Alternative Name(s): Cluster of Differentiation 20, APY, ATOPY, B lymphocyte antigen CD20


Test Description

CD20 is expressed on all stages of B cell development except the first and last; it is present from late pro-B cells through memory cells, but not on either early pro-B cells or plasma blasts and plasma cells. It is found on many B-cell lymphomas, hairy cell leukemia, B-cell chronic lymphocytic leukemia, but is absent on T-cell lymphomas.