Analyses of TCGA human tumour datasets showed strongly positively correlated co-expression of PADI1 and PADI3 in multiple tumour types such as cutaneous melanoma, uveal melanoma, bladder, lung and head and neck, with PADI1 often being the gene showing strongest correlation with PADI3 (Supplementary Fig. 10a–f). This evidence concerns the gene PADI1 and cutaneous melanoma.