© 1991 Oxford University Press
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Cancer and Non-Cancer Controls in Studies on the Effect of Tobacco and Alcohol Consumption
,§
*Epidemiology Unit, Aviano Cancer Center Via Pedemontana Occ., 33081 Aviano (PN), Italy.
**Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center Denver, CO 80262, USA.
Epidemiology and Cancer Working Group, European Cancer Prevention Organization (ECP) Bruxelles, Belgium;
‘Mario Negri’ Institute for Pharmacological Research Via Eritrea 62, 20157 Milan. Italy.
§Institute of Social and Preventive Medicine, University of Lausanne 1005 Lausanne, Switzerland
A comparison of risk estimates using controls with other cancers versus controls with acute diseases unrelated to tobacco and alcohol consumption in the study of the effect of these two factors has been performed using data on tumours of the oral cavity and pharynx from an ongoing case-control surveillance programme in Northeastern Italy. Similar results were obtained using either type of controls: as compared to never smokers, moderate smokers (
14 cigarettes/day) showed age-and sex-adjusted odds ratio (OR)=5.2 (95% confidence interval (CI): 2.9–9.2) when using cancer controls and 5.8 (95% CI: 3.3–10.1) when using non-cancer controls. Similarly, those who had smoked for 40 years or longer showed ORs of 7.4(95% CI: 4.0–13.6) and 8.8 (95% CI: 4.9–15.6), respectively, using cancer and non-cancer controls: For moderate drinkers of alcoholic beverages (21–34 drinks/week) and heavy drinkers (
84 drinks/ week) the ORs, as compared to individuals who drank <21 drinks/week, were 1.9 (95%CI: 1.0–3.6) and 2.2 (95% CI: 1.2–4.0) and 10.6(95% CI: 5.5–20.6) and 11.4(95% CI: 6.0–21.4) using cancer and non-cancer controls, respectively. The same comparability of ORs for tobacco- and alcohol-related variables using either type of controls was observed when separate analyses of the two sexes were performed. The close similarity between cancer and non-cancer controls in studies on tabacco- and alcohol-related risks may be exploited when the choice of other types of controls would increase the costs and the feasibility of the study, and thus hamper its statistical power. Moreover, this investigation provides some reassurance about the validity of risk estimates using carefully selected groups of hospital controls.
Revised 1 February 1991
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