Fig. 1: A low NDRG2 expression level is associated with distant metastasis and poorer survival.

a The relative mRNA expression of NDRG2 in 21 pairs of fresh primary tumor samples and the corresponding normal salivary gland tissues. b Representative images of the IHC staining of NDRG2 in paraffin-embedded tissues of tumors and the adjacent normal salivary glands (* tumors, █ normal salivary glands). The Kaplan–Meier analysis was used to compare the overall survival (c), distant metastasis-free survival (d) and recurrence-free survival (e) between the NDRG2-high and NDRG2-negative/low groups of 127 SACC patients