[Multiple primary malignant neoplasms and survival of patients with stage-I lung cancer].

The study group included 2161 patients operated on in 1968-1990. Tumors stage I were morphologically confirmed in 910 cases (T1S-3, T1-375 and T2-532). 827 patients survived 5 years (90.9%); 551 patients-10 years (60.3%). Primary multiple neoplasms (PMN) of different localization were detected in 96 (10.6%) patients with stage I tumors. Thirteen patients (13.5%) died of progression of a second tumor; 17 (17%)-of other causes. Average 5-year survival was 65%, 10 years-53%. These indices in 96 patients with PMNs were 73 and 53%, respectively. Relative risk of PMN in lung cancer was found to be in direct correlation with survival time and to depend, to a large degree, on tumor extension. When PMNs are detected early and treated radically, new primary tumors emergence does not significantly in lung cancer stage I. Preliminary results showed chemotherapy (neoadjuvant one included) to lower the risk of PMN in lung cancer stage I. The most plausible causes of enhanced survival of patients with PMNs are discussed.