MSX1 was found to be overexpressed in cell lines derived from MCL and leukemia AML as well as in 3% of patients with MCL and AML.[23] In the present study, array CGH revealed a cryptic gain of MSX1 gene besides trisomy 12 and del(13q14.11-q21), which has not been reported previously in CLL. Here, MSX1 is linked to B-cell chronic lymphocytic leukemia.