title: Mutational landscape of gingivo-buccal oral squamous cell carcinoma reveals new recurrently-mutated genes and molecular subgroups.
abstract: Gingivo-buccal oral squamous cell carcinoma (OSCC-GB), an anatomical and clinical subtype of head and neck squamous cell carcinoma (HNSCC), is prevalent in regions where tobacco-chewing is common. Exome sequencing (n=50) and recurrence testing (n=60) reveals that some significantly and frequently altered genes are specific to OSCC-GB (USP9X, MLL4, ARID2, UNC13C and TRPM3), while some others are shared with HNSCC (for example, TP53, FAT1, CASP8, HRAS and NOTCH1). We also find new genes with recurrent amplifications (for example, DROSHA, YAP1) or homozygous deletions (for example, DDX3X) in OSCC-GB. We find a high proportion of C>G transversions among tobacco users with high numbers of mutations. Many pathways that are enriched for genomic alterations are specific to OSCC-GB. Our work reveals molecular subtypes with distinctive mutational profiles such as patients predominantly harbouring mutations in CASP8 with or without mutations in FAT1. Mean duration of disease-free survival is significantly elevated in some molecular subgroups. These findings open new avenues for biological characterization and exploration of therapies.
authors.affiliation: National Institute of Biomedical Genomics, Netaji Subhas Sanatorium (2nd Floor), Kalyani 741251, India.
mesh_terms: D000328:Adult; D015820:Cadherins / Q000235:genetics; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000401:mortality; D053181:Caspase 8 / Q000235:genetics; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics* / Q000401:mortality; D009154:Mutation; D016159:Tumor Suppressor Protein p53 / Q000235:genetics
chemical_list: D015820:Cadherins; C502403:FAT1 protein, human; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; C505530:CASP8 protein, human; D053181:Caspase 8