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Published on: February 22, 2019
CD49f protein expression varies among genetic subgroups of B lymphoblastic leukemia and is distinctly low in
Katrina Collins1, Jolene L Cardinali1, Laila O Mnayer1
1Department of Pathology & Laboratory Medicine, Hartford Hospital, Hartford, Connecticut.
Background:
CD49f (integrin α6) is a useful marker for minimal residual disease (MRD) detection in B lymphoblastic leukemia and has recently been suggested to mediate infiltration of the central nervous system by leukemic B lymphoblasts. However, data regarding expression of CD49f protein in B lymphoblastic leukemia are limited, and whether CD49f protein expression varies among genetic subgroups of B lymphoblastic leukemia is unknown.
Methods:
CD49f protein expression was characterized by flow cytometry in a series of 40 cases of B lymphoblastic leukemia, which included the genetic subgroups: KMT2A-rerranged, BCR-ABL1+, ETV6-RUNX1+, hypodiploidy, and hyperdiploidy.
Results:
Expression of CD49f differed significantly among the five genetic subgroups studied, whether assessed by percentage of blasts positive for the antigen (p = .0001, Kruskal-Wallis) or median fluorescence intensity (MFI) (p = .0001, Kruskal-Wallis). Moreover, the percentage of CD49f+ blasts and MFI of CD49f were significantly lower in KMT2A-rearranged cases than in cases without KMT2A rearrangement (p = .0002 for both, Mann-Whitney).
Conclusions:
CD49f protein expression varies among genetic subgroups of B lymphoblastic leukemia, and is distinctly low in KMT2A-rearranged cases.
