[Risk factors for tumors of the bladder. Epidemiological study of 701 patients in Ile-de-France].

: The authors present the results of an investigation conducted, under the aegis of the PETRI association, on 701 patients living in the Paris region who, over a 1-year period, had asked the medical advisers of the Social Security Sickness Benefits department to dispense them from paying their portion of the cost of treatment on the ground that they had cancer of the bladder*. The purposes of the investigation were to obtain accurate data concerning the role played by tobacco and alcohol abuse in bladder cancer and to look for possible occupational exposures. The smoking and drinking habits of 636 patients could be analyzed: 89 percent of the men were, or had been, smokers with an average consumption of 33 packs per annum, and with a frequent overconsumption of alcoholic drinks. The professional cursus of 665 patients (31 percent active, 64 percent retired) could be established. The study confirmed that tobacco smoking and alcohol abuse, as well as certain occupational factors, play a role in the development of bladder cancer. Some professional sectors, such as the plastic industry or the hide and leather work, were better represented among these patients than would have been expected from their distribution in the active population. Surveillance of the population exposed by industrial doctors, and follow-up of people who have retired from some sectors of activity are as essential as anti-smoking campaigns.