Among the genes that mutated in more than one AM and mutually exclusive with the TCGA genes, we found 3 ARID1A mutations in TWT samples: p.Trp1670* and p.Glu1291Asp mutations reported as pathogenic variants in the Catalogue of Somatic Mutations in Cancer (COSMIC https://cancer.sanger.ac.uk/cosmic, accessed on 10 March 2021) and p.Thr1514Met unreported variant. This evidence concerns the gene ARID1A and cancer.