Background: The t(12;21)(p13;q22). which fuses ETV6 and RUNX1 genes. is the most common genetic abnormality in children with B-cell precursor acute lymphoblastic leukaemia. The implication of the fusion protein in leukemogenesis seems to be clear. https://www.bekindtopets.com/quick-find-Premio-Tab-7-1-limited-choice/