PAX5 and leukemia: Not only have other MSI2 fusions been detected in patient leukemia samples (i.e., PAX5-MSI225, EVI1-MSI226, TTC40-MSI227), but we have found that MSI2 is also a frequent partner for an array of translocations in solid cancers including breast, lung and colon cancer28 (Supplementary Table 1).