Mixed Phenotype Acute Leukemia, B/Myeloid

**Semantic type:** Neoplastic Process

**Definition:** A rare mixed phenotype acute leukemia in which the blasts express B-lymphoid and myeloid lineage markers but are negative for KMT2A rearrangement and t(9;22)(q34;q11.2) translocation. The prognosis is usually unfavorable.

**Synonyms:** - MPAL, B/Myeloid, NOS - Mixed Phenotype Acute Leukemia, B/Myeloid, NOS - Mixed Phenotype Acute Leukemia, B/Myeloid, Not Otherwise Specified - Mixed Phenotype Acute Leukemia, B/Myeloid, Not Otherwise Specified - Mixed Phenotype Acute Leukemia, B/Myeloid, Not Otherwise Specified - Mixed phenotype acute leukemia, B/myeloid, NOS