There was a significant reverse correlation between Cks1 and p27<sup>kip1</sup> protein expression in NPC (r = -0.189, P < 0.05).In addition, Kaplan-Meier survival curve showed that there was a significant tendency of shorter overall survival (OS) in NPC patients with Cks1 positive expression compared to negative ones, especially in patients with lymph node metastasis (P < 0.001, respectively).