[Evaluation of the prognosis of patients with stage I non-small cell lung cancer with respect to predicted postoperative lung function].

One hundred and forty patients underwent absolute curative resction for stage I non-small lung cancer from 1982 to 1993 at our department. For these, prognosis and changes in quality of life (QOL) were evaluated retrospectively with respect to the predicted postoperative lung function. The average age of the patients was 62 years (range 31 to 84 years), and 103 males and 37 females were included. Seventy-five of the patients had adenocarcinoma, 61 squamous cell carcinoma, and 4 large cell carcinoma. These 140 patients were classified into two groups, H and N, according to the predicted postoperative %FEV1.0 and %VC. Group H patients (n = 39) had a predicted %FEV1.0 and/or %VC of 55% or less for postoperative respiratory disease. Group N patients (n = 101) had a predicted %FEV1.0 and %VC of 56% or more for expected normal respiratory conditions postoperatively. Group N patients showed a 98% one-year survival rate, and 72% five-year survival rate and good QOL postoperatively. On the other hand, group H patients showed 86% and 45% one- and five-year survival rates respectively, the same as those predicted for patients with stage II non-small cell lung cancer. Furthermore, group H patients more than 70 years old showed 80% and 17% one- and five-year survival rates, the same as those predicted for patients with stage IIIA non-small cell lung cancer, and poor prognosis in comparison with that of the group N patients more than 70 years old. Then, QOL was investigated one year postoperatively. The group H patients showed deterioration of performance status in comparison with the group N patients. Since there was a high incidence of postoperative respiratory disease in the patients with a predicted %FEV1.0 and/or %VC of 55% or less, physicians should avoid extended lung resection, which might cause deterioration of the cardiopulmonary reserve volume, in patients in whom respiratory disease is predicted to occur, particularly for patients more than 70 years old. In conclusion, physicians should consider limiting surgical intervention to preserve lung volume and QOL of patients more than 70 years old with restricted cardiopulmonary function.