CD34 and leukemia: In particular, we observed a high prevalence of CD10+/CD34+/CD66+ B-ALL likely to be associated with t(9;22), and CD10+/CD34– B-ALL leukaemias, at least some of which have been associated with t(1:19) translocations.15 Thirdly, myeloid markers were preferentially expressed on T-ALL leukaemias with the most immature phenotypes.