The late results of surgical treatment of non small cell lung cancer in 735 patients treated in the years 1981-1986 are presented. 59.3% of the patients with stage I disease are alive after 5 years; 43% with stage II and 23.6% with stage III. 326 (44.3%) out the initial number of 735 surgically treated patients have survived 5 years. 274 patient died in the course of local recurrencies and distal metastases, while 135 died due to nonmalignant causes.