JAK2 and nasopharyngeal carcinoma: The Kaplan–Meier survival curve results demonstrated that the survival time of NPC patients with negative expression of JAK2 was 58.7 ± 5.3 months, while the survival time of patients with positive JAK2 expression was 33.6 ± 19.7 months, which indicated that the survival time of the NPC patients with negative expression of JAK2 was significantly longer than that of NPC patients with positive JAK2 expressions (P < 0.05, Fig. 2a).