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Ph1‐chromosome positive acute lymphoblastic leukemia: Is t(9;22) the initial abnormality?

We report a case of pre‐B‐cell acute lymphoblastic leukemia (ALL) with the Ph1‐chromosome, t(9;22) translocation and P190 associated BCR/ABL rearrangement. One cell with the Ph1‐chromosome and t(9;22) also had del(5q). Interestingly, another diploid cell with iso(17q) lacked the Ph1‐chromosome and t(9;22). This finding, similar to one reported in chronic myelogenous leukemia, is consistent with the possibility that abnormality manifest as chromosome instability antedates the Ph1‐chromosome and t(9;22) in some cases of Ph1‐chromosome positive acute leukemia.