CTNNB1 and neoplasm: Whole genome sequencing allowed us to map interstitial deletions spanning intron 1 to exon 3/intron3 of CTNNB1. Interestingly, deletions occurred at similar regions in all four tumours leading to deletion of exon 2 and either whole (n = 1/4) or fractions of exon 3 (n = 3/4).