For the control groups of the healthy controls and pathological samples, the estimated pooled frequency of 30-bp del-LMP1 was 46% (95% CI: 33 to 58, P = 0.00) and 39% (95% CI: 31 to 47, P = 0.49) (Additional file 5), respectively, that is, both of the control group frequencies were lower than those in the samples from the NPC patients. Here, PDLIM7 is linked to nasopharyngeal carcinoma.