ABSTRACT A 39‐year‐old man was diagnosed with acute lymphoblastic leukaemia (B‐ALL) with SYNRG::ZNF384 and P2RY8::CRLF2 gene fusions. He was treated according to the GRAALL 2014 and underwent an allogeneic transplantation, achieving complete remission. Twenty‐five months later, he developed pancytopenia. The bone marrow examination showed blasts with an immunophenotype consistent with minimally differentiated acute myeloid leukaemia (AML M0). Although the P2RY8::CRLF2 fusion persisted, no molecular evidence of a lineage switch was detected. This rare presentation underlines the diagnostic challenges of acute leukaemias. The patient was finally treated with azacitidine and venetoclax.
Hervet et al. (Tue,) studied this question.