CD34 and acute lymphoblastic leukemia: The CD10+/CD34+/CD66c– B-ALL subtype has been shown to be correlated with the t(12;21) translocation, which is the most common aberration in paediatric B-ALL, and which carries a good prognosis.29 In our cohort, the prevalence of this phenotype was low (10%), but our cohort was primarily composed of adult and adolescent leukaemia cases, so this lower frequency would be expected.17