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We report the incidence, risk factor(s), and overall survival (OS) of second/multiple primary tumors (SPTs/MPTs) in oral cavity squamous cell carcinoma (OSCC) patients in betel quid chewing areas. Of 816 untreated OSCC patients who had radical surgery, 15.7% had either synchronous or metachronous SPTs. The SPTs (70.3%) were at the oral cavity. SPTs (18.8%) developed third primary tumors, with a significantly...
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