Of the 15 most recurrently mutated genes in ≥10% of HNSCC or GB-SCC tumours as reported in the TCGA and ICGC database (TP53, FAT1, CASP8, NOTCH1, KMT2B, PCLO, UNC13C, SMG1, FAT3, EP300, KMT2D, SYNE2, TRPM3, PIK3CA and NSD1), 12 were mutated in one or more of the ITOC cell lines (Fig. 5A,B and Supplementary Table S5). The gene discussed is SMG1; the disease is head and neck squamous cell carcinoma.