Variations in apolipoprotein E frequency with age in a pooled analysis of a large group of older people

Variation in the apolipoprotein E gene (APOE) has been reported to be associated with longevity in humans. The authors assessed the allelic distribution of APOE isoforms ε2, ε3, and ε4 among 10,623 participants from 15 case-control and cohort studies of age-related macular degeneration (AMD) in populations of European ancestry (study dates ranged from 1990 to 2009). The authors included only the 10,623 control subjects from these studies who were classified as having no evidence of AMD, since variation within the APOE gene has previously been associated with AMD. In an analysis stratified by study center, gender, and smoking status, there was a decreasing frequency of the APOE ε4 isoform with increasing age (χ(2) for trend = 14.9 (1 df); P = 0.0001), with a concomitant increase in the ε3 isoform (χ(2) for trend = 11.3 (1 df); P = 0.001). The association with age was strongest in ε4 homozygotes; the frequency of ε4 homozygosity decreased from 2.7% for participants aged 60 years or less to 0.8% for those over age 85 years, while the proportion of participants with the ε3/ε4 genotype decreased from 26.8% to 17.5% across the same age range. Gender had no significant effect on the isoform frequencies. This study provides strong support for an association of the APOE gene with human longevity.     

A community-based study of cigarette smoking behavior in relation to variation in three genes involved in dopamine metabolism: Catechol-O-methyltransferase (COMT), dopamine beta-hydroxylase (DBH) and monoamine oxidase-A (MAO-A)

OBJECTIVE: Cigarette smoking behavior may be influenced by catechol-O-methlyltransferase (COMT), dopamine beta-hydroxylase (DBH), and monamine oxidase-A (MAO-A), genes that play roles in dopamine metabolism. The association between common polymorphisms of these genes and smoking behavior was assessed among 10,059 Caucasian volunteers in Washington County, MD in 1989. METHODS: Age-adjusted logistic regression was used to measure the association between variants of these single nucleotide polymorphisms and smoking initiation and persistent smoking. RESULTS: Overall, no association was seen between each genotype and smoking behavior. However, among younger (<54 years) women, the COMT GG genotype was positively associated with smoking initiation (OR=1.3; 95% CI: 1.0 1.5), and the MAO-A TT genotype was inversely associated with persistent smoking (OR=0.7; 95% CI: 0.4, 1.0). Men who smoked fewer than 10 cigarettes per day were more likely to be persistent smokers if they had the COMT GG (OR=1.7; 95% CI: 1.0, 2.9) or the DBH GG (OR=1.6; 95% CI: 1.0, 2.5) genotypes. CONCLUSION: Overall the results of this large community-based study do not provide evidence to support the presence of important associations between variants of COMT, DBH, or MAO-A and smoking initiation or persistent smoking.     

Glutathione S-transferase M1 (GSTM1) and glutathione S-transferase T1 (GSTT1) null polymorphisms, smoking, and their interaction in oral cancer: a HuGE review and meta-analysis

The association between glutathione S-transferase M1 (GSTM1) and glutathione S-transferase T1 (GSTT1) null polymorphisms and oral cancer is not consistent across studies, and data on their interaction with smoking in oral cancer are lacking. The authors systematically searched PubMed and SciVerse Scopus for case-control studies examining the association between null genotypes of the GSTM1 and GSTT1 genes and oral cancer. Twenty-eight case-control studies published in English were identified. Summary odds ratios were derived via random-effects models. The summary odds ratio for the GSTM1 null genotype was 1.43 in Asians (95% confidence interval (CI): 1.14, 1.78; P < 0.01, I (2) = 73%) and 0.98 in Caucasians (95% CI: 0.76, 1.28; P = 0.91, I (2) = 0%). Case-only analysis of 6 studies (552 cases) showed an inverse multiplicative interaction between GSTM1 null polymorphisms and smoking (ever/high levels of smoking vs. never/low levels) (odds ratio (OR) = 0.51, 95% CI: 0.32, 0.82; P = 0.01, I (2) = 34%). The GSTT1 null genotype was not significantly associated with oral cancer in Asians (OR = 1.07, 95% CI: 0.82, 1.38; P = 0.63, I (2) = 65%) or Caucasians (OR = 1.04, 95% CI: 0.41, 2.65; P = 0.93, I (2) = 55%). In conclusion, the GSTM1 null genotype may be associated with a higher risk of oral cancer in Asians but not in Caucasians, and this effect may be modified by smoking status. The GSTT1 null genotype may not be associated with oral cancer.     

Body mass decrease after initial gain following smoking cessation

BACKGROUND: Although smoking cessation is strongly associated with subsequent weight gain, it is not clear whether the initial gain in weight after smoking cessation remains over time. METHOD: Cross-sectional analyses were made, using data from periodic health examinations for workers, on the relationship between body mass index (BMI) and the length of smoking cessation. In addition, linear regression coefficients of BMI on the length of cessation were estimated according to alcohol intake and sport activity, to examine the modifying effect of these factors on the weight of former smokers. RESULTS: Means of BMI were 23.1 kg/m2, 23.3 kg/m2, 23.6 kg/m2 for light/medium smokers, heavy smokers and never smokers, respectively. Among former smokers who had smoked > or = 25 cigarettes a day, odds ratio (OR) of BMI >25 kg/m2 were 1.88 (95% confidence interval [CI] : 1.05-3.35), 1.32 (95% CI : 0.74-2.34), 0.66 (95% CI: 0.33-1.31) for those with 2-4 years, 5-7 years, and 8-10 years of smoking cessation, respectively. The corresponding OR among those who previously consumed <25 cigarettes a day were 1.06 (95% CI: 0.58-1.94), 1.00 (95% CI: 0.58-1.71), and 1.49 (95% CI: 0.95-2.32). CONCLUSIONS: The results suggest that although heavy smokers may experience large weight gain and weigh more than never smokers in the few years after smoking cessation, they thereafter lose weight to the never smoker level, while light and moderate smokers gain weight up to the never smoker level without any excess after smoking cessation.     

Correlates of smoking in pregnant women in six Brazilian cities

OBJECTIVE: To evaluate sociodemographic and lifestyle correlates of smoking in pregnant women sampled from hospitals. METHODS: A cross-sectional study was conducted in 5,539 pregnant women aged 20 or more who sought medical attention in prenatal clinics of affiliate hospitals of the Brazilian National Health System in the cities of Manaus, Fortaleza, Salvador, Rio de Janeiro, S?o Paulo, and Porto Alegre from 1991 to 1995. Interviews were conducted using a standardized questionnaire that covered sociodemographics and smoking habits before and during pregnancy. Current smoking was defined as smoking at least one cigarette/day, former smoking as reporting having smoked at least one cigarette/day but having quit, and never smoking as never having smoked one cigarette/day. RESULTS: Smoking during pregnancy was associated with lower education (OR=2.13; CI 95%: 1.76-2.57) and greater parity (OR=1.84; CI 95%: 1.53-2.21). Positive associations were also found with increased gestational age and alcohol consumption. No significant association was found with skin color or occupation status. A protective effect was observed for women married or living with a partner (OR=0.55 CI 95%: 0.42-0.72). Having Manaus' women as a reference, Porto Alegre's women showed the greatest risk for smoking in pregnancy (OR=5.00; CI 95%: 3.35-7.38), followed by S?o Paulo's (OR=3.42; CI 95%: 2.25-5.20), Rio de Janeiro (OR=2.53; CI 95%: 1.65-3.88) and Fortaleza's (OR=2.56; CI 95%: 1.74-3.78). CONCLUSIONS: The study findings are similar to those described in the literature regarding education, parity, and marital status. However, no association with skin color was seen in the multivariate analysis. Former smokers had sociodemographic characteristics more similar to non-smokers than former smokers.     

CYP1A1 gene polymorphisms in modifying the association between passive smoking and primary dysmenorrhea

PURPOSE: This study investigated whether the association between passive smoking exposure and primary dysmenorrhea is modified by two susceptibility genes, cytochrome P450 1A1 (CYP1A1)MspI and CYP1A1HincII. METHODS: We recruited 1645 female textile workers from 1997 to 2000 in Anqing, China, collecting information about passive smoking and status of primary dysmenorrhea and taking blood samples. We analyzed the association of CYP1A1 gene polymorphisms and passive smoking exposure with primary dysmenorrhea using multiple logistic regression. RESULTS: In the passive smoking group, women who had the C/C6235 genotype (odds ratio [OR] = 1.8; 95% confidence intervals [CI] = 1.0-3.3) in CYP1A1MspI and Ile/Ile462 genotype (OR = 2.9; 95% CI = 1.1-7.7) in CYP1A1HincII had increased risk of dysmenorrhea. When stratified by genotype, the adjusted OR of dysmenorrhea was 1.6 (95% CI = 1.2-2.1) for the passive smoking group with the Ile/Ile462 genotype and 1.5 (95% CI = 1.0-2.1) with the C/C6235 genotype, compared with the nonpassive smoking group. The data further showed that there was a significant combined effect between passive smoking and the CYP1A1MspI C/C6235 and HincII Ile/Ile462 genotypes (OR = 2.4; 95% CI = 1.2-4.9). CONCLUSIONS: CYP1A1MspI and HincII genotypes modified the association between passive smoking and primary dysmenorrhea.     

甘肃省15～69岁现在吸烟者戒烟意愿及影响因素

  目的  了解甘肃省现在吸烟者的戒烟意愿以及影响因素,为烟草防控工作提供科学依据。  方法  采用多阶段抽样方法,随机抽取15~69岁现在吸烟者作为调查对象。采用《全国居民吸烟情况调查问卷》开展面对面调查,分析不同特征现在吸烟者的戒烟意愿,采用Logistic回归分析模型分析现在吸烟者戒烟意愿的影响因素。  结果  甘肃省现在吸烟者的戒烟意愿为16.4%（95%CI:15.5%~17.3%）,农村地区（OR=1.199,95%CI:1.022~1.408,P=0.026）、家中禁止吸烟（OR=1.767,95%CI:1.273~2.454,P=0.001）、12个月内就医时医务人员劝阻吸烟（OR=1.599,95%CI:1.359~1.842,P < 0.001）、去过戒烟门诊（OR=3.089,95%CI:2.031~4.698,P < 0.001）、初中、高中、大专及以上文化程度（OR=1.383,95%CI:1.101~1.736;OR=1.627,95%CI:1.252~2.116;OR=1.374,95%CI:1.009~1.873,均有P < 0.05）、高烟草危害知识得分为1~,3~,5~6（OR=1.248,95%CI:1.030~1.514;OR=1.574,95%CI:1.289~1.922;OR=2.288,95%CI:1.879~2.786,均有P < 0.05）是现在吸烟者戒烟意愿的促进因素;年龄20~、30~岁组以及烟龄20~、30~年是现在吸烟者戒烟意愿的阻碍因素。  结论  甘肃省现在吸烟者戒烟意愿总体不高,今后应进一步在全社会普及烟草危害知识,加强医务人员戒烟服务能力培训,在诊疗过程中开展戒烟服务,同时应鼓励和支持医疗机构加快戒烟门诊建设。     

Passive smoking, cytochrome P450 gene polymorphisms and dysmenorrhea

PURPOSE: This study investigated whether the association between passive smoking exposure and dysmenorrhea is modified by two susceptibility genes, CYP1A1MspI and CYP1A1HincII. METHODS: This report includes 1,645 (1,124 no dysmenorrhea, 521 dysmenorrhea) non-smoking and non-drinking newly wedding female workers at Anqing, China between June 1997 and June 2000. Multiple logistic regression models were used to estimate the associations of passive smoking exposure and genetic susceptibility with dysmenorrhea, adjusting for maternal age, BMI, age of menarche, education, vibration exposure, shift work, noise exposure, pregnancy history, perceived stress and physical laboring stress. RESULTS: In the passive smoking group, women who have C/C6235 genotype (OR = 1.8, 95% CI = 1.0-3.3) in CYP1A1MspI and Ile/Ile462 genotype (OR = 2.9, 95% CI = 1.1-7.7) in CYP1A1HincII was associated with an increased risk of dysmenorrhea. When stratified by women genotype, the adjusted OR of dysmenorrheal was 1.6 (95% CI = 1.2-2.1) for passive smoking group with Ile/Ile462 genotype, and 1.5 (95% CI = 1.0-2.1) with C/C6235 genotype, compared to non-passive smoking group, respectively. The data further showed that there was a significant combined effect between passive smoking and the CYP1A1 Msp1C/C6235 (OR = 1.5, 95% CI = 1.0-2.1), and HincII Ile/Ile462 (OR = 1.6, 95% CI = 1.2-2.1), respectively. CONCLUSION: CYP1A1 MspI and HincII genotypes modified the association between passive smoking and dysmenorrhea.     

Prospective study of lutein/zeaxanthin intake and risk of age-related macular degeneration

BACKGROUND: The association between lutein/zeaxanthin intake and age-related macular degeneration (AMD) risk may differ by smoking status, vitamin C and E intakes, and body fatness. OBJECTIVE: The objective was to evaluate the association between lutein/zeaxanthin intake and AMD risk by smoking status, intake of antioxidant vitamins, and body fatness. DESIGN: We conducted a prospective follow-up study of 71 494 women and 41 564 men aged >or=50 y and had no diagnosis of AMD or cancer. Diet was assessed with a validated semiquantitative food-frequency questionnaire. RESULTS: During up to 18 y of follow-up, we documented 673 incident cases of early AMD and 442 incident cases of neovascular AMD with a visual loss of 20/30 or worse due primarily to AMD. Lutein/zeaxanthin intake was not associated with the risk of self-reported early AMD. There was a statistically nonsignificant and nonlinear inverse association between lutein/zeaxanthin intake and neovascular AMD risk; the pooled multivariate relative risks for increasing quintiles of intake were 1.00 (referent), 0.80, 0.84, 0.97, and 0.72 (95% CI: 0.53, 0.99) (P for trend = 0.14). For early AMD, the association with lutein/zeaxanthin intake did not vary by smoking status, intakes of vitamins C and E, or body mass index. For neovascular AMD, a nonlinear inverse association was found among never smokers. CONCLUSIONS: These data do not support a protective role of lutein/zeaxanthin intake on risk of self-reported early AMD. The suggestion of inverse associations related to the risk of neovascular AMD needs to be examined further.     

亚甲基四氢叶酸还原酶基因C677T多态性与胃癌易感性的关系

目的 研究亚甲基四氢叶酸还原酶（MTHFR）基因C677T多态性及其和烟酒嗜好相互作用与胃癌中易感性的关系。方法 在上消化道癌高发区江苏省淮安市进行病例对照研究（胃癌患者107例，对照人群200名）。调查研究对象的生活习惯，采用PCR－RFLP技术检测研究对象的MTHFR基因型。结果 （1）胃癌组中MTHFR变异基因型拥有者的比例79．4％，显著高于对照组的68．5％（x^2=4.15,P=0.0416)。MTHFR变异基因型拥有者发生胃癌的危险性显著升高（OR＝1.78,95%,CI:0.99-3.22；性别和年龄调整OR＝1．89，95％CI：1．08－3．32）。（3）在MTHFR变异基因型拥有者中，伴有吸烟习惯者发生胃癌的OR为7．72％（95％CI：2．23－26．79），伴有经常饮酒习惯者发生胃癌的OR为3．08％（9T％CI：1．30－7．23）。与不吸烟，不经常饮酒的野生型纯合子MTHFR基因型拥有者相比，伴有吸烟的经常饮酒习惯的MTHFR变异基因型拥有者发生胃癌的OR为13．96％（95％CI：2．76－70．46）。结论 MTHFR C677T变异基因型与胃癌的易感性有关；吸烟和饮酒与MTHFR变异基因型在胃癌发生中有明显的协同作用。     

Apolipoprotein E e4 allele affects risk of hyperhomocysteinemia in the elderly

BACKGROUND: Apolipoprotein E (APOE) plays a central role in VLDL metabolism. Both APOE e4 allele (APOE4) and C-reactive protein (CRP) are associated with greater risk of dementia and vascular disease, but APOE4 carriers have lower blood concentrations of CRP than do noncarriers, possibly through a mechanism favoring the clearance of the CRP VLDL-bound fraction. Homocysteine, another risk factor for vascular disease and dementia, also binds to VLDL in blood. However, the association between APOE4 and hyperhomocysteinemia has never been thoroughly investigated. OBJECTIVE: We investigated in an elderly population whether 1) APOE4 is associated with hyperhomocysteinemia [plasma total homocysteine (tHcy) > 15 micromol/L], 2) hyperhomocysteinemia affects the association between APOE4 and high CRP (serum CRP > 3 mg/L), and 3) B vitamin status affects these associations. DESIGN: APOE4 genotypes were assessed and tHcy, CRP, and serum concentrations of folate and vitamin B-12 were measured in 671 cognitively healthy subjects (52% women; mean age: 73 y) from an Italian population-based prospective cohort study. RESULTS: APOE4 carriers without high CRP [multivariate-adjusted odds ratio (OR): 0.22; 95% CI: 0.08, 0.59] had a lower risk of hyperhomocysteinemia than did noncarriers. The risk of high CRP was lower in APOE4 carriers without hyperhomocysteinemia (multivariate-adjusted OR: 0.51; 95% CI: 0.31, 0.85) than in noncarriers. The associations were not affected by B vitamin status. CONCLUSION: Independently from B vitamin status, APOE4 carriers have a lower risk of hyperhomocysteinemia and of high CRP than do noncarriers, but the presence of one condition attenuates the association of APOE4 with the other condition.     

Adolescent receptivity to tobacco marketing by racial/ethnic groups in California

BACKGROUND: Previous research has examined tobacco marketing receptivity across racial/ethnic groups but none has done so across the various levels of the smoking uptake continuum. Identifying adolescent groups that may be more or less receptive to industry marketing, particularly across the levels of smoking uptake, provides important information that may be useful in focusing efforts to eliminate smoking disparities. METHODS: Data came from 5857 adolescents (66.6% response rate) from the 2002 California Tobacco Survey and were analyzed in 2006. An index measure of receptivity to tobacco marketing was based on advertisement recall and willingness to use/own a tobacco promotional item. Respondents were classified along a smoking uptake continuum as committed never smokers, susceptible never smokers, or any smoking. Logistic regression models controlling for possible confounding variables were fit to test for the association between receptivity and race/ethnicity across levels of smoking uptake. RESULTS: African Americans (odds ratio [OR]=0.77; 95% confidence interval [CI]=0.61-0.96) and Asian/Pacific Islanders (OR=0.80; 95% CI=0.66-0.97) were less likely than non-Hispanic white adolescents to be receptive to tobacco marketing after controlling for possible confounders. For susceptible never smokers, African Americans (OR =0.67; 95% CI=0.47-0.93) and Asian/Pacific Islanders (OR=0.72; 95% CI=0.54-0.95) were less likely than non-Hispanic white adolescents to be receptive. CONCLUSIONS: There may be features of the African-American and Asian/Pacific Islander cultures that are protective against receptivity to tobacco marketing, even among those who are susceptible never smokers. Prevention strategies emphasizing such features for adolescents of other races/ethnicities may be beneficial in reducing smoking disparities.     

Nondaily smokers should be asked and advised to quit

BACKGROUND: Nondaily smokers are a growing subpopulation of smokers. Current cessation guidelines were developed for daily smokers, and how clinicians might help nondaily smokers is not clear. METHODS: Analyzing the 2000 National Health Interview Survey in 2004, we compared characteristics of nondaily smokers with never smokers and daily smokers. We used multivariate logistic regression to compare predictors of wanting to quit in 6 months between nondaily and daily smokers. RESULTS: About one in five current smokers was a nondaily smoker. Nondaily smokers reported better health than daily smokers, but had some health status indicators suggesting worse health than never smokers. Nondaily smokers were more likely to want to quit (odds ratio [OR]=1.31, 95% confidence interval [CI]=1.10-1.56) than daily smokers, but were less likely to report a physician having asked about tobacco use (41% vs 50%, p<0.0001) or advised quitting (31% vs 41%, p<0.0001). In both nondaily and daily smokers, physician advice (nondaily OR=1.50, 95% CI=1.03-2.2; daily OR=1.58, 95% CI=1.32-1.89), and the belief that secondhand smoke harms others (nondaily OR=1.48, 95% CI=1.04-2.1; daily OR=1.80, 95% CI=1.56-2.1), predicted wanting to quit. Higher-educated nondaily smokers were less likely to want to quit (OR=0.54, 95% CI=0.32-0.91), unlike in daily smokers (OR=1.48, 95% CI=1.15-1.89). Latino nondaily smokers were less likely (OR=0.43, 95% CI=0.30-0.64) than whites, and African-American daily smokers were more likely (OR=1.27, 95% CI=1.04-1.55) than whites, to want to quit. CONCLUSIONS: While daily smokers may seem a higher cessation priority, nondaily smokers may be more likely to quit with brief interventions. Cessation messages should address health risks of any smoking, ethnic differences, smoke-free messages, and situational triggers.     

Association between asbestos exposure,cigarette smoking,myeloperoxidase (MPO) genotypes,and lung cancer risk

BACKGROUND: As observed in tobacco-associated carcinogenesis, genetic factors such as the polymorphic metabolic/oxidative enzyme myeloperoxidase (MPO) could modulate individual susceptibility to asbestos-associated carcinogenesis. METHODS: RFLP-PCR analysis identified the MPO genotypes in 375 Caucasian lung cancer cases and 378 matched controls. An epidemiological interview elicited detailed information regarding smoking history and occupational history and exposures. RESULTS: Asbestos exposure was associated with a significantly elevated risk estimate (OR = 1.45; 95% CI 1.04-2.02). On stratified analysis, we found the MPO genotypes modified the effect of asbestos exposure on lung cancer risk. Specifically, G/G carriers who were exposed to asbestos had an odds ratio (OR) of 1.72 (95% CI; 1.09-2.66), while A-allele carriers (G/A + A/A) exposed to asbestos exhibited a reduced OR of 0.89 (95% CI; 0.56-1.44). The OR was further reduced to 0.73 (0.49-1.06) for A-allele carriers not exposed to asbestos. A similar trend was observed for the joint effects between the MPO genotypes and pack-years smoking. Next, all three risk factors (MPO genotypes, asbestos exposure, and smoking) were analyzed simultaneously for joint effects. Heavy smokers with the G/G genotype and a history of asbestos exposure demonstrated a statistically significant elevated risk estimate (OR = 2.19; 95% CI 1.16-4.11), while the A-allele carriers with the same exposure profile were at a lower risk for lung cancer (OR = 1.18; 95% CI 0.58-2.38). The A-allele genotypes demonstrated similar protective effects for the other three exposure profiles. CONCLUSIONS: For a similar level of exposure to established carcinogens, individuals with the MPO A-allele genotypes appear to have a reduced risk of lung cancer.     

Cigarette smoking and risk of Hodgkin's disease: a population-based case-control study

Previous reports offer limited support for an association between cigarette smoking and Hodgkin's disease. The authors investigated dose-response effects for smoking in relation to the risk of Hodgkin's disease using data from the Selected Cancers Study. Cases (n = 343) were men aged 32-60 years identified from eight US population-based cancer registries in 1984-1988. Controls (n = 1,910) were men recruited by random digit telephone dialing and frequency matched to cases by age and registry. Conditional logistic regression was used to calculate odds ratios and 95% confidence intervals adjusted for age, registry, race/ethnicity, Jewish upbringing, education, and childhood domicile. Compared with never smokers, current smokers had a significantly increased risk of Hodgkin's disease (odds ratio (OR) = 1.8, 95% confidence interval (CI): 1.3, 2.9). Risks increased linearly (p < 0.001) with increasing packs per day (OR(>or=2) = 2.5, 95% CI: 1.6, 4.0), years (OR(>or=30) = 2.4, 95% CI: 1.5, 3.9), and pack-years (OR(>40) = 2.7, 95% CI: 1.8, 4.3) of smoking. These associations were significant for the nodular sclerosis and mixed cellularity subtypes but were much stronger for mixed cellularity. Stratified analyses by age (42 years) and subtype suggested that the effects of smoking are more closely related to histology than age. In contrast to findings from previous studies, these data suggest that smoking is an important preventable risk factor for Hodgkin's disease.     

脂氧酶12 -183G＞A变异影响非小细胞肺癌发病风险

摘要:目的　探讨位于脂氧酶12（LOX12）基因启动子区-183G＞A单核苷酸多态与非小细胞肺癌发病风险之间的关系。方法　选取非小细胞肺癌患者956例及健康对照994例,利用PCR-限制性片段长度多态性方法进行基因分型,以多变量Logistic回归分析比值比（OR）及其95%可信区间（95%CI）。结果　LOX12 -183GG、GA、AA各基因型频率在病例组分别是20.8%、53.6%、25.6%,在正常对照组分别为26.8%、52.2%、21.0%。与-183GG基因型相比,AA基因型明显增加非小细胞肺癌的发病风险,其OR（95%CI）为1.53（1.17～2.00）;而GA基因型并不增加非小细胞肺癌发病风险,其OR（95%CI）值为1.23（0.98～1.55）。吸烟分层分析显示,以携带-183GG基因型的不吸烟者为参照,携带-183AA基因型的重度吸烟者发生非小细胞肺癌的风险为9.12（95% CI:5.07～16.41,P＜0.001）,大于不吸烟但携带-183AA 基因型者的OR值（OR＝2.03,95% CI:1.34～3.09,P＝0.001）与重度吸烟但携带-183GG基因型OR值（OR＝6.84,95%CI:3.81～12.31,P＜0.001）之和。结论　LOX12 基因启动子区-183G＞A单核苷酸多态可与吸烟交互作用共同增加非小细胞肺癌发病风险。     

Snuff use and smoking in U.S. men: implications for harm reduction

BACKGROUND: Encouraging smokers to switch to snuff may have unintended public health implications. This study examined the associations between snuff use and smoking in a representative sample of U.S. men. METHODS: Subjects were males aged >or=18 years in the National Health Interview Survey (N=13,865). The data analysis was conducted between August 2001 and April 2002. Multiple logistic regression modeling was used to examine the association between using snuff and quitting smoking. RESULTS: In 1998, 26.4% of U.S. men smoked, 3.6% used snuff, and 1.1% used both products. Adjusting for age and race/ethnicity, current smoking was most prevalent among males who used snuff on some days (38.9%) and lowest among those who used snuff every day (19.2%). Daily snuff users were significantly more likely than never-users to have quit smoking in the preceding 12 months (odds ratio [OR]=4.23; 95% confidence interval [CI]=2.16-8.28). However, U.S. men were more likely to be former snuff users who currently smoked (2.5%) than to be former smokers who currently used snuff (1.0%). Occasional snuff users (some day users) were more likely than never users to have tried to quit smoking in the preceding year (OR=1.69; 95% CI=1.04-2.76) but tended to be less likely to succeed (OR=0.50; 95% CI=0.19-1.33). CONCLUSIONS: Some men may use snuff to quit smoking, but U.S. men more commonly switch from snuff use to smoking. Some smokers may use snuff to supplement their nicotine intake, and smokers who also use snuff are more likely than nonusers to try to quit smoking but tend to have less success.     

Genetic variation in metabolic genes, occupational solvent exposure, and risk of non-hodgkin lymphoma

Using 1996-2000 data among Connecticut women, the authors evaluated whether genetic variation in 4 metabolic genes modifies organic solvent associations with non-Hodgkin lymphoma and 5 major histologic subtypes. P(interaction) values were determined from cross-product terms between dichotomous (ever/never) solvent variables and genotypes at examined loci in unconditional logistic regression models. The false discovery rate method was used to account for multiple comparisons. Overall associations between the chlorinated solvents dichloromethane (odds ratio (OR) = 1.69, 95% confidence interval (CI): 1.06, 2.69), carbon tetrachloride (OR = 2.33, 95% CI: 1.23, 4.40), and methyl chloride (OR = 1.44, 95% CI: 0.94, 2.20) and total non-Hodgkin lymphoma were increased among women TT for rs2070673 in the cytochrome P4502E1 gene, CYP2E1 (dichloromethane: OR = 4.42, 95% CI: 2.03, 9.62; P(interaction) < 0.01; carbon tetrachloride: OR = 5.08, 95% CI: 1.82, 14.15; P(interaction) = 0.04; and methyl chloride: OR = 2.37, 95% CI: 1.24, 4.51; P(interaction) = 0.03). In contrast, no effects of these solvents were observed among TA/AA women. Similar patterns were observed for diffuse large B-cell lymphoma and follicular lymphoma, as well as marginal zone lymphoma for dichloromethane. The weak, nonsignificant overall association between benzene and diffuse large B-cell lymphoma (OR = 1.29, 95% CI: 0.84, 1.98) was increased among women AA for rs2234922 in the microsomal epoxide hydrolase gene, EPHX1 (OR = 1.77, 95% CI: 1.06, 2.97; P(interaction) = 0.06). In contrast, no effect was observed among AG/GG women. Additional studies with larger sample size are needed to replicate these findings.     

Parkinson's disease risks associated with cigarette smoking, alcohol consumption, and caffeine intake

A reduced risk for Parkinson's disease (PD) among cigarette smokers has been observed consistently during the past 30 years. Recent evidence suggests that caffeine may also be protective. Findings are presented regarding associations of PD with smoking, caffeine intake, and alcohol consumption from a case-control study conducted in western Washington State in 1992-2000. Incident PD cases (n = 210) and controls (n = 347), frequency matched on gender and age were identified from enrollees of the Group Health Cooperative health maintenance organization. Exposure data were obtained by in-person questionnaires. Ever having smoked cigarettes was associated with a reduced risk of PD (odds ratio (OR) = 0.5, 95% confidence interval (CI): 0.4, 0.8). A stronger relation was found among current smokers (OR = 0.3, 95% CI: 0.1, 0.7) than among ex-smokers (OR = 0.6, 95% CI: 0.4, 0.9), and there was an inverse gradient with pack-years smoked (trend p < 0.001). No associations were detected for coffee consumption or total caffeine intake or for alcohol consumption. However, reduced risks were observed for consumption of 2 cups/day or more of tea (OR = 0.4, 95% CI: 0.2, 0.9) and two or more cola drinks/day (OR = 0.6, 95% CI: 0.3, 1.4). The associations for tea and cola drinks were not confounded by smoking or coffee consumption.     

Do favorite movie stars influence adolescent smoking initiation?

OBJECTIVES: We sought to determine whether adolescents whose favorite movie stars smoke on-screen are at increased risk of tobacco use. METHODS: During interviews, adolescent never smokers taking part in the California Tobacco Survey nominated their favorite stars. We reviewed popular films released during 1994 through 1996 to determine whether stars smoked on-screen in at least 2 films. RESULTS: One third of never smokers nominated a star who smoked on-screen, which independently predicted later smoking risk (odds ratio [OR] = 1.36; 95% confidence interval [CI] = 1.02, 1.82). The effect was strong among girls (OR = 1.86; 95% CI = 1.26, 2.73). Among boys, there was no independent effect after control for receptivity to tobacco industry promotions. CONCLUSIONS: Public health efforts to reduce adolescent smoking must confront smoking in films as a tobacco marketing strategy.