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Kaplan–Meier plot showing statistically significant difference in recurrence-free interval (p < 0.001) for oropharyngeal squamous cell carcinoma (with or without oral cavity extension) treated with photodynamic therapy, compared to oral cavity tumors alone. Starting point in time is PDT illumination date until local recurrence. OC, oral cavity; OP ± OC extension, oropharyngeal squamous cell carcinoma with or without oral cavity extension.
