Alternative Name
TP53 Gene Sequencing
Methodology
Molecular
Test Description
Bi-directional sequencing of TP53 exons 4-9.
Clinical Significance
The TP53 gene encodes the tumor suppressor p53. TP53 mutations are detected in at least 50% of all adult tumors and are generally associated with a poor prognosis. For patients with chronic lymphocytic leukemia (CLL), TP53 sequencing, in addition to FISH for 17p deletion, aids in prognosis and/or therapy selection. Germline mutations in TP53 are the cause of Li-Fraumeni Syndrome.
Specimen Requirements
- Peripheral blood: 5 mL in EDTA tube.
- Bone marrow: 2 mL in EDTA tube.
- FFPE solid tumor tissue: Paraffin block is preferred. Alternatively, send 1 H&E slide plus 5-10 unstained slides cut at 5 or more microns. Please use positively-charged slides and 10% NBF fixative. Do not use zinc fixatives.
Note: Test is DNA-based. Please select Extract & Hold - DNA if specimen hold service is desired.
Storage & Transportation
Use cold pack for transport, making sure cold pack is not in direct contact with specimen. Ship same day as drawn whenever possible; specimens <14 days old acceptable.
CPT Code(s)*
81352 (as of 01/01/2021); Prior to CPT Code was 81405
Turnaround Time
7 days
Level of Service
Global
New York Approved
No