Abstract
Background: Previous studies have attempted to investigate the impact of smoking cessation on lung cancer survival but have been limited by small numbers of former smokers and incomplete data. Methods: Over a six-year period, 5229 patients with non-small-cell lung cancer (NSCLC) and small-cell lung cancer (SCLC) were enrolled in a prospective cohort of whom 2052 were former smokers. Patient's characteristics were obtained from medical records and a baseline interview. Vital status was determined through multiple sources. Cox proportional hazards models were used to estimate the effect of smoking abstinence on post-diagnosis mortality. Results: For all patients with NSCLC, the median survival among never, former, and current smokers was 1.4 years, 1.3 years, and 1.1 years, respectively (P < 0.01). Female NSCLC patients had a significantly lower risk of mortality with a longer duration of smoking abstinence (RR per 10 years of smoking abstinence = 0.85; 95% CI: 0.75, 0.97). No effect of smoking abstinence on mortality was observed for women with SCLC or for men with either histologic group. Conclusions: The identification of smoking history as a prognostic factor in lung cancer survival supports previous research suggesting a direct biologic effect of smoking on survival. However, this effect may vary by sex and type of lung cancer.
Original language | English (US) |
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Pages (from-to) | 165-172 |
Number of pages | 8 |
Journal | Lung Cancer |
Volume | 47 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2005 |
Keywords
- Carcinoma
- Lung neoplasms
- Non-small-cell lung
- Prognosis
- Sex
- Small-cell
- Smoking cessation
ASJC Scopus subject areas
- Oncology
- Pulmonary and Respiratory Medicine
- Cancer Research