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Kaplan–Meier plots of the incidence of second, third, and fourth primary tumors in OSCC patients (A), and 5-year incidence of fourth primary tumors in OSCC patients stratified according to the presence of simultaneous first and second primary tumors (B), betel quid chewing (C), buccal subsite (D), and pT status (E). OSCC = oral cavity squamous cell carcinoma.
