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Cancer Risk Associated with Alcohol and Tobacco Use

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Cancer Risk Associated with Alcohol and Tobacco Use HEALTH RISKS CANCER RISK ASSOCIATED WITH ALCOHOL provided strong evidence of an association between alcohol AND TOBACCO USE: FOCUS ON UPPER AERO­ and tobacco use (both separately and in combination) and DIGESTIVE TRACT AND LIVER an increased risk of oral and pharyngeal tumors (Blot et al. 1988; Franceschi et al. 1990; Zheng et al. 1990, 2004). Claudio Pelucchi, Sc.D.; Silvano Gallus, Sc.D.; Werner Garavello, M.D.; Cristina Bosetti, Sc.D.; Risk Associated With Alcohol Consumption and Carlo La Vecchia, M.D. The risk of both oral and pharyngeal cancer rises steeply with the level of alcohol consumption. An analysis that Alcohol and tobacco, alone or in combination, are pooled data (i.e., a meta-analysis) from 26 studies of oral and associated with an increased risk of various cancers, pharyngeal cancers found that consumption of 25, 50, or including those of the upper aero-digestive tract and liver. 100 g pure alcohol/day1 was associated with a pooled relative Both alcohol and tobacco use can increase the risk of cancer risk (RR) of 1.75, 2.85, and 6.01, respectively, of oral and of the oral cavity and throat (pharynx), and their combined pharyngeal cancer (see Table 1) (Bagnardi et al. 2001). The use has a multiplicative effect on risk. Moreover, those RR indicates the strength of the relationship between a vari­ regions of the mouth and pharynx that are more directly able (e.g., alcohol consumption) and a given disease or type exposed to alcohol or tobacco are more likely to be affected of cancer. People without the exposure (e.g., nondrinkers) by cancer than other regions. A similar effect was found with are assigned a RR of 1.0. A RR greater than 1.0 indicates respect to cancer of the voice box (larynx). For squamous that the variable (e.g., drinking) increases the risk for that cell carcinoma of the esophagus, alcohol and tobacco also disease; furthermore, the greater the RR, the greater the asso­ appear to increase risk synergistically. With liver cancer, in ciation. Thus, the meta-analysis clearly demonstrated that contrast, alcohol consumption and tobacco use appear to be the RR for oral or pharyngeal cancer increased significantly independent risk factors. KEY WORDS: Alcohol and tobacco; with increasing amounts of alcohol consumed. Similarly, alcohol consumption; ethanol; smoking; tobacco use; another study conducted in Switzerland and Italy found that multiple drug use; cancer; risk factors; relative risk; nonsmokers who consumed five or more drinks per day had population-attributable risk; oral cancer; pharyngeal cancer; a five-fold increased risk of these cancers compared with laryngeal cancer; esophageal cancer; liver cancer; nondrinkers (Talamini et al. 1998). hepatocellular carcinoma The relationship between duration of alcohol consump­ tion and risk of oral or pharyngeal cancer is less consistent. Moreover, the effect of drinking cessation on the RR for oral oth alcohol and tobacco use are associated with or pharyngeal cancer is unclear. Thus, it appears that the RR numerous adverse health consequences, including an for these types of cancer appreciably declines only after 15 to Bincreased risk of certain types of cancer. For example, 20 years of abstinence (Hayes et al. 1999). epidemiological studies found that alcohol consumption can Several studies also evaluated the effects of different types increase the risk for cancers of the upper aero-digestive tract, of alcoholic beverages on cancer risk. These analyses found stomach, large bowel (i.e., colon and rectum), liver, and breast, with higher levels of consumption leading to greater 1In the United States, a standard drink is frequently defined as 0.5 ounces (oz) or 14 increases in risk (Bagnardi et al. 2001). Similarly, tobacco use grams of pure alcohol. This alcohol amount is contained in 12 fluid oz of beer, 5 fluid oz is associated with an elevated risk of lung cancer, as well as of of wine, or 1.5 fluid oz of 80-proof distilled spirits. Thus, the consumption levels analyzed cancers of the upper aero-digestive tract, bladder, kidney, here correspond to approximately two, four, and eight standard drinks per day, respectively. pancreas, stomach, and cervix and a certain type of leukemia (International Agency for Research on Cancer [IARC] 2004). CLAUDIO PELUCCHI, SC.D., is a researcher; SILVANO GALLUS, Many people use and abuse both alcohol and tobacco, SC.D., is a senior researcher; and CRISTINA BOSETTI, SC.D., is and their combined effects on cancer risk also have been head of the Unit of Cancer Epidemiology; all are at the Istituto widely investigated. This article summarizes those findings, di Ricerche Farmacologiche “Mario Negri” in Milan, Italy. focusing on cancers at sites that are most directly exposed during alcohol and tobacco consumption—that is, the upper WERNER GARAVELLO, M.D., is a researcher at the Istituto di aero-digestive tract (i.e., the oral cavity, throat [pharynx], Ricerche Farmacologiche “Mario Negri” in Milan, Italy, and a voice box [larynx], and esophagus) and the liver. researcher at the Clinica Otorinolaringoiatrica, Dipartimento di Neuroscienze e Tecnologie Biomediche, Università Milano- Bicocca in Monza, Italy. Oral and Pharyngeal Cancer CARLO LA VECCHIA, M.D., is head of the Laboratory of In developed countries, oral and pharyngeal cancers rarely General Epidemiology at the Istituto di Ricerche Farmacologiche occur in people who neither smoke nor drink alcohol. “Mario Negri” and an associate professor in epidemiology at the However, many epidemiological studies conducted over the Istituto di Statistica Medica e Biometria at the Università degli last three decades in the Americas, Europe, and Asia have Studi di Milano, both in Milan, Italy. Vol. 29, No. 3, 2006 193 HEALTH RISKS that cancer risk generally was increased regardless of the type ers than in ex-smokers and is higher in people who start of beverage consumed. Moreover, the magnitude of the asso­ smoking at an earlier age than in people who start smoking ciation between different types of beverages and cancer risk at a later age (IARC 2004). An Italian study found that the was inconsistent across studies and populations. In general, RRs for oral cancer were 5.3 for people who smoked less the beverage most frequently consumed in a population was than 15 cigarettes per day and 14.3 for people who smoked associated with the highest risk of oral and pharyngeal cancer 25 or more cigarettes per day, compared with people who in that population (Boffetta and Hashibe 2006). had never smoked (Franceschi et al. 1990). Furthermore, the Studies conducted in animals have demonstrated that alcohol itself (i.e., ethanol) does not cause tumor develop­ RRs were 5.9 for people who had smoked for less than 30 ment (i.e., is not carcinogenic). Instead, the primary break­ years and 18.0 for people who had smoked for 40 years or down product of ethanol in the body, acetaldehyde, has been more. Finally, the RR was higher (13.6) for people who had shown to cause damage to the organism’s genetic material, begun smoking before age 17. the DNA, thereby contributing to cancer risk (Boffetta and The risk of oral and pharyngeal cancer is increased in Hashibe 2006). Additional studies found that those anatomic smokers of all tobacco products, with a higher risk found sites that come into closest contact with the ingested alcohol— in smokers of cigarettes without filters than in smokers of that is, parts of the tongue and the region at the lower back of cigarettes with filters. In addition, some studies observed a the throat (i.e., the hypopharynx)—are at highest risk of being stronger association between smoking and cancer in smokers affected by cancer (see Figure). In contrast, no association was of pipes and cigars than in smokers of cigarettes (Zheng et found between alcohol consumption and an increased risk of al. 2004). Similarly, in the Italian study mentioned above, cancer in the upper portion of the throat (i.e., the nasopharynx) the RR for oral cancer was 11.1 for cigarette smokers and and the salivary glands that are embedded into the wall of the 20.7 for pipe or cigar smokers (Franceschi et al. 1990). oral cavity and throat (Boffetta and Hashibe 2006). Risk Associated With Smoking Risk Associated With Combined Alcohol Use and Smoking The risk of oral and pharyngeal cancer also is strongly related The effect of combined exposure to alcohol and tobacco on to smoking. For example, the study conducted in Italy and risk of oral and pharyngeal cancer appears to be multiplicative— Switzerland mentioned earlier also demonstrated that non­ that is, the risk of combined exposure is the product of the drinkers who smoked 25 or more cigarettes per day had a increases in risk associated with exposure to either habit. seven-fold increased risk of oral and pharyngeal cancer com­ Some studies found even greater (i.e., supra-multiplicative) pared with nonsmokers (Talamini et al. 1998). increases in risk associated with combined exposure to alco­ Other studies found that the risk of these types of cancer hol and tobacco. For example, Zheng and colleagues (2004) increases with amount and duration of smoking, with duration demonstrated that people who drank heavily and smoked of smoking having a greater impact on risk than amount. In had a 300-times higher risk of these cancers than people addition, the risk of these cancers is higher in current smok- who neither drank nor smoked. The rate of oral cancer is particularly high among both men and women in South Asia. In this region, tobacco smoking often is replaced by or combined with chewing of Nasopharynx tobacco and betel quid, which is another major risk factor for oral cancer (Parkin et al.
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