GAB2 is a member of the GRB2-associated binding protein family which act as adapter hubs transmitting signalling via cytokine and growth factor receptors, and T- and B-cell antigen receptors (definition from NCBI gene), while PAX2 inhibits the expression of the antimicrobial peptide beta defensin (DEFB1) [166], a gene associated with HSV-1 and cytomegalovirus seropositivity in children with acute lymphoblastic leukaemia [167], as well as with H. pylori or chlamydial infections [168, 169], also endowed with antimicrobial activity against C. neoformans and other pathogens [170]. This evidence concerns the gene GRB2 and acute lymphoblastic leukemia.