RPS9 and nasopharyngeal carcinoma: Four ribosomal proteins, uS8 (S8), uS4 (S9), eS31 (S27a), and uL14 (L23), were found to be differentially expressed in NPC cell lines compared with a nonmalignant nasopharyngeal epithelial cell line (NP69) (Sim et al., 2017).