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Comparison of expression of cluster of differentiation 47 in different groups. *P<0.05, **P<0.01 and ***P<0.001 vs. NOM group; #P<0.05 and ##P<0.01 vs. LR-OLK group. NOM, normal oral mucosa; LR-OLK, oral leukoplakia with low-risk dysplasia; HR-OLK, oral leukoplakia with high-risk dysplasia; OSCC, oral squamous cell carcinoma.
