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HelpTest Code MESOP Mesothelioma Panel (WT1/KRT5/TTF1/pCEA) Immunostain, Technical Component Only
Ordering Guidance
This test includes only technical performance of the stain (no pathologist interpretation is performed). If diagnostic consultation by a pathologist is required order PATHC / Pathology Consultation.
Shipping Instructions
Attach the green pathology address label and the pink Immunostain Technical Only label included in the kit to the outside of the transport container.
Specimen Required
Specimen Type: Tissue
Supplies: Immunostain Technical Only Envelope (T693)
Container/Tube: Immunostain Technical Only Envelope
Preferred:
-Formalin-fixed, paraffin-embedded tissue block
OR
-2 Unstained, positively charged glass slides (25- x 75- x 1-mm) per test ordered; sections 4-microns thick
Acceptable: None
Useful For
Differentiation of mesothelioma and  non-small cell lung cancer
Additional Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| IHMTO | IHC Multiplex, Tech Only | No | Yes |
Testing Algorithm
For the technical component only immunohistochemical (IHC) multiplex stain performed, the appropriate bill-only test ID will be reflexed and charged (IHMTO).
Method Name
Immunohistochemistry (IHC)
Reporting Name
WT1/KRT5/TTF1/pCEA IHC, Tech OnlySpecimen Type
TECHONLYSpecimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| TECHONLY | Ambient (preferred) | ||
| Refrigerated | |||
Reject Due To
| Wet/frozen tissue Cytology smears Nonformalin fixed tissue Nonparaffin embedded tissue Noncharged slides ProbeOn slides Snowcoat slides |
Reject |
Clinical Information
The Mesothelioma Panel assay consists of 4 antibodies WT-1, KRT5, TTF1 (clone SPT24) and P-CEA. This multiplex immunohistochemistry assay is used in the differential diagnosis of mesothelioma and non-small cell lung cancer (NSCLC). WT-1 (nuclear; detected with green chromogen) and KRT5 (cytoplasmic; detected with purple chromogen) are biomarkers expressed in mesothelioma. TTF1 (nuclear; detected with red chromogen) and P-CEA (membranous/cytoplasmic; detected with teal chromogen) are biomarkers expressed in NSCLC.
Interpretation
This test does not include pathologist interpretation only technical performance of the stain. If interpretation is required order PATHC / Pathology Consultation for a full diagnostic evaluation or second opinion of the case.
The positive and negative controls are verified as showing appropriate immunoreactivity and documentation is retained at Mayo Clinic Rochester. If a control tissue is not included on the slide, a scanned image of the relevant quality control tissue is available upon request. Contact 855-516-8404.
Interpretation of this test should be performed in the context of the patient's clinical history and other diagnostic tests by a qualified pathologist.
Cautions
Age of a cut paraffin section can affect immunoreactivity. Stability thresholds vary widely among published literature and are antigen dependent. Best practice is for paraffin sections to be cut within 6 weeks.
Avoid prolonged exposure of slides to light as this can cause the chromogens to fade over time. This fading can be mitigated by storing your slides in the dark when not being observed under the microscope.
The charge of glass slides can be affected by environmental factors and subsequently may alter slide staining. Sending unsuitable glass slides can result in inconsistent staining due to poor slide surface chemistry.
Best practices for storage of positively charged slides:
-Minimize time slides are stored after being unpackaged
-Limit exposure to high humidity and heat
-Minimize exposure to plastics
Day(s) Performed
Monday through Friday
Report Available
1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
88344-TC
LOINC Code Information
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 620228 | WT1/KRT5/TTF1/pCEA IHC, Tech Only | No LOINC Needed |
Forms
If not ordering electronically, complete, print, and send a Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request (T763) with the specimen.