A recent in silico study reported that the expression of TMPRSS2 was low in different cancers, such as colon adenocarcinoma, head and neck squamous cell carcinoma, breast invasive carcinoma, kidney renal papillary cell carcinoma, ccRCC, rectum adenocarcinoma, lung cancer, liver hepatocellular carcinoma, skin cutaneous melanoma, stomach adenocarcinoma and others [55]. Here, TMPRSS2 is linked to head and neck squamous cell carcinoma.