TP53 and head and neck squamous cell carcinoma: Comparative genomic analyses of parent tumor, cell lines at early passage (ITOC-01: P-10, ITOC-02: P-8, ITOC-03: P- 12, ITOC-04: P-9), cell lines at late passage (ITOC-01: P-51, ITOC-02: P-48, ITOC-03: P-58, ITOC-04: P-57) and xenograft tumors was performed by evaluating TP53 mutational status, the most frequently mutated gene in HNSCC and which is also found to be mutated in all 4 OSCC cell lines (Supplementary Fig. S5).