PTCSC2 and head and neck squamous cell carcinoma: Meanwhile, PTCSC2 [35, 36], LINC02178 [37, 38], SRP14-AS1 [39], and MIR22HG [40, 41] have been mainly reported in other cancer types, such as head and neck squamous cell carcinoma, oral and oropharyngeal squamous cell carcinoma, and thyroid cancer.TMEM99 has not been reported previously.