INCREASED RISK FOR SMALL-CELL LUNG-CANCER FOLLOWING RESIDENTIAL EXPOSURE TO LOW-DOSE RADON - A PILOT-STUDY

Alpha track radon detectors were placed in the homes of 35 lung cancer patients and 35 matched controls for a period of 8 to 10 mo. Twenty l ung cancer patients had small cell lung carcinoma; 11 had adenocarcino ma, 2 had squamous cell carcinoma, and 2 had unclassified carcinoma am ong 15 nonsmokers. Mean overall living on ground level was significant ly higher in the group with small cell lung carcinoma (50 y +/- 15) th an among controls (33 y +/- 19); the adjusted odds ratio for lung canc er was 5.2 (90% confidence interval [90% CI] = 1.1-24.9) per decade of living on the ground floor for the group with small cell lung carcino ma. Radon exposure of more than 1.0 pci/l in the group with small call lung carcinoma was associated with increased risk of lung cancer, alt hough it did not reach statistical significance [odds ratio = 1.5 (90% CI = 0.4-5.4)], adjusting for differences in smoking habits. Our stud y supports the presence of a differentially increased risk for small c ell lung carcinoma following long-term radon exposure.