Tissue-Tek Genie®

Clone: EP169
Host clonality: rabbit monoclonal
Control tissue: tonsil, appendix, and B-cell neoplasms
Staining pattern: membraneous
Regulatory status: IVD, FDA Class I
Product code: 8516-C010: RTU, 10 capsules; 1 pack
8516-M250: RTU, 250 tests, 1 cartridge; 1 unit


CD19 regulates B-cell development, activation, and differentiation. CD19 is widely expressed from early pre-B-cells, normal B-cells, and normal plasma cells. Its expression on normal plasma cells is weaker than normal B-cells and a subpopulation may lack expression. CD19 is also expressed on follicular dendritic cells. CD19 is a specific and sensitive marker of B-cells and is found on the majority of B-cell neoplasms.
Tissue-Tek Genie<sup>&reg;</sup><br /> anti-CD19 Strong membraneous staining is seen on the neoplastic cells of this pre-B-cell acute lymphoblastic leukemia (pre-B ALL).

A moderate to strong membraneous staining pattern for CD19 is seen on the neoplastic cells in this B-cell CLL/SLL.

This particular example of a plasmacytoma shows no staining reaction for CD19.
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