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Introduction Second primary tumors   – ‘Synchronous’ : Detected or resected simultaneously  – ‘Metachronous’ : Detected some time after the primary lesion Incidence of synchronous lung cancers   – ranges from 0.2% to 8% (3.5%-14% in autopsy studies)  – Around 900,000 new multiple cancer cases globally (8% of 10,900,000)  – Age 50-64 : 5~12% / … 더 읽기