Gender differences in lung cancer risk by smoking: a multicentre case-control study in Germany and Italy

Several studies in the past have shown appreciably higher lung cancer risk estimates associated with smoking exposure among men than among women, whil e more recent studies in the USA report just the opposite. To evaluate this topic in a European population we conducted a case-control study of lung c ancer in three German and three Italian centres. Personal interviews and st andardized questionnaires were used to obtain detailed life-long smoking an d occupational histories from 3723 male and 900 female cases and 4075 male and 1094 female controls. Lung cancer risk comparing ever-smokers with neve r-smokers was higher among men (odds ratios (OR) adjusted for age and centr e = 16.1, 95% confidence interval (CI) 12.8-20.3) than among women (OR = 4. 2, CI 3.5-5.1). Because the smoking habits of women were different from men , we conducted more detailed analyses using comparable levels of smoking ex posure. After restriction to smokers and adjustment for other smoking varia bles, risk estimates did not differ appreciably between genders. The analys is of duration of smoking (0-19, 20-39, 40+ years) adjusted for cigarette c onsumption and time since quitting smoking revealed similar risk estimates in men (OR = 1.0, 3.3 [CI 2.6-4.2], 4.1 [CI 3.1-5.6]) and women (OR = 1.0, 2.7 [CI 1.7-4.1], 3.3 [CI 1.9-5.8]). The same was true of the analysis of a verage or cumulative smoking consumption, and also of analyses stratified b y different histological types. We conclude that for comparable exposure to tobacco smoke, the risk of lung cancer is comparable in women and men. (C) 2000 Cancer Research Campaign.