KMT2A and axial length measurement: In addition to detecting KMT2A-r, the KMT2A probe can detect the copy number variation (CNV) of KMT2A. However, we are unaware of any studies that aimed to elucidate the value of the FISH technique in the identification of both rearrangement and numerical abnormality of KMT2A. In this study, FISH analysis of KMT2A was performed in each newly diagnosed adult patient with AL at a single institution.