CALR and nasopharyngeal carcinoma: Patients with NPC having a low expression of CALR had a significantly longer PFS and OS compared with the patients having high expression (61.023 ± 3.735 vs 33.758 ± 3.243, X2 = 14.901, P < 0.001; 77.111 ± 4.697 vs 39.785 ± 3.884, X2 =20.275, P < 0.001).