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OGR1 promoter CpG site methylation remains at a stable level across different groups of HNSC patients. A–E, The OGR1 promoter CpG sites methylation was maintained at a relatively stable level across different degrees of malignancy, race, sex, and age (the n is the same as that in each group in Figure 2) (*P < .05). F, OGR1 expression was negatively correlated with promoter CpG site methylation
