KDM4A and nasopharyngeal carcinoma: Furthermore, RT-qPCR and Western blot analysis showed that compared with the NP69 cell line, KDM4A was expressed at a higher level in four NPC cell lines (SUNE1, SUNE-2, 5–8 F and 6–10B); of these cell lines, SUNE1 cells exhibited the highest KDM4A expression and were thus selected for subsequent experiments (Fig. 1d, e).