As with previous studies4–7, the mutation analyses revealed a small set of genes (TP53, KMT2D CDKN2A, PIK3CA, NOTCH1, and FAT1) as the most common targets for likely deleterious sequence mutations in immortal PPOL and HNSCC cell lines (Fig. 1). The gene discussed is NOTCH1; the disease is head and neck squamous cell carcinoma.