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J Thorac Cardiovasc Surg 2000;119:21-026
© 2000 Mosby, Inc.
GENERAL THORACIC SURGERY |
From the Thoracic Surgery Unita and the Division of Anesthesiology,b University Hospital of Geneva, and the Geneva Cancer Registry,c Geneva, Switzerland.
Address for reprints: Anastase Spiliopoulos, MD, Thoracic Surgery Unit, Department of Surgery, University Hospital of Geneva, rue Micheli-du-Crest 24, 1211 Geneva 14, Switzerland.
Objective And Methods: To characterize gender differences in lung cancer, we conducted a retrospective analysis including all patients undergoing surgery for nonsmall cell lung carcinoma in a single institution over a 20-year period.
Results: Compared with men (n = 839), women (n = 198) were more likely to be asymptomatic (32% vs 20%, P = .006), nonsmokers (27% vs 2%, P < .001), or light smokers (31 pack-years vs 52 pack-years; P < .001). Squamous cell carcinoma predominated in men (65%), and adenocarcinoma predominated in women (54%). Preoperative bronchoscopy contributed more frequently to a histologic diagnosis in men (69% vs 49% in women, P < .001), and fewer pneumonectomies were performed in women (22% vs 32% in men, P = .01). After multivariate Cox regression analysis, women survived longer than men (hazard ratio, 0.72; 95% confidence interval, 0.56-0.92; P = .009) independently of age, presence of symptoms, smoking habits, type of operation, histologic characteristics, and stage of disease. The protective effect linked to female sex was present in early-stage carcinoma (stage I and II) and absent in more advanced-stage carcinoma (stage III and IV).
Conclusions: This study emphasizes strong sex differences in presentation, management, and prognosis of patients with nonsmall cell lung cancer.
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