Case-control study of lifetime total physical activity and prostate cancer risk

A population-based case-control study of physical activity and prostate cancer risk was conducted in Alberta, Canada, between 1997 and 2000. A total of 988 incident, histologically confirmed cases of stage T2 or greater prostate cancer were frequency matched to 1,063 population controls. The Lifetime Total Physical Activity Questionnaire was used to measure occupational, household, and recreational activity levels from childhood until diagnosis. Multivariable logistic regression analyses were conducted. No association for total lifetime physical activity and prostate cancer risk was found (odds ratio (OR) for > or =203 vs. <115 metabolic equivalent-hours/week/year=0.87, 95% confidence interval (CI): 0.65, 1.17). By type of activity, the risks were decreased for occupational (OR=0.90, 95% CI: 0.66, 1.22) and recreational (OR=0.80, 95% CI: 0.61, 1.05) activity but were increased for household (OR=1.36, 95% CI: 1.05, 1.76) activity when comparing the highest and lowest quartiles. For activity performed at different age periods throughout life, activity done during the first 18 years of life (OR=0.78, 95% CI: 0.59, 1.04) decreased risk. When activity was examined by intensity of activity (i.e., low, <3; moderate, 3-6; and vigorous, >6 metabolic equivalents), vigorous activity decreased prostate cancer risk (OR=0.70, 95% CI: 0.54, 0.92). This study provides inconsistent evidence for the association between physical activity and prostate cancer risk.     

Case-control study of physical activity and breast cancer risk among premenopausal women in Germany

Important aspects of the recognized inverse relation between physical activity and breast cancer risk are still under discussion. Data on physical activity from sports, occupational activity, household tasks, walking, and cycling by reported frequency, duration, and intensity during adolescence and young adulthood were collected in 1999-2000 from 360 premenopausal breast cancer cases and 886 controls who had previously participated in a German population-based case-control study. In multivariate conditional logistic regression, no association between total physical activity and premenopausal breast cancer was found in two age periods. For women who were active during both periods, the adjusted odds ratio was 0.83 (95% confidence interval: 0.60, 1.14). When both age periods were combined, higher quartiles of total physical activity compared with the lowest quartile showed adjusted odds ratios of 0.97, 0.68, and 0.94. Only the effect of moderately high physical activity was statistically significant. Analyses by type of activity revealed significant protective effects for women who reported the highest levels of cycling activities (adjusted odds ratio = 0.66, 95% confidence interval: 0.45, 0.97). These data do not suggest an inverse monotonic association between total physical activity and breast cancer risk in premenopausal women. The study prevalence of cycling and walking for transportation demonstrated that national habits need consideration in the exposure assessment.     

Adulthood lifetime physical activity and breast cancer

BACKGROUND: Epidemiologic studies have shown that breast cancer risk is reduced 30% to 40% in highly physically active compared with inactive women. However, the effects of moderate activities, timing of activities, and intervening effects of other risk factors remain less clear. METHODS: We analyzed data on physical activity patterns in 2176 incident breast cancer cases and 2326 controls in a population-based breast cancer case-control study in Poland conducted in 2000-2003. Using unconditional logistic regression analyses, we calculated odds ratios (ORs) and 95% confidence intervals (CIs) associated with physical activity levels (measured by average metabolic equivalents of energy expenditure hours per week), controlling for potential confounders. RESULTS: Total adult lifetime activity reduced risk of breast cancer, with individuals in the highest quartile having an OR of 0.80 (CI = 0.67-0.96) compared with the lowest quartile. Reduced risks were most consistent for the highest quartiles of moderate-to-vigorous activities: moderate/vigorous recreational activities (OR = 0.74; CI = 0.62-0.89), outdoor activities (0.81; 0.68-0.97), heavy physical work (0.60; 0.42-0.87), and combined high intensity (metabolic equivalent >6.0) activities (0.75; 0.63-0.90). These relations were not modified by body mass index, menopausal status, or family history of breast cancer. Reductions in risk with moderate/vigorous recreational activities were stronger for larger tumors and those with nodal involvement. Women who increased their recreational activity in their 50s had significantly reduced risk, with those in the highest tertile of change being at a 27% lower risk. CONCLUSIONS: Leisure-time moderate-to-vigorous activities reduce breast cancer risk irrespective of underlying host characteristics.     

Occupational physical activity and breast cancer risk in the upper Cape Cod cancer incidence study.

BACKGROUND: In several epidemiological studies, breast cancer risk has been reduced among women who reported high levels of occupational or leisure-time physical activity. We used data from a population-based case control study to evaluate the effect of occupational physical activity on breast cancer risk. METHODS: Two hundred-thirty three incident cases of breast cancer and 670 controls or their next of kin were interviewed for information on breast cancer risk factors and a complete job history. Physical activity level of jobs were classified using a Department of Labor rating scheme. We calculated adjusted odds ratios for light and medium/heavy activity jobs compared to sedentary jobs. RESULTS: Odds ratios for women who held medium/heavy jobs for less than 10 years and more than ten years were, respectively, 0.7 (95% CI = 0.4,1.3) and 1.7 (95% CI = 0.9,3.3). CONCLUSIONS: In these data there was no evidence that holding a job of medium/heavy activity reduced breast cancer risk. The study was limited by misclassification inherent in the occupational exposure scheme and by the lack of information on leisure time physical activity. The modest risk increase for subjects holding a medium/heavy job for at least 10 years probably represents either confounding or random variation.     

前列腺癌与生活行为方式病例对照研究

目的探讨前列腺癌与生活行为方式的病因学关系。方法选择在中山大学4所附属医院诊断的前列腺癌患者62例，选择良性前列腺增生、其他疾病患者各62例为对照（1：2配对），匹配条件为年龄组（±5岁）、性别、民族和居住地类型相同。调查以面谈为主，辅以病历记录，采用条件Logistic回归法分析数据。结果以前列腺增生为对照。吸烟量每天20支及以上者患前列腺癌的危险是不吸烟者的2．19（0．87～5．52）倍；年吸烟量达800支以上者患前列腺癌的危险是不吸烟者的2．08（0．81～12．679）倍。以其他病例为对照，日饮酒量超过100g（乙醇）者患前列腺癌的危险是不饮酒者的2．17（0．7～6．63）倍；饮酒年限达40年及以上者患前列腺癌的危险是不饮酒者的3．35（O．89～5．30）倍。体育锻炼频率每周少于5次增加前列腺癌的患病危险，OR〈3次／周=6．68（0．46-97．58），OR3-5次／周=8．48（1．37～52．61）。未发现饮茶与前列腺癌有统计学关联。结论吸烟是前列腺癌的危险因素，饮酒年限长者和缺乏锻炼者易患前列腺癌．     

卵巢癌危险因素的病例对照研究

卵巢癌严重威胁妇女健康 ,其死亡率居妇科恶性肿瘤首位[1 ] 。近十几年来 ,我国卵巢癌的发病率呈逐年上升之趋势 ;而且 ,将近 80 %的上皮性卵巢癌确诊时已为Ⅲ、Ⅳ期[2 ] 。因而 ,有必要对我国卵巢癌的发病及其影响因素进行深一步的研究。1 .对象与方法 :(1 )研究对象 :病例选自 1 999年 3月至 2 0 0 1年 1 2月天津医科大学附属肿瘤医院及天津市中心妇产科医院住院患者 ,均被确诊为卵巢癌 ,共 1 0 2例。1 0 2名对照来自与病例居住地相同或相似的社区正常健康人 ,并且于病例确诊时随机选取。两组在年龄 (χ2 =4.373 ,P =0 .82 2 )、民族 (χ…     

Case-control study of occupational exposures and male breast cancer

OBJECTIVE: To investigate whether risk of male breast cancer is associated with workplace exposures. METHODS: A case-control study of 178 cases of male breast cancer and 1041 controls was carried out with data from the United States national mortality follow-back survey, which collected questionnaire information from proxy respondents of a 1% sample of all 1986 United States deaths among subjects aged 25-74 years. Occupational exposure to electromagnetic fields, high temperatures, polycyclic aromatic hydrocarbons (PAHs), herbicides, other pesticides, and organic solvents was assessed by applying job- exposure matrices, based on the 1980 United States census occupation and industry codes, to the longest job held by study subjects as reported by the informants. A socioeconomic status index was created by combining information on annual family income, education, assets, and occupation to assess the association of socioeconomic status with male breast cancer. Relative risks were derived from logistic regression modelling, which included age, socioeconomic status, marital status, and body mass index, as well as occupational exposures. RESULTS: Risk for male breast cancer increased significantly with increasing socioeconomic status index (test for trend: p < 0.01), but the risks associated with individual socioeconomic status variables were smaller and the trends were not significant. A significant increase in risk of male breast cancer was associated with employment in blast furnaces, steel works, and rolling mills (odds ratio (OR) 3.4; 95% confidence interval (95% CI) 1.1 to 10.1, based on six cases), and motor vehicle manufacturing (OR 3.1; 95% CI 1.2 to 8.2, based on seven cases). However, exposures to electromagnetic fields, high temperature, PAHs, herbicides, other pesticides, and organic solvents were not associated with risk of male breast cancer. CONCLUSIONS: The role of workplace exposures in increasing risk of breast cancer among men employed in motor vehicle manufacturing and in blast furnaces, steel works, and rolling mills deserves further investigation. The finding on socioeconomic status suggests that, as well as reproductive factors, other lifestyle factors such as diet that may be related to high socioeconomic status in men should be investigated further.

 

     

胃癌危险因素病例对照研究

目的调查本溪地区胃癌发生危险因素，为胃癌防治提供科学依据。方法采用1：1配对病例对照研究方法，问卷调查2002年2月～2004年2月经病理组织学确诊的新发胃癌298例，对可疑致癌因素进行Logistic回归模型单因素和多因素分析，筛选与胃癌发生有关的危险因素。结果缺乏体育锻炼、精神压抑、吸烟量大、喜食烟熏食品、喜食重盐饮食、过量摄入动物肉类、幽门螺杆菌感染、胃溃疡、恶性肿瘤家族史是胃癌的危险因素，OR值依次为2．181，19．502，2．920，6．985，3．013，12．882，32．624，13．006，5．550。喜食香菇和蘑菇(OR=0．443)、喜食新鲜水果(OR=0．665)是胃癌的保护因素。结论本溪地区胃癌发生主要与幽门螺杆菌感染、精神压抑、胃溃疡史、过量摄入肉类、缺乏体育锻炼等因素有关，应开展幽门螺杆菌检测，提倡保持心理平衡，适当进行体育锻炼；经常进食香菇、蘑菇和新鲜水果，以有效预防胃癌。     

山东省大汶河流域食管癌发病影响因素分析

目的 探讨山东省大汶河流域食管癌发病的影响因素.方法 在山东省大汶河主干流域的宁阳县,采用1:1配对病例对照研究方法,对195例食管癌现患及其对照进行问卷调查.结果 多因素条件Logistic回归分析结果显示,干硬饮食(OR=5.850,95%CI=1.080~31.693)、吸自制烟(OR=16.158,95%CI=2.529~103.259)、每天饮酒量>500 ml(OR=11.513,95%CI=1.0625~124.837)、疾病家族史(OR=1.827,95%CI=1.016~3.285)及饮茶(OR=0.311,95%CI=0.148~0.652)等因素2组比较差异有统计学意义.结论 大汶河流域食管癌高发不仅与环境、饮食因素有关,而且与食管癌家族史有关,应进行深入的研究并采取相应的综合性防治措施.     

Case-control study of dietary patterns and endometrial cancer risk

Dietary patterns, rather than intakes of specific foods or nutrients, may influence risk of endometrial cancer (EC). This population-based case-control study in Canada (2002-2006) included incident EC cases (n = 506) from the Alberta Cancer Registry and controls frequency age-matched to cases (n = 981). Past-year dietary patterns were defined using factor analysis of food frequency questionnaire data. Logistic regression was used to estimate EC risk within quartiles of dietary patterns. Three patterns (sweets, meat, plants) explained 23% of the variance in the dietary data. In multivariable models, EC risk was significantly reduced by 30% for women in the highest quartile of the healthier plants pattern (OR = 0.70, 95% CI 0.50-0.98, P trend = 0.02). When stratified by body mass index (BMI; kg/m(2)), risk was further reduced among overweight or obese women with a BMI ≥25 (OR = 0.57, 95% CI 0.39-0.83; P trend = 0.004). EC was not associated with the less healthy sweets and meat patterns. However, risk was modestly, but not significantly, elevated for higher intakes of the meat pattern among overweight or obese women. A mostly plant-based dietary pattern may reduce EC risk. Recommendations for risk reduction should focus on maintaining a healthy weight and the role of diet should be studied further.     

The effect of physical activity on breast cancer risk: A cohort study of 30,548 women

Background: In epidemiological studies abundant physical activity has been related to decreased breast cancer risk, though the results have been inconsistent. The purpose of this paper was to study the association of physical activity at leisure and commuting to work and incidence of breast cancer. Methods: The study cohort consisted of 30,548 female participants of the Finnish adult health behaviour survey, based on annual random samples of Finns aged 15–64, collected in 1978–1993. By the end of 1995, 332 breast cancer cases had been diagnosed in the cohort. Relative risks of breast cancer were adjusted for age at survey, body mass index (BMI), education, length of follow-up, parity and age at first birth using Poisson regression models. Results: Compared to women exercising less than once a week, the adjusted relative risk of breast cancer for women exercising once a week was 0.80 (95% confidence interval (CI): 0.58–1.10), for women exercising 2–3 times per week 0.92 (95% CI: 0.78–1.22) and for women exercising daily 1.01 (95% CI: 0.72–1.42). Women who reported commuting, walking or bicycling to work 30 min or more daily had slightly lower adjusted risk of breast cancer (RR: 0.87, 95% CI: 0.62–1.24) than women working at home, being unemployed or driving a car to working place. Conclusion: Although a small protective effect of regular physical activity for breast cancer incidence was found in physical activity when commuting to work, the role of the physical activity in breast cancer prevention is still an open question.     

宫内节育器与子宫内膜癌病例对照研究

目的探讨宫内节育器（IUD）使用与子宫内膜癌的关系。方法采用病例对照研究方法，调查上海市区1997年1月～2000年12月间确诊、年龄在30～69岁之间的子宫内膜癌患者（n=1204）和普通对照人群（n=1212）的一般情况、月经生育史、饮食、个人生活习惯、口服避孕药（OC）及宫内节育器使用情况、疾病及家族史等。采用非条件Logisfic回归模型分析宫内节育器使用与子宫内膜癌的关系。结果上海市区女性所使用的宫内节育器类型主要为金属环和V型塑料环。分别占使用者的68．1％和20．7％。与从未使用过宫内节育器的女性比较，使用者发生子宫内膜癌的危险性显著降低。调整后OR=0．57（95％CI=0．47～0．69），且随使用时间增加而降低。分层分析显示，在从未服用口服避孕药的女性中，曾使用IUD者发生子宫内膜癌的危险降低，OR=0．51（95％CI=0．41～0．64）。结论绝经前后女性使用宫内节育器可能会降低子宫内膜癌的风险。     

Self-experienced physical workload and risk of breast cancer

OBJECTIVES: The association between the risk of breast cancer and the physical load of work was studied because physical activity may reduce breast cancer risk via hormonal mechanisms. METHODS: Occupational physical activity was estimated from a self-determined rating [scale 1 (low)-5 (high)] of occupational physical load for 1800 randomly selected women born in 1930-1969. The medians of the ratings were used as occupation-specific indices of occupational physical activity. All 65 occupations with at least 5 ratings, covering 75% of the economically active female population in Finland, were included in further analyses. The occupation-specific numbers of observed and expected cases of breast cancer during 1971-1995 among women born in 1906-1945 (17,986 cases) were grouped according to the index for occupational physical activity. Expected rates were calculated with the social-class-specific population and the entire Finnish female population as reference populations. The relative risks (RR) of breast cancer for categories 3-5, in comparison with categories 1-2 were calculated using Poisson regression models. The occupation-specific mean number of children and mean age at first childbirth were adjusted for. RESULTS: The RR was lower for occupations in category 5 than for those in categories 1-4, especially in the youngest (25-39 years) age group (RR 0.51, 95% confidence interval 0.44-0.58). Adjustment for social class and reproductive factors raised the RR (95% confidence interval 0.56-0.74) for category 5 in different age strata, all the RR values still being statistically significant. CONCLUSIONS: The results support the hypothesis that occupational physical activity, if high enough, markedly reduces breast cancer risk.     

体力活动与女性乳腺癌发病关系的病例对照研究

目的 探讨体力活动与乳腺癌发病的关系。方法 采用以医院为基础的病例对照研究,调查某大学2所附属医院2012年4月~2014年12月间确诊的25～70岁549例乳腺癌患者和同期同医院就诊的549例非肿瘤患者的体力活动情况和相关危险因素。采用非条件Logistic回归模型分析体力活动与乳腺癌发病的关系。结果 校正各种混杂因素后,非职业性体力活动与乳腺癌发病风险降低有关（OR=0.69,95% CI：0.48～1.00）;与不参加体育活动者相比,参加体育活动对乳腺癌发病有保护作用（OR=0.61,95% CI：0.43～0.87）;与久坐不动的职业相比,轻度职业活动对乳腺癌发病有保护作用（OR=0.67,95% CI：0.47～0.97）,而家务活动与乳腺癌发病风险无关。不同雌激素受体（estrogen receptor,ER）和孕激素受体（progesterone receptor,PR）状态的亚组分析中,非职业性体力活动与ER+/PR+乳腺癌的发病风险降低有关。结论 非职业性体力活动、体育活动和轻度职业活动对女性乳腺癌有保护作用。     

Case-control study of cancer risk in tetraethyl lead manufacturing

A case-control study was conducted to investigate the relative risk of cancer detection among Du Pont employees who worked in a tetraethyl lead (TEL) manufacturing area. The study's objective was to determine whether the employees' risk of developing or dying from cancer was associated with occupational exposure to TEL. All malignant neoplasms detected in the active and pensioned employee population during the period 1956–1987 were studied. TEL exposure was estimated by the following measures: ever employed in the TEL area, years of employment in TEL, TEL exposure rank, and the TEL cumulative exposure index. TEL manufacturing exposed employees to both organic and inorganic lead compounds. Because the underlying data did not permit the exposure assessment to distinguish between organic and inorganic lead, the TEL exposure measures reflect exposure to the TEL manufacturing process itself. The effects of latency, cigarette smoking habits, and exposures to other known or suspected carcinogens at the plant were also assessed. A strong association was observed between exposure to the TEL manufacturing process and rectal cancer (the odds ratio was 3.7 with 90% confidence limits of 1.3–10.2 for the analysis of ever/never exposed to TEL). An exposure-response relationship was noted with a fourfold elevation in the odds ratio at the high-very high cumulative exposure level. These patterns were even more pronounced after assuming a 10 year latency. Similar results were obtained for cancers of the sigmoid colon. These findings suggest that exposure to the TEL manufacturing process may have played a causal role in the colorectal cancer experience at the plant. This position is supported by the graded exposure-response relationships, the consistency of the results across exposure measures, the specificity of the health outcome (i.e., colorectal cancer), and the strength of the association. However, the evidence for causality is not compelling. This is the first report of an association between TEL manufacturing and colorectal cancer, and the evidence is compatible with a wide range of causal (i.e., indirect vs. direct acting; initiating vs. promoting) and noncausal (i.e., statistical and methodological bias; coincidence) interpretations. Am. J. Ind. Med. 31:28–35 © 1997 Wiley-Liss, Inc.     

Lifetime occupational physical activity and prostate cancer risk

The authors compared the lifetime occupational physical activity of 452 prostate cancer cases identified through the population-based Hawaii Tumor Registry and 899 population controls interviewed from 1981 to 1983. Each job reported was classified into one of five levels of physical activity using published sources. Among men aged 70 years or older, a negative association was found between prostate cancer risk and proportion of life spent in jobs involving only sedentary or light work. Compared with men never employed in such jobs, men who spent more than 54% of their life in these jobs had an odds ratio of 0.5 (95% confidence interval 0.3-0.9). This negative association was dose-dependent, consistent across ethnic groups, and unrelated to socioeconomic status, dietary risk factors, or job-related chemical exposures. The findings for younger men were less clear, but not inconsistent with those for older men. Surprisingly, no association was found with years spent in moderately active or very active jobs in either age group. Although inconclusive, these results suggest that physical activity may be positively associated with the risk of prostate cancer, but this association is likely to be weak and indirect.     

Recreational physical activity and endometrial cancer risk.

To investigate the association between recreational physical activity and endometrial cancer risk, a population-based case-control study was conducted in Washington State. The study included 822 incident cases of endometrial cancer diagnosed between 1985 and 1991 and 1,111 randomly selected population-based controls. Detailed information on recreational physical activities as well as other endometrial cancer risk factors was obtained in structured, in-person interviews. Unconditional logistic regression, adjusted for age, county, energy intake, unopposed estrogen use, income, and, in separate models, body mass index (kg/m(2)), was used to estimate the odds ratios and their 95% confidence intervals, relating endometrial cancer to each level of physical activity. A greater proportion of controls (49.3%) than cases (40.5%) reported doing regular exercise (compared with no exercise: adjusted odds ratio = 0.62, 95% confidence interval: 0.51, 0.76) in the 2-year period prior to diagnosis date. There was little evidence of a trend of decreasing risk with increasing duration or intensity of recreational physical activities. These results provide support for an association between the lack of recent recreational physical activity and endometrial cancer risk. However, the absence of a difference by duration or intensity levels and the inconsistent results from other studies suggest caution before interpreting this association as causal.     

安溪县食管癌发病影响因素病例对照调查

目的探讨福建省安溪县食管癌发病的影响因素，为食管癌高发区制定综合防制措施提供理论依据。方法采用1：1配对研究方法，对237例食管癌患者及与之在年龄、性别和居住地相匹配的非癌人群采用统一的调查表进行问卷调查。采用单因素及多因素条件Logistic分析方法分析安溪县食管癌发生的影响因素。结果食盐量(OR 3．704)、性格内向(OR13．511)、吸烟量(OR1．667)、一级亲属食管癌家族史(OR5．687)、病前10～20年前常食用油炸食品(OR2．577)、霉变红薯(OR4．803)、腌菜(OR2．285)是安溪县食管癌发生的危险因素；常饮茶(OR0．234)、饮用清洁水(OR0．142)、常吃豆制品(OR0．407)、水果(OR0．255)是保护因素。结论食管癌是一种由多种致癌因素引起疾病，即在环境危险因素和遗传因素的作用下发生，因此，对其应采取综合性的预防措施。     

A prospective cohort study of the combined effects of physical activity and anthropometric measures on the risk of post-menopausal breast cancer

Although keeping a healthy weight and being physically active are among the few modifiable risk factors for post-menopausal breast cancer, the possible interaction between these two risk factors remains to be established. We analyzed prospectively a cohort of 19,196 women who provided detailed self-report on anthropometric measures, physical activity and possible confounders at enrollment in 1997. We achieved complete follow-up through 2010 and ascertained 609 incident cases of post-menopausal invasive breast cancer. We calculated metabolic energy turnover (MET h/day) per day and fitted Cox proportional hazards models to estimate hazard ratios (HRs) with 95 % confidence intervals (CIs). The incidence of post-menopausal breast cancer among obese women (BMI ≥ 30 kg/m²) was 58 % higher (HR 1.58, CI 1.16–2.16) than in women of normal weight (18.5 ≤ BMI < 25). Women in the lowest tertile of total physical activity (< 31.2 MET h/day) had 40 % higher incidence of post-menopausal breast cancer (HR 1.40, CI 1.11–1.75) than those in the highest tertile (≥ 38.2 MET h/day). The excess incidence linked to these two factors seemed to combine in an approximately additive manner; the incidence among the most obese and sedentary women was doubled (HR 2.07, CI 1.31–3.25) compared with the most physically active women with normal weight. No heterogeneity of the physical activity-linked risk ratios across strata of BMI was detected (p value for interaction = 0.98). This prospective study revealed dose-dependent, homogenous inverse associations between post-menopausal breast cancer incidence and physical activity across all strata of BMI, and between post-menopausal breast cancer incidence and BMI across all strata of physical activity, with no evidence of additive or multiplicative interaction between the two, suggesting independent effects.