GSTM1 and head and neck squamous cell carcinoma: This analysis revealed GSTM1 as one of the top 50 most upregulated genes in BAA HNSCC vs. White HNSCC (Supplementary Fig. S10), and indicated that five pathways, including ‘metabolism of xenobiotics by cytochrome p450’ pathway, were the most upregulated pathways in BAA HNSCC compared with White HNSCC (Fig. 6A-B).