As shown in Figure 6(a), in the vehicle group, after 2 Gy irradiation (IR) for 48 h, the clonogenic survival of NPC cells was moderately decreased, while after NPC cells were transfected with TRAF2-shRNA, the survival of NPC cells dramatically declined (82% vs. 30%), suggesting the high expression of TRAF2 may be associated with the resistance to radiation. Here, TRAF2 is linked to nasopharyngeal carcinoma.