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Differential expression levels of salivary MMP-1 in OSCC and non-cancerous groups. (A) Clinical information and subgroups of OSCC (n = 269) in this study. (B) Associations between salivary MMP-1 content in HC, OPMD, and OSCC with different tumor sites. *** p < 0.001. The median level of salivary MMP-1 (pg/mL) in each subgroup is shown for comparison.
