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Kaplan–Meier survival curves for patients with OPC based on GPCR gene methylation status. Disease-free survival based on (A) methylation status in full cases (n = 85), (B) HPV status in full cases (n = 85), (C) methylation status in HPV-associated OPC cases (n = 48), (D) methylation status in HPV-negative OPC cases (n = 37). *p < 0.05.
