WT1 and neoplasm: Segmental copy number loss was identified for WT1 (14 tumours, three showing loss of small segments containing all or part of WT1 and the remainder loss of the majority or all of chromosome 11) and WTX (19 tumours, 14 showing loss of small segments containing all or part of WTX and the remainder loss of the majority or all of the X chromosome) (Fig. 2, Supplementary Table 1).