KMT2A and neoplasm: At this time point the tumors were of similar sizes (tumor cross-sectional area was 9.6 ± 2.0 mm2 for AT1- and 12 ± 4.3 mm2 for MLL-tumors, p = 0.26, n = 8 in each group) and were still surrounded by histologically benign normal prostate tissue (the tumors occupied roughly 30% of the prostate lobe volume) (Fig 1).