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Survival analysis of patients with varying levels of CALR expression in NPC. Kaplan-Meier estimated progression-free survival (PFS) and overall survival (OS) for NPC patients according to the expression levels of CALR protein in 81 NPC patients. P values were obtained by using the log-rank test. N, The number of cases; Events, the number of cases, who had recurrent tumor or died during the follow-up period.
