Childhood Early T Cell Precursor Acute Lymphoblastic Leukaemia with t(12;17) (p13;q21) Translocation - A Rare Entity or Part of ETP/Myeloid Mixed Phenotype Acute Leukaemia.

The translocation t (12;17) (p13; q21) is a rare cytogenetic event most commonly described in pre-B- acute lymphoblastic leukaemia and acute myeloid leukaemia. We identified a child with an immunophenotype of Early T Cell Precursor Acute Lymphoblastic Leukaemia ETP- ALL having t (12;17) (p13; q21) translocation as the primary karyotypic anomaly. The association of t (12;17) (p13; q21) with ETP-ALL has not been described previously in literature. The possibility of it being a novel genetic abnormality or a part of the newly described entity of ETP/myeloid MPAL is being discussed. Detection of such abnormalities can alter the prognosis of ETP-ALL. Key words: ETP-ALL , t(12;17) (p13;q21) translocation, ETP- MPAL.