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Overall survival according to expression of HLA class II and HLA class I/β2 microglobulin in patients with adult T-cell leukemia/lymphoma. The patients with adult T-cell leukemia/lymphoma were stratified into four groups according to human leukocyte antigen (HLA) class II and HLA class I/β2 microglobulin (β2M) expression. Differences in overall survival among the four groups are shown in the Kaplan–Meier plot (P=0.0013; log-rank test).
