To expand upon findings from the gene expression profiling analysis, comparisons were made between the authentic EBV-positive NPC cell line, C666-1, and OKF6, a telomerase-immortalised oral keratinocyte cell line; the latter was used as a suitable control given its sensitivity to TGFβ1-mediated cell growth suppression [51]. The gene discussed is TGFB1; the disease is nasopharyngeal carcinoma.