TNFRSF12A and head and neck squamous cell carcinoma: In non-tumor cells (normal cells) of HNSCC samples, no correlation between TNFRSF12A and SNAI2 was found (R = 0.0035); however, a relatively high correlation between TNFRSF12A and SNAI2 was found (R = 0.57) in HNSCC tumor cells (Figure 5G).