BACKGROUND & OBJECTIVE: Along with the progress of tumor diagnosis, the detection of multiple primary tumors (MPT) of the lung combined with other organs is increasing, but their clinical features and prognosis are unclear yet. This study was to investigate clinical features and prognosis of MPT of the lung combined with other organs. METHODS: Of the 281 patients with MPT of the lung combined with other organs, treated in our hospital from Jan. 1990 to Dec. 2000, 115 had lung cancer diagnosed first (Group A...