In research carried out in vitro to analyze the consequences of exposure to permethrin em ETV6-RUNX1 and IGH-BCL2 genes in K562 cells (chronic myeloid leukemia cells), induction was found of breakage and fusion of the damaging genes associated with lymphoma development (71). This evidence concerns the gene BCL2 and chronic myelogenous leukemia, BCR-ABL1 positive.