Actos Warning News Flash
Actos Warning : Recently, a metaanalysis of observational studies on cigarette smoking and cancer from 1961 to 2003 has been published. The authors extracted data from 254 reports published during that period of time and included them in the 2004 IARC Monograph on Tobacco Smoke and Involuntary Smoking. The analyses were arried out on 216 studies with reported estimates for current and/or former smokers. The pooled risk estimates for BC demonstrated significant association for both current and former smokers. In an analysis of 21 studies, the overall relative risk calculated for current smokers was 2.77 [95% confidence interval (CI) 2.17, 3.54]; while from the analyses of 15 studies, the overall relative risk calculated for former smokers was 1.72 (95% CI 1.46, 2.04) (Gandini et al. 2008).
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In a pooled analysis of 11 case-control studies regarding cigarette smoking and BC, the following three variables were analyzed: duration of smoking, average number of cigarettes smoked per day, and time since quitting smoking. The population consisted of 2600 cases and 5524 controls. An increasing risk of BC was observed with increasing duration of smoking, which appeared to be linear. The relative increase was approximately 100% after 20 years smoking and reaches to 400% after 50 years smoking. In addition, a relationship was observed between the number of cigarettes smoked per day and BC.
The OR increased to nearly threefold for those who smoked between 15 and 20 cigarettes per day, after which a plateau in the risk graph was observed. They concluded that the duration of smoking habit and not the amount of cigarettes smoked per day was the main determining factor for BC. An immediate decrease in risk of BC was observed for those who quit smoking. This reduction was about 40% within 1-4 years of quitting smoking and reaches 60% after 25 years of cessation. However, the risk does not reach the level of nonsmokers even after 25 years. This suggests that tobacco has a late effect in the carcinogenesis of BC, but the fact that this risk does not reach the levels of nonsmokers until 25 years after quitting smoking suggests that tobacco may also be involved in an early irreversible stage in the carcinogenesis process (Brennan et al. 2000).
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Other issues as type of tobacco could be taken into account. Six studies have published a significant higher risk of BC for the blacks who are cigarette smokers compared to smokers of otherraces. Also, case-control studies suggest a strong evidence of a carcinogenic effect of cigars and pipe, which is comparable to that of cigarettes (Boffetta 2008). The mode of inhalation of tobacco smoke has been related to BC risk, as well. In a case-control study of smoking and BC from Spain that included 1219 cases and 1271 controls, they concluded that the former and current smokers experienced risks of BC three to seven times higher than nonsmokers, respectively.
In addition, they found that the risk was higher for subjects who inhaled into the throat or chest [OR 4.8 (95% CI 2.3-9.9)] compared with those who inhaled only into the mouth [OR 10.0 (95% CI 6.7-15.0)], at each level of duration (Samanic et al. 2006).
Taking into account that current smokers have higher risk of BC than nonsmokers, and that this risk decreases by 40% after 1-4 years of quitting smoking, the promotion of cessation of smoking would allow reducing the incidence of BC in men and women.
Internationally, there is a general agreement on the broad strategy needed to successfully combat the tobacco epidemic.
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