EIF4A2 and head and neck squamous cell carcinoma: The expression of three of the genes from the analysis, EIF4A2, JOSD3 and RPL37 was further explored by qPCR at different oxygen concentrations, presenting the relative expression levels normalized to the control sample (21%O2 at pH 7.5), in four different HNSCC cell lines (SiHa, FaDuDD, UTSCC5 and UTSCC33) as shown in Fig 3A.