Diagnostic Tests

Cd 79A Immunohistochemistry Biopsy Tissue


Cd 79A Immunohistochemistry Biopsy Tissue

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What is this test?

CD79a stains the cytoplasm and membrane of B lymphocytes and megakaryocytes. CD79a is a protein expressed on the surface of B lymphocytes at all stages of maturation, from B-lymphocyte precursors through plasma cells. Its function is to transduce the signal of antigen binding to immunoglobulin into the cytoplasm of the B lymphocyte initiating intracellular signaling. Antibodies to CD79a are diagnostically useful to demonstrate B cell lineage of acute lymphoblastic leukemia, malignant lymphomas and chronic lymphoproliferative disorders. CD79 is composed of CD79a and CD79b components expressed almost exclusively on B cells and B-cell neoplasms. CD79a and CD79b expression precedes immunoglobulin (Ig) heavy-chain gene rearrangement and CD20 expression during B-cell ontogeny and disappears later than CD20 in the late (plasma cell) stage of B-cell differentiation. Therefore, antibodies to CD79a and CD79b are useful in the differential diagnosis of B-cell neoplasms from T-cell neoplasms or myeloid neoplasms, or L and H lymphocyte predominance Hodgkin's lymphoma from classic Hodgkin's lymphoma. In addition, CD79a and CD79b antibodies are useful markers in the diagnosis of precursor B-acute lymphoblastic leukemia (pre-B-ALL) because many of these tumors are negative for other B-cell markers, such as CD20 and CD45RA. Furthermore, for B-cell neoplasms, wherein CD20 expression is aberrantly lost, such as in diffuse large B-cell lymphoma, or for B-cell neoplasms after CD20-antibody therapy, CD79a may be used as a first-line B-cell marker for the diagnosis.

Also known as IHC Marker CD 79A Immunohistochemistry Biopsy Tissue, CD 79a Count Immunohistochemistry Biopsy Tissue.

Test Preparation

No special preparation is needed for Cd 79A Immunohistochemistry Biopsy Tissue. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing Cd 79A Immunohistochemistry Biopsy Tissue. Your doctor depending on your condition will give specific instructions.

Understanding your test results

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UNISEXAll age groupsTest is positive if the conditions listed are detected
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