RecruitingDiagnostic testAberrant Expression of CD56 in Patients With Hematologic Malignancies.CD56(cluster of differentiation 56) was found to be ectopically expressed in multiple myeloma . A met analysis indicated that CD56 over expression may be an adverse prognostic factor in AML. To the best of our knowledge, no available data the expression pattern of CD56 in other Hematologic malignancies. This work is designed to evaluate the expression pattern of CD56 in hematologic malignancies.