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Test ID: IH P57
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P57
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Immunohistochemistry Stain
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Useful For
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Aids in the identification of cytotrophoblasts, intermediate trophoblasts, and villous stromal cells in molar pregnancy.
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Method name and description
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- Mouse Monoclonal Antibody p57 (Kp10)
- Immunoperoxidase stain on formalin-fixed, paraffin-embedded (FFPE) tissue section
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Clinical information
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Anti-p57 has been used as an aid in discriminating complete hydatidiform mole (CHM) (no nuclear labeling of cytotrophoblasts or stromal cells) from partial hydatidiform mole (PHM) (nuclear staining of both cytotrophoblasts and stromal cells) and hydropic abortion. In normal placenta, cytotrophoblast, syncytiotrophoblast, and stromal cells are labeled with this antibody. Intervillous trophoblastic islands demonstrate nuclear labeling in all entities and serve as an internal control.
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Specimen type / Specimen volume / Specimen container
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- Specimen type: Well-fixed tissue in 10% neutral buffered formalin.
- Submit 2 unstained (3-4 µm thick) paraffin embedded tissue section mounted on a clean positively charged glass slide (sections to be cut within 6 weeks.) or formalin-fixed, paraffin-embedded (FFPE) tissue block.
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Storage and transport instructions
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- Slides or blocks are stored in cork box at room temperature away from sun light and any source of heat.
- Follow your local regulation shipping guidelines.
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Specimen Rejection Criteria
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- Broken slides
- Unlabeled slides with patient/case identification
- Contaminated slides
- Slides/paraffin blocks mismatch
- Uncharged slides
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Factors affecting test performance and result interpretation
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- Fixation time (FT)
- Fixative Type
- Storage time in paraffin
- Storage temperature
- Age of the cut sections
- Section thickness
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Turnaround time / Days and times test performed / Specimen retention time
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- Turnaround time for the test in platform: 3-4 hours
- Days and times test performed: Twice daily (Sunday to Wednesday)
- First batch: 0600H-1400H
- Second batch; 1230H - overnight
- Thursday (one batch only): 0600H-1400H
- Note: Request received after 1230H will be stained the following working day.
- Shelf-life of the paraffin section slides: ≤6 weeks
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