BCR-ABL fusion, TEL-PDGFRβ fusion, FLT3 internal tandem duplication mutation, and JAK2 V617F mutation are all known to contribute to leukemia while FGFR3 mutations are frequently observed in multiple myeloma (Blume-Jensen and Hunter, 2001; Levis and Small, 2003; Renneville et al., 2008). Here, ABL1 is linked to leukemia.