CD99

CD99

a type I transmembrane protein present on thymocytes, lymphocytes, and myeloid cells involved in rosette formations with sheep erythrocytes.
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In the immunohistochemical analysis, the cells exhibited diffuse membranous positive staining with CD99 and vimentin, while cytokeratin was negative (Fig.
Immunohistochemistry revealed positive staining of the tumor cells for CD43 and myeloperoxidase (negative for CD20, CD79a, CD30, CD99, CD3, CD138, AE1/3 and Cam 5.
Expression of CD99 is shared by subsets of myeloid sarcoma and pediatric small blue cell tumors, perhaps contributing to confusion.
There was no staining for AE1 AE3, pancytokeratin, H-caldesmon, myogenin, CK 5/6, CK14, p63, 34BE12, CD34, CK7, CD56, EMA, S100, melan A, c-KIT and CD99.
The findings were of a "small round blue cell" tumour showing mesenchymal differentiation and immunohistochemical positivity for CD99, vimentin, Bcl-2, focal positivity for NSE together with glycogen found within the cytoplasm.
In immunochemistry, CK20 was strongly positive, SI00 was focally positive, and EMA was positive, while synaptophysin, chromogranin, vimentin, CD3, CD20, as well as CD45, and CD99 were all negative.
Hastadan alinan metastatik nodulun histopatolojik incelemesi; CD99 negatif, 6c1-2 pozitif monofazik synovial sarkom olarak geldi.
CD99 showed weak cytoplasmic staining, which is consistent with a primitive neural or neuroectodermal-type neoplasm.
Neoplastic cells were strongly positive for CD20 and negative for cytokeratin, desmin, CD79a, S100, and CD99.
The mass stained positive for CD99 and Bcl2, weakly positive for CD34 and smooth muscle actin, and negative for CD31 and EMA.
Positive immunostaining for Bcl-2 and CD99 is also observed in solitary fibrous tumors, but their presence is not uniform and positivity is often weak.