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Sritharan J, MacLeod JS, McLeod CB, Peter A, Demers PA. Prostate cancer risk by occupation in the Occupational Disease Surveillance System (ODSS) in Ontario, Canada. HEALTH PROMOTION AND CHRONIC DISEASE PREVENTION IN CANADA-RESEARCH POLICY AND PRACTICE 2019; 39:178-186. [PMID: 31091061 DOI: 10.24095/hpcdp.39.5.02] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
INTRODUCTION Previous Canadian epidemiologic studies have identified associations between occupations and prostate cancer risk, though evidence is limited. However, there are no well-established preventable risk factors for prostate cancer, which warrants the need for further investigation into occupational factors to strengthen existing evidence. This study uses occupation and prostate cancer information from a large surveillance cohort in Ontario that linked workers' compensation claim data to administrative health databases. METHODS Occupations were examined using the Occupational Disease Surveillance System (ODSS). ODSS included 1 231 177 male workers for the 1983 to 2015 period, whose records were linked to the Ontario Cancer Registry (OCR) in order to identify and follow up on prostate cancer diagnoses. Cox proportional hazard models were used to calculate age-adjusted hazard ratios and 95% CI to estimate the risk of prostate cancer by occupation group. RESULTS A total of 34 997 prostate cancer cases were diagnosed among workers in ODSS. Overall, elevated prostate cancer risk was observed for men employed in management/ administration (HR 2.17, 95% CI = 1.98-2.38), teaching (HR 1.99, 95% CI = 1.79-2.21), transportation (HR 1.20, 95% CI = 1.16-1.24), construction (HR 1.09, 95% CI = 1.06-1.12), firefighting (HR 1.62, 95% CI = 1.47-1.78), and police work (HR 1.20, 95% CI = 1.10-1.32). Inconsistent findings were observed for clerical and farming occupations. CONCLUSION Associations observed in white collar, construction, transportation, and protective services occupations were consistent with previous Canadian studies. Findings emphasize the need to assess job-specific exposures, sedentary behaviour, psychological stress, and shift work. Understanding specific occupational risk factors can lead to better understanding of prostate cancer etiology and improve prevention strategies.
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Affiliation(s)
- Jeavana Sritharan
- Occupational Cancer Research Centre, Cancer Care Ontario, Toronto, Ontario, Canada
| | - Jill S MacLeod
- Occupational Cancer Research Centre, Cancer Care Ontario, Toronto, Ontario, Canada
| | - Christopher B McLeod
- School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada.,Institute for Work & Health, Toronto, Ontario, Canada
| | - Alice Peter
- Population Health and Prevention, Cancer Care Ontario, Toronto, Ontario, Canada
| | - Paul A Demers
- Occupational Cancer Research Centre, Cancer Care Ontario, Toronto, Ontario, Canada.,Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
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Benke IN, Leitzmann MF, Behrens G, Schmid D. Physical activity in relation to risk of prostate cancer: a systematic review and meta-analysis. Ann Oncol 2019; 29:1154-1179. [PMID: 29788165 DOI: 10.1093/annonc/mdy073] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Background Prostate cancer (PCa) is one of the most common cancers among men, yet little is known about its modifiable risk and protective factors. This study aims to quantitatively summarize observational studies relating physical activity (PA) to PCa incidence and mortality. Materials and methods Published articles pertaining to PA and PCa incidence and mortality were retrieved in July 2017 using the Medline and EMBASE databases. The literature review yielded 48 cohort studies and 24 case-control studies with a total of 151 748 PCa cases. The mean age of the study participants at baseline was 61 years. Results In random-effects models, comparing the highest versus the lowest level of overall PA showed a summary relative risk (RR) estimate for total PCa incidence close to the null [RR = 0.99, 95% confidence interval (CI) = 0.94-1.04]. The corresponding RRs for advanced and non-advanced PCa were 0.92 (95% CI = 0.80-1.06) and 0.95 (95% CI = 0.85-1.07), respectively. We noted a statistically significant inverse association between long-term occupational activity and total PCa (RR = 0.83, 95% CI = 0.71-0.98, n studies = 13), although that finding became statistically non-significant when individual studies were removed from the analysis. When evaluated by cancer subtype, an inverse association with long-term occupational activity was noted for non-advanced/non-aggressive PCa (RR = 0.51, 95% CI = 0.37-0.71, n studies = 2) and regular recreational activity was inversely related to advanced/aggressive PCa (RR = 0.75, 95% CI = 0.60-0.95, n studies = 2), although these observations are based on a low number of studies. Moreover, PA after diagnosis was related to reduced risk of PCa mortality among survivors of PCa (summary RR based on four studies = 0.69, 95% CI = 0.55-0.85). Conclusions Whether PA protects against PCa remains elusive. Further investigation taking into account the complex clinical and pathologic nature of PCa is needed to clarify the PA and PCa incidence relation. Moreover, future studies are needed to confirm whether PA after diagnosis reduces risk of PCa mortality.
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Affiliation(s)
- I N Benke
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - M F Leitzmann
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - G Behrens
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - D Schmid
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany.
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Krstev S, Knutsson A. Occupational Risk Factors for Prostate Cancer: A Meta-analysis. J Cancer Prev 2019; 24:91-111. [PMID: 31360689 PMCID: PMC6619854 DOI: 10.15430/jcp.2019.24.2.91] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/20/2019] [Accepted: 03/20/2019] [Indexed: 01/20/2023] Open
Abstract
Prostate cancer is the second most common cancer in men worldwide. There are many occupational factors that have been suggested to cause prostate cancer. Our aim was to evaluate the evidence for causality by a literature review of occupational factors. We searched literature in Medline and SCOPUS from 1966 to June 30, 2015 to identify occupational risk factors for prostate cancer. The following risk factors were selected: farmers/agricultural workers, pesticides - whole group, and separately organophosphate and organochlorine pesticides, carbamates and triazines, cadmium, chromium, cutting fluids, acrylonitrile, rubber manufacturing, whole body vibration, shift work, flight personnel, ionizing radiation, and occupational physical activity. For each factor a literature search was performed and presented as meta-analysis of relative risk and heterogeneity (Q and I2 index). A total of 168 original studies met the inclusion criteria with 90,688 prostate cancer cases. Significantly increased risks were observed for the following occupational exposures: pesticides (metaRR = 1.15, 95% confidence interval [CI] = 1.01-1.32; I2 = 84%), and specifically group of organochlorine pesticides (meta relative risk [metaRR] = 1.08, 95% CI = 1.03-1.14; I2 = 0%), chromium (metaRR = 1.19, 95% CI = 1.07-1.34; I2 = 31%), shift work (metaRR = 1.25, 95% CI = 1.05-1.49; I2 = 78%) and pilots (metaRR = 1.41, 95% CI = 1.02-1.94; I2 = 63%) and occupational physical activity in cohort studies (metaRR = 0.87, 95% CI = 0.81-0.94; I2 = 0%). The literature review supports a causal association for a few of the previously suggested factors.
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Affiliation(s)
- Srmena Krstev
- Serbian Institute of Occupational Health, Belgrade,
Serbia
| | - Anders Knutsson
- Department of Health Sciences, Mid Sweden University, Sundsvall,
Sweden
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Sormunen J, Talibov M, Sparén P, Martinsen JI, Weiderpass E, Pukkala E. Perceived Physical Strain at Work and Incidence of Prostate Cancer – a Case-Control Study in Sweden and Finland. Asian Pac J Cancer Prev 2018; 19:2331-2335. [PMID: 30141311 PMCID: PMC6171402 DOI: 10.22034/apjcp.2018.19.8.2331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 07/23/2018] [Indexed: 12/15/2022] Open
Abstract
The evidence that prostate cancer is associated to physical inactivity is inconsistent. We studied the association of perceived physical workload (PPWL) at work and incidence of prostate cancer in a case-control setting. We used data from the Nordic Occupational Cancer study from Finland and Sweden. Five population controls were selected for each prostate cancer patient, matched on age and country. We had 239,835 cases and 1,199,175 controls in our study. For each case and control we estimated cumulative PPWL based on probability, level and duration of PPWL using the NOCCA Job Exposure Matrix. We then stratified individuals as having no exposure (reference category), low physical activity (below 50th percentile of the exposed), moderate exposure (50th-90th percentile) and high exposure (90th percentile and higher). The hazard ratios for prostate cancer from the lowest to highest cumulative PPWL levels were 0.90 (95% confidence interval 0.89-0.91), 0.88 (0.87-0.89) and 0.93 (0.92-0.95). There was no statistically significant dose response effect of PPWL on prostate cancer incidence. Inclusion of socioeconomic status in the model did not substantially change the result. The results were similar before Prostate Specific Antigen (PSA) testing and during the years of PSA testing in these countries. In summary, individuals with physical strain at work had a lower risk of invasive prostate cancer as compared to individuals without physical strain at work.
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Affiliation(s)
- Jorma Sormunen
- Faculty of Social Sciences, University of Tampere, Tampere, Finland
- Tampere University Hospital, Department of Oncology, Tampere, Finland.
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Abstract
Prostate cancer affects a major proportion of older men, and effective preventive measures are few. Earlier suggestions of 10-30% risk reduction from vigorous physical activity thus merit further analysis. This narrative review updates information on associations between physical activity and prostate cancer, seeking activity patterns associated with maximal risk reduction. Systematic searches of Ovid/MEDLINE and PubMed databases from 1996 to June 2016 have linked the terms prostate neoplasms/prostate cancer with occupation, occupational title, sedentary job or heavy work, exercise, physical activity, sports, athletes, physical education/training or aerobic fitness. Combining these searches with findings from earlier reviews, 85 analyses were captured, although three were repeat analyses of the same data set. Seven analyses reported increased risk, and a further 31 showed no clear relationship. However, 24 analyses found a trend to diminished risk, and 21 a significant decrease (10-30% or more) in at least some subject subsets. Benefit was seen more consistently in occupational than in leisure studies, usually with adolescence or the early 20 s as the optimal age for preventive activity. In general, benefit showed a dose-response relationship, with vigorous activity required for maximal effect. Furthermore, several recent observational studies have indicated that physical activity is beneficial in preventing disease recurrence and improving survival following the diagnosis and treatment of prostate cancer. Despite continued research, conclusive proof of an association between regular physical activity and a low risk of prostate cancer remains elusive. However, reports that exercise exacerbates risk are few, and despite issues around controls, covariates, and co-morbidities, an impressive number of studies have now found significant benefit, suggesting that regular physical activity is important in terms of disease development, progression, and therapy. Given also the many other health benefits of an active lifestyle, it can be recommended as a potentially useful measure in the prevention of prostate cancer.
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Affiliation(s)
- Roy J Shephard
- Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON, Canada. .,, PO Box 521, Brackendale, BC, V0N 1H0, Canada.
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Sritharan J, MacLeod J, Harris S, Cole DC, Harris A, Tjepkema M, Peters PA, Demers PA. Prostate cancer surveillance by occupation and industry: the Canadian Census Health and Environment Cohort (CanCHEC). Cancer Med 2018; 7:1468-1478. [PMID: 29493883 PMCID: PMC5911573 DOI: 10.1002/cam4.1358] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 11/28/2017] [Accepted: 01/02/2018] [Indexed: 01/23/2023] Open
Abstract
As there are no well-established modifiable risk factors for prostate cancer, further evidence is needed on possible factors such as occupation. Our study uses one of the largest Canadian worker cohorts to examine occupation, industry, and prostate cancer and to assess patterns of prostate cancer rates. The Canadian Census Health and Environment Cohort (CanCHEC) was established by linking the 1991 Canadian Census Cohort to the Canadian Cancer Database (1969-2010), Canadian Mortality Database (1991-2011), and Tax Summary Files (1981-2011). A total of 37,695 prostate cancer cases were identified in men aged 25-74 based on age at diagnosis. Cox proportional hazards models were used to estimate hazards ratios and 95% confidence intervals. In men aged 25-74 years, elevated risks were observed in the following occupations: senior management (HR = 1.12, 95% CI: 1.04-1.20); office and administration (HR = 1.19, 95% CI: 1.11-1.27); finance services (HR = 1.09, 95% CI: 1.04-1.14); education (HR = 1.05, 95% CI: 1.00-1.11); agriculture and farm management (HR = 1.12, 95% CI: 1.06-1.17); farm work (HR = 1.11, 95% CI: 1.01-1.21); construction managers (HR = 1.07, 95% CI: 1.01-1.14); firefighting (HR = 1.17, 95% CI: 1.01-1.36); and police work (HR = 1.22, 95% CI: 1.09-1.36). Decreased risks were observed across other construction and transportation occupations. Results by industry were consistent with occupation results. Associations were identified for white-collar, agriculture, protective services, construction, and transportation occupations. These findings emphasize the need for further study of job-related exposures and the potential influence of nonoccupational factors such as screening practices.
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Affiliation(s)
- Jeavana Sritharan
- Occupational Cancer Research CentreCancer Care OntarioTorontoOntarioCanada
- Institute of Medical ScienceUniversity of TorontoTorontoOntarioCanada
| | - Jill MacLeod
- Occupational Cancer Research CentreCancer Care OntarioTorontoOntarioCanada
| | - Shelley Harris
- Occupational Cancer Research CentreCancer Care OntarioTorontoOntarioCanada
- Dalla Lana School of Public HealthUniversity of TorontoTorontoOntarioCanada
| | - Donald C. Cole
- Dalla Lana School of Public HealthUniversity of TorontoTorontoOntarioCanada
| | - Anne Harris
- Occupational Cancer Research CentreCancer Care OntarioTorontoOntarioCanada
- Dalla Lana School of Public HealthUniversity of TorontoTorontoOntarioCanada
- School of Occupational and Public HealthRyerson UniversityTorontoOntarioCanada
| | | | - Paul A. Peters
- Department of SociologyUniversity of New BrunswickFrederictonNew BrunswickCanada
| | - Paul A. Demers
- Occupational Cancer Research CentreCancer Care OntarioTorontoOntarioCanada
- Institute of Medical ScienceUniversity of TorontoTorontoOntarioCanada
- Dalla Lana School of Public HealthUniversity of TorontoTorontoOntarioCanada
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Sritharan J, Demers PA, Harris SA, Cole DC, Peters CE, Villeneuve PJ. Occupation and risk of prostate cancer in Canadian men: A case-control study across eight Canadian provinces. Cancer Epidemiol 2017; 48:96-103. [PMID: 28456092 DOI: 10.1016/j.canep.2017.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 04/02/2017] [Accepted: 04/10/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND The etiology of prostate cancer continues to be poorly understood, including the role of occupation. Past Canadian studies have not been able to thoroughly examine prostate cancer by occupation with detailed information on individual level factors. METHODS Occupation, industry and prostate cancer were examined using data from the National Enhanced Cancer Surveillance System, a large population-based case-control study conducted across eight Canadian provinces from 1994 to 1997. This analysis included 1737 incident cases and 1803 controls aged 50 to 79 years. Lifetime occupational histories were used to group individuals by occupation and industry employment. Odds ratios and 95% confidence intervals were calculated and adjustments were made for known and possible risk factors. RESULTS By occupation, elevated risks were observed in farming and farm management (OR=1.37, 95% CI 1.02-1.84), armed forces (OR=1.33, 95% CI 1.06-1.65) and legal work (OR=2.58, 95% CI 1.05-6.35). Elevated risks were also observed in office work (OR=1.20, 95% CI 1.00-1.43) and plumbing (OR=1.77, 95% CI 1.07-2.93) and with ≥10 years duration of employment. Decreased risks were observed in senior management (OR=0.65, 95% CI 0.46-0.91), construction management (OR=0.69, 95% CI 0.50-0.94) and travel work (OR=0.37, 95% CI 0.16-0.88). Industry results were similar to occupation results, except for an elevated risk in forestry/logging (OR=1.54, 95% CI 1.06-2.25) and a decreased risk in primary metal products (OR=0.70, 95% CI 0.51-0.96). CONCLUSION This study presents associations between occupation, industry and prostate cancer, while accounting for individual level factors. Further research is needed on potential job-specific exposures and screening behaviours.
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Affiliation(s)
- Jeavana Sritharan
- Occupational Cancer Research Centre, Cancer Care Ontario, Canada; Institute of Medical Science, University of Toronto, Canada.
| | - Paul A Demers
- Occupational Cancer Research Centre, Cancer Care Ontario, Canada; Institute of Medical Science, University of Toronto, Canada; Dalla Lana School of Public Health, University of Toronto, Canada
| | - Shelley A Harris
- Occupational Cancer Research Centre, Cancer Care Ontario, Canada; Dalla Lana School of Public Health, University of Toronto, Canada
| | - Donald C Cole
- Dalla Lana School of Public Health, University of Toronto, Canada
| | - Cheryl E Peters
- Department of Health Sciences, Carleton University, Canada; Institut Armand-Frappier, Institut National de la Recherche Scientifique, Canada; CHAIM Research Centre, Carleton University, Canada
| | | | - Paul J Villeneuve
- Occupational Cancer Research Centre, Cancer Care Ontario, Canada; CHAIM Research Centre, Carleton University, Canada
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Sridhar R, Bond V, Dunmore-Griffith J, Cousins VM, Zhang R, Millis RM. Relationship Between Aerobic Fitness, the Serum IGF-1 Profiles of Healthy Young Adult African American Males, and Growth of Prostate Cancer Cells. Am J Mens Health 2016; 11:92-98. [PMID: 25990510 DOI: 10.1177/1557988315587740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The growth of prostate tumors is mediated by the bioavailability of androgens and insulin-like growth factors. This study tested the hypothesis that healthy young adult African American men exhibiting low aerobic capacity (fitness) have serum insulin-like growth Factor-1 (IGF-1) and testosterone levels that promote growth of prostate cancer cells. A cross-sectional data research design was used to study groups of 18- to 26-year-old healthy men exhibiting low and moderate aerobic fitness, based on their peak oxygen consumption (VO2peak). The individual serum levels of IGF-1, IGF-1 binding protein-3 (IGFBP-3), and testosterone were measured. In vitro growth of androgen-dependent LNCaP prostate tumor cells was measured after incubation in culture medium fortified with each subject's serum. Aerobic capacity was significantly greater in the moderate-fitness group than in the low-fitness group without an intergroup difference in body mass index. The serum IGF-1 concentration was significantly higher in the low-fitness group in the absence of an intergroup difference in serum testosterone. The serum IGFBP-3 concentration was significantly lower in the low-fitness group. Prostate tumor cell growth was significantly greater in the cultures incubated in media containing the sera of the low-fitness group than in the sera of the moderate-fitness group. These findings suggest that moderate aerobic fitness in young adults may decrease the circulating levels of free IGF-1 and lower the potential to support growth of prostate cancer cells.
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Affiliation(s)
| | | | | | | | | | - Richard M Millis
- 2 The American University of Antigua College of Medicine, St. John's, Antigua & Barbuda
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Sritharan J, Demers PA, Harris SA, Cole DC, Kreiger N, Sass-Kortsak A, Lightfoot N. Natural resource-based industries and prostate cancer risk in Northeastern Ontario: a case-control study. Occup Environ Med 2016; 73:506-11. [PMID: 27245375 DOI: 10.1136/oemed-2016-103573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 05/11/2016] [Indexed: 01/31/2023]
Abstract
OBJECTIVE Prostate cancer continues to be the most commonly diagnosed cancer in men, and there is limited knowledge on its preventable risk factors. A number of occupational exposures in natural resource-based industries are suspected to be related to prostate cancer risk. This study investigates associations between employment in these industries and prostate cancer. METHODS Data were from a population-based, case-control study previously conducted in Northeastern Ontario. Incident cases (N=760) aged 45-85 years and diagnosed with prostate cancer between 1995 and 1998 were identified from the Ontario Cancer Registry. Controls (N=1632) were recruited using telephone listings, and were frequency matched to cases by age. Lifetime occupational history was collected for all participants. Logistic regression was used to estimate ORs and their associated 95% CIs. RESULTS Elevated risks were observed for employment in forestry and logging industries (OR=1.87, 95% CI 1.32 to 2.73) and occupations (OR=1.71, 95% CI 1.24 to 2.35), and these risks increased with duration of employment for ≥10 years. Elevated risks were also found for employment in wood products industries (OR=1.45, 95% CI 1.07 to 1.97), and paper and allied products industries (OR=1.43, 95% CI 1.03 to 2.00), and when duration of employment was ≥10 years. There were also elevated risks in agriculture and mining-related work; however, these findings were not consistent across industry and occupation categories. CONCLUSIONS Prostate cancer risk may be associated with work in several natural resource industries, primarily in the forest industries. To further evaluate observed associations, studies should focus on natural resource-based exposures in larger populations with improved exposure assessment.
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Affiliation(s)
- Jeavana Sritharan
- Institute of Medical Science, University of Toronto, Occupational Cancer Research Centre, Cancer Care Ontario, Toronto, Ontario, Canada
| | - Paul A Demers
- Occupational Cancer Research Centre, Cancer Care Ontario, University of Toronto, Toronto, Ontario, Canada
| | - Shelley A Harris
- Cancer Care Ontario, University of Toronto, Toronto, Ontario, Canada
| | | | | | | | - Nancy Lightfoot
- School of Rural and Northern Health, Laurentian University, Sudbury, Ontario, Canada
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Sharma M, Lawson JA, Kanthan R, Karunanayake C, Hagel L, Rennie D, Dosman JA, Pahwa P. Factors Associated With the Prevalence of Prostate Cancer in Rural Saskatchewan: The Saskatchewan Rural Health Study. J Rural Health 2015; 32:125-35. [PMID: 26265246 DOI: 10.1111/jrh.12137] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2015] [Indexed: 11/28/2022]
Abstract
PURPOSE Prostate cancer is the most commonly diagnosed cancer in Canadian males, and it is the third most common cause of cancer-related deaths in men. Some studies suggest that occupational exposure may be associated with prostate cancer. However, the etiology of prostate cancer is ambiguous. The purpose of this study was to assess the rural occupational exposure, including farming, as a determinant of prostate cancer in rural men. We investigated the prevalence of prostate cancer and its putative relationship between rural exposures in the Saskatchewan province of Canada. METHODS In 2010, a baseline mailed survey was conducted of 11,982 households located in 4 geographic regions (southwest, southeast, northwest, and northeast) of rural Saskatchewan, Canada. The questionnaires collected information on individual and contextual determinants from a rural population of men. In total 2,938 males older than 45 years were included in the logistic regression analysis. FINDINGS The age-standardized prevalence of prostate cancer was 3.32%. Farm residence was a significant risk factor associated with prevalence of prostate cancer while farming occupation and duration were not. Men who were exposed to insecticides and fungicides together (OR [95% CI] = 2.23 [1.15-4.33], P = .02) at work showed an increased potential risk compared to the nonexposed. The effect of farm/nonfarm residence on prevalence of prostate cancer differed depending on personal smoking history and family history of cancer. CONCLUSION Workplace exposure to insecticides and fungicides together were statistically significantly associated with prevalence of prostate cancer.
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Affiliation(s)
- Meenu Sharma
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Joshua A Lawson
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Rani Kanthan
- Saskatoon Health Region, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Chandima Karunanayake
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Louise Hagel
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Donna Rennie
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - James A Dosman
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Punam Pahwa
- Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.,Department of Community Health and Epidemiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Doolan GW, Benke G, Giles GG, Severi G, Kauppinen T. A case control study investigating the effects of levels of physical activity at work as a risk factor for prostate cancer. Environ Health 2014; 13:64. [PMID: 25103150 PMCID: PMC4237774 DOI: 10.1186/1476-069x-13-64] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 07/25/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND A potential risk factor for prostate cancer is occupational physical activity. The occupational aetiology of prostate cancer remains unclear. The purpose of this research was to examine associations between the level of exposure to various measures of physical activity at work and the risk of Prostate Cancer. METHODS Using the Finnish Job Exposure Matrix and the occupational history of 1,436 cases and 1,349 matched controls from an Australian case control study; we investigated five related exposure variables considered to be risk factors by comparing odds ratios. RESULTS Modestly increasing odds ratios were detected with increasing levels of workload but there was no difference in this trend between moderate and high grade tumours. In regard to occupational physical workload no statistically significant association was observed overall but an increasing trend with level of exposure was observed for high grade compared with moderate grade tumours. CONCLUSION Both workload and physical workload merit further investigation, particularly for the latter in relation to grade of tumour.
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Affiliation(s)
- Glenn W Doolan
- Department of Epidemiology & Preventive Medicine, Monash University, The Alfred Centre, The Alfred, Commercial Road, Melbourne, Victoria 3004, Australia
- Permanent Address: P.O. Box 276, Trafalgar, Victoria 3824, Australia
| | - Geza Benke
- Department of Epidemiology & Preventive Medicine, Monash University, The Alfred Centre, The Alfred, Commercial Road, Melbourne, Victoria 3004, Australia
| | - Graham G Giles
- Department of Epidemiology & Preventive Medicine, Monash University, The Alfred Centre, The Alfred, Commercial Road, Melbourne, Victoria 3004, Australia
- Cancer Epidemiology Centre, Cancer Council Victoria, 615 St. Kilda Road, Melbourne, Victoria 3004, Australia
- Centre for Genetic Epidemiology, University of Melbourne, 200 Berkeley Street, Carlton, Victoria 3053, Australia
| | - Gianluca Severi
- Cancer Epidemiology Centre, Cancer Council Victoria, 615 St. Kilda Road, Melbourne, Victoria 3004, Australia
- Centre for Genetic Epidemiology, University of Melbourne, 200 Berkeley Street, Carlton, Victoria 3053, Australia
| | - Timo Kauppinen
- Finnish Institute of Occupational Health, Topeliuksenkatu 41aA, FIN-00250 Helsinki, Finland
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12
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Jones MK, Harris MA, Peters PA, Tjepkema M, Demers PA. Prostate cancer and occupational exposure to whole-body vibration in a national population-based cohort study. Am J Ind Med 2014; 57:896-905. [PMID: 24965268 DOI: 10.1002/ajim.22354] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2014] [Indexed: 11/11/2022]
Abstract
BACKGROUND Following preliminary evidence from observational studies, we test the potential relationship between whole-body vibration (WBV) and prostate cancer in a cohort study. METHODS WBV exposure was assigned based on occupation in 1991 and 1,107,700 participants were followed for incident prostate cancer until the end of 2003. Adjusted hazard rate ratios (HRs) were calculated using Cox proportional hazards modeling. RESULTS 17,922 incident prostate cancer cases were observed. WBV-exposed men in Natural and Applied Sciences Occupations had a 37% elevated risk of prostate cancer (95% CI 1.09-1.72) and WBV-exposed men in Trades, Transport, and Equipment Operators Occupations had a 9% reduced risk (95% CI 0.86-0.97). Independent of WBV exposure, small but significant differences in risk were seen for several occupational categories. CONCLUSIONS We found no consistent relationship between WBV and prostate cancer. Further research could focus on other exposures or specific occupations in the studied categories to determine what may be contributing to the observed differences in prostate cancer risk.
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Affiliation(s)
- Marcella K. Jones
- Occupational Cancer Research Centre; Toronto Canada
- Dalla Lana School of Public Health; University of Toronto; Toronto Canada
| | - M. Anne Harris
- Occupational Cancer Research Centre; Toronto Canada
- School of Occupational and Public Health; Ryerson University; Toronto Canada
| | - Paul A. Peters
- Health Analysis Division; Statistics Canada; Ottawa Canada
| | | | - Paul A. Demers
- Occupational Cancer Research Centre; Toronto Canada
- Dalla Lana School of Public Health; University of Toronto; Toronto Canada
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Doolan G, Benke G, Giles G. An Update on Occupation and Prostate Cancer. Asian Pac J Cancer Prev 2014; 15:501-16. [DOI: 10.7314/apjcp.2014.15.2.501] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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14
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Nadalin V, Kreiger N, Parent ME, Salmoni A, Sass-Kortsak A, Siemiatycki J, Sloan M, Purdham J. Prostate cancer and occupational whole-body vibration exposure. ACTA ACUST UNITED AC 2012; 56:968-74. [PMID: 22539558 DOI: 10.1093/annhyg/mes010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Prostate cancer is common and its etiology largely unknown; therefore, it is important to explore all potential risk factors that are biologically plausible. Recent literature suggests a relationship between whole-body vibration (WBV) and prostate cancer risk. The aim of this study was to determine whether occupational WBV was a risk factor for prostate cancer. Existing data, collected on 447 incident cases and 532 population controls (or their proxies), in Montreal, Canada, were used to evaluate this question. Personal interviews collected detailed job descriptions for every job held, the tasks involved, and type of equipment used. For each job, experts assessed the intensity and daily duration of WBV exposure. Inter-rater agreement for WBV ratings was examined using the kappa statistic, with values that ranged from 0.83 to 0.94. Logistic regression models explored the relationship between WBV exposure and prostate cancer, using various combinations of intensity, daily duration, and years of exposure. Potential confounders were also examined. Occupations with WBV exposure demonstrated an increased statistically non-significant risk [odds ratio (OR) = 1.44, 95% confidence interval (CI): 0.99-2.09]. The risk for transport equipment operation, a job with WBV exposure, was significantly elevated (OR = 1.90, 95% CI: 1.07-3.39). These results, together with those of an earlier study, suggest that workers in heavy equipment and transport equipment operation may have increased risk of prostate cancer. Further investigation is warranted.
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Affiliation(s)
- Victoria Nadalin
- Research, Prevention and Cancer Control, Cancer Care Ontario, Toronto, Ontario, Canada.
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15
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Liu Y, Hu F, Li D, Wang F, Zhu L, Chen W, Ge J, An R, Zhao Y. Does physical activity reduce the risk of prostate cancer? A systematic review and meta-analysis. Eur Urol 2011; 60:1029-44. [PMID: 21802197 DOI: 10.1016/j.eururo.2011.07.007] [Citation(s) in RCA: 170] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2011] [Accepted: 07/04/2011] [Indexed: 12/16/2022]
Abstract
CONTEXT Numerous observational epidemiologic studies have evaluated the association between physical activity and prostate cancer (PCa); however, the existing results are inconsistent. OBJECTIVE To determine the association between physical activity and risk of PCa. EVIDENCE ACQUISITION A systematic search was performed using the Medline, Embase, and Web of Science databases through 15 May 2011 to identify all English-language articles that examined the effect of physical activity on the risk of PCa. This meta-analysis was conducted according to the guidelines for the meta-analysis of observational studies in epidemiology. EVIDENCE SYNTHESIS This meta-analysis consisted of 88,294 cases from 19 eligible cohort studies and 24 eligible case-control studies. When data from both types of studies were combined, total physical activity (TPA) was significantly associated with a decreased risk of PCa (pooled relative risk [RR]: 0.90; 95% confidence interval [CI], 0.84-0.95). The pooled RR for occupational physical activity (OPA) and recreational physical activity (RPA) were 0.81 (95% CI, 0.73-0.91) and 0.95 (95% CI, 0.89-1.00), respectively. Notably, for TPA, we observed a significant PCa risk reduction for individuals between 20 and 45 yr of age (RR: 0.93; 95% CI, 0.89-0.97) and between 45 and 65 yr of age (RR: 0.91; 95% CI, 0.86-0.97) who performed activities but not for individuals <20 yr of age or >65 yr of age. CONCLUSIONS There appears to be an inverse association between physical activity and PCa risk, albeit a small one. Given that increasing physical activity has numerous other health benefits, men should be encouraged to increase their physical activity in both occupational and recreational time to improve their overall health and potentially decrease their risk of PCa.
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Affiliation(s)
- YuPeng Liu
- Department of Epidemiology, School of Public Health, Harbin Medical University, Heilongjiang, People's Republic of China
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16
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Dombi G, Rosbolt J, Severson R. Neural network analysis of employment history as a risk factor for prostate cancer. Comput Biol Med 2010; 40:751-7. [DOI: 10.1016/j.compbiomed.2010.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Revised: 07/13/2010] [Accepted: 07/14/2010] [Indexed: 10/19/2022]
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17
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Young E, Kreiger N, Purdham J, Sass-Kortsak A. Prostate cancer and driving occupations: could whole body vibration play a role? Int Arch Occup Environ Health 2009; 82:551-6. [DOI: 10.1007/s00420-009-0403-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 01/21/2009] [Indexed: 10/21/2022]
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18
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Wiklund F, Lageros YT, Chang E, Bälter K, Johansson JE, Adami HO, Grönberg H. Lifetime total physical activity and prostate cancer risk: a population-based case–control study in Sweden. Eur J Epidemiol 2008; 23:739-46. [DOI: 10.1007/s10654-008-9294-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Accepted: 10/02/2008] [Indexed: 11/29/2022]
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