Prognostic value of the nine-lncRNA signature in patients with oral and oropharyngeal squamous cell carcinoma. (A) Risk distribution map of patients arranged according to the risk score, and divided into low-risk and high-risk groups according to the median risk score. (B) Distribution of survival status revealing that patients in the high-risk group had higher mortality and a shorter survival time than those in the low-risk group. (C) Heat map of lncRNA expression revealing that the expression levels of AC099850.3, AP002884.1, UBAC2-AS1 and MIR600HG were higher in high-risk patients compared with in patients with low-risk, while the expression levels of AL512274.1, PTCSC2, LINC01963, RTCA-AS1 and AL354733.3 were lower in the high-risk patients compared with in patients with low-risk. lncRNA, long non-coding RNA.