Friend leukemia integration (FLI1) is a nuclear transcription factor and has been reported as the first nuclear marker of endothelial differentiation. FLI1 labels hemangiomas, angiosarcomas, Kaposis sarcoma, Ewings and Merkel cell carcinoma.
FLI1 is expressed in normal endothelial cells, megakaryocytes, normal breast epithelia.
- A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen type
- One (1) unbaked, unstained slide for H&E staining (required) and two to three (2-3) positively charged unstained slides (all cut at 4-5 microns) for each test/antibody ordered
- Block and slide identifiers should be clearly written and match exactly with the specimen ID and specimen labeling as noted on the requisition.
Use cold pack for transport. Make sure cold pack is not in direct contact with specimen.