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9 - Grade/differentiation unknown, not stated, or not applicable
The blasts in this leukemia have a translocation involving the mixed lineage leukemia (MLL) gene. High white blood cell counts are common.
(This code is effective for cases diagnosed 2010 and later. For cases diagnosed prior to 2010 see code 9801/3.)
This is a rare leukemia that is more common in children than in adults. Patients with B/myeloidleukemia with MLL translocations are often treated differently from patients diagnosed with ALL with MLL translocations, but there is no evidence that the difference in treatment is necessary or helpful.