MPO and lymphoma: An additional subtype of T-lymphoblastic leukemia/lymphoma, early T-precursor lymphoblastic leukemia/lymphoma (ETP-ALL), corresponds to an early or minimal state of T cell differentiation, and expresses the T cell lineage-defining marker CD3 as well as myeloid and/or stem cell markers, but not the myeloid lineage-defining marker myeloperoxidase (<3% positive blasts) [25,26,27].