• Test Code:
    8500
  • Department:
    Cancer FISH
  • Test Synonyms:
  • CPT Code(s):
    88271 • 88275 • 88368 FFPE
Background:

Amplification and overexpression of MET have been reported in a variety of cancers, including lung, gastric, head and neck, and brain cancers.  FISH with a probe specific for the MET gene will detect amplification, which has been associated with poor clinical outcomes.1

Methodology:

FISH is performed on fresh bone marrow and peripheral blood, or sections of formalin-fixed, paraffin-embedded tumor tissue. Slides are prepared per standard protocols and 100-200 interphase cells are scored.

Specimen Requirements:

  • Bone Marrow:  Shortly before aspiration add 0.2 cc of Sodium Heparin (1,000 units/ml) to tube of transport medium (please contact lab to arrange for transport medium to be sent).  Add at least 1 cc of bone marrow aspirate to the tube and suspend well.  Allow no clots to form.
  • Peripheral blood: May be used if bone marrow is inaspirable and blasts (.5%) are present.  Send in Sodium Heparin tube.
  • Bone core biopsy: May also provide cells in cases where marrow is severely packed.  Send in transport medium with Sodium Heparin.
  • Lymph node or tumor: Tumor specimens of at least 0.5 cm3 (up to 3 inches in diameter) are immediately collected with sterile methods into closable containers with sterile transport medium.* Needle biopsies will be accepted, but are often difficult to grow.  Deliver the specimen in transport medium to the laboratory within a day, if possible, with decreased success rates as specimens are delayed in transit.  Protect sample from temperature extremes during shipping.

*Sterile Ringer’s solution, either lactated or non-lactated and sterile isotonic saline are alternatives, if no complete RPMI is available.  Contact Client Services for more information on media requirements.
It is preferable to collect the specimen before initiation of chemotherapy in the patient.  Tumor samples should be selected from viable areas, with as little normal or necrotic material as possible. 
Fluid samples (e.g., ascitic or pleural fluid) do not require culture medium for collection, but should be collected and transported aseptically. 
Unacceptable specimens are acellular, necrotic specimens, septic specimens, specimens in fixative or frozen, or specimens collected more than one week previously.

  • Formalin-fixed paraffin-embedded tumor block or FFPE slides:  Store at room temperature.
    • If sending slides, please include H&E stained slide cut from same block.
    • Preferred slice thickness is 4-5 micrometer on positively charged slides.
    • Please submit 3-5 slides.
    • Contact Client Services for more information.

A REQUISITION FORM MUST ACCOMPANY ALL SAMPLES. Please provide detailed clinical information.

Test Performed (Days):

Mon - Sat

Turn Around Time:

3-7 days

Shipment Sensitivity Requirements:

Ship via overnight express, using the FedEx priority overnight label provided.  Contact Client Services at (855) 535-1522 for shipping kits and instructions.

References:

  1. Cappuzzo F, et al: Increased MET gene copy number negatively affects survival of surgically resected non-small-cell lung cancer patients. J. Clin. Oncol.  27:1667-1674

Additional Info:

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