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Comprehensive analysis of positive index between ghrelin and GHSR group (t test) (A); comparison of positive indices of ghrelin and GHSR in different pathologic stages (one-way ANOVA) (B). In the Figures, 1–5 indicated normal, mild dysplasia, moderate dysplasia, severe dysplasia, and OSCC, respectively. * indicated P < 0.05, ** indicated P < 0.01
