DOCK4 and nasopharyngeal carcinoma: The results of RT‐qPCR revealed that the expression levels of DOCK4 (P < 0.05), MCM9 (P < 0.05), and POPDC3 (P < 0.05) were all significantly downregulated in the radioresistant NPC specimens when compared to those of the radiosensitive NPC specimens (Figure 6D‐F).