
5 mL whole blood collected in an EDTA (lavender-top) tube or sodium heparin (green-top) tube OR 3 mL bone marrow
Minimum Volume
3 mL whole blood • 1 mL bone marrow • 25 uL extracted DNA
Other Acceptable Specimens
Cell pellet • 50 uL extracted Genomic DNA collected in a sterile, leak-proof container for a CLIA approved lab
Instructions
Do Not Reject. Send to lab for evaluation.
Submission of whole blood (preferred): Follow standard whole blood collection procedure. Collect 3-5 mL whole blood samples in EDTA tube. Blood samples are shipped at room temperature or 4° C. Do not freeze whole blood. Record the draw time and date on the tube. Ship immediately to maintain sample stability.
Cell Pellet Instructions: This assay is also designed for the remnant cell pellet from Cytogenetics. The cell pellet usually fixed should be transported refrigerated to the laboratory as soon as possible. Please provide a copy of the Cytogenetics report.
Submission of whole blood (preferred): Follow standard whole blood collection procedure. Collect 3-5 mL whole blood samples in EDTA tube. Blood samples are shipped at room temperature or 4° C. Do not freeze whole blood. Record the draw time and date on the tube. Ship immediately to maintain sample stability.
Cell Pellet Instructions: This assay is also designed for the remnant cell pellet from Cytogenetics. The cell pellet usually fixed should be transported refrigerated to the laboratory as soon as possible. Please provide a copy of the Cytogenetics report.
Transport Temperature
Whole blood, bone marrow, cell pellet: Refrigerated (cold packs)
Extracted DNA: Frozen
Extracted DNA: Frozen
Specimen Stability
Whole blood and bone marrow
Room temperature: 7 days
Refrigerated: 7 days
Frozen: Unacceptable
Extracted DNA
Room temperature: Unacceptable
Refrigerated: 5 years
Frozen: 5 years
Cell pellet
Room temperature: Unacceptable
Refrigerated: 30 days
Frozen: 30 days
Room temperature: 7 days
Refrigerated: 7 days
Frozen: Unacceptable
Extracted DNA
Room temperature: Unacceptable
Refrigerated: 5 years
Frozen: 5 years
Cell pellet
Room temperature: Unacceptable
Refrigerated: 30 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Do Not Reject
Methodology
Polymerase Chain Reaction (PCR)
Setup Schedule
Monday-Sunday Morning Report available: 3 Days
Reference Range
| FLT3 ITD | Not detected |
| FLT3 TKD | Not detected |
Clinical Significance
FLT3 (fms-like tyrosine kinase-3) is a receptor tyrosine kinase that plays a significant role in cell survival, proliferation, and differentiation of hematopoietic stem cells. Mutations of FLT3 represent one of the most frequent molecular mutations in acute myeloid leukemia (AML) and are reported in 25-30% of the patients. These mutations predominantly include FLT3 internal tandem duplications (ITD) which occur in the region of the gene encoding the Juxtamembrane region of the protein and point mutations in the tyrosine kinase domain (TKD). Patients with a high mutant allelic ratio (>0.5) are more likely to be responsive to FLT3 inhibition compared to those with low allelic ratio but also with poor prognosis due to high relapse risk. The TKD mutations most frequently involve mutation or deletion of codons D835 or I836. Both ITD and TKD mutations constitutively activate FLT3 kinase activity without the need for the ligand and hence promote malignancy. AML patients with FLT3 internal tandem duplication (ITD) mutations have poor prognosis, high relapse rates, and reduced overall survival. Patients with FLT3 mutations could be eligible for FLT3-targeted therapy regimens.
