The fusion between two other adjacent genes KAT8 regulatory NSL complex subunit 1 (KANSL1) and ADP-ribosylation factor-like 17 A/B (ARL17A), both at the reverse strand of chromosome 17, was identified in tumour 521 (a cortical T-LBL in a paediatric male patient) and in the two normal thymuses (404 and 405). This evidence concerns the gene KANSL1 and neoplasm.