Review article
Non-dietary environmental risk factors in prostate cancer
Factores de riesgo ambientales no dietéticos en el cáncer de próstata
J. Ferrís-i-Tortajadaa,
, O. Berbel-Tornerob, J. Garcia-i-Castellc, J.A. López-Andreud, E. Sobrino-Najule, J.A. Ortega-Garcíaf
Corresponding author
a Unidad de Salud Medioambiental Pediátrica, Unidad de Oncología Pediátrica, Hospital Infantil Universitario La Fe, Valencia, Spain
b Centro de Salud de Chella, Chella, Valencia, Spain
c Sección de Anatomía Patológica, Hospital de Sagunt, Valencia, Spain
d Sección de Neumología Pediátrica, Hospital Infantil Universitario La Fe, Valencia, Spain
e Mount Sinai International Exchange Program, Department Medicine Preventive, Nueva York, United States
f Unidad de Salud Medioambiental Pediátrica, Hospital Materno-Infantil Universitario Virgen de la Arrixaca, Murcia, Spain
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"apellidos" => "Ortega-García" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">f</span>" "identificador" => "aff0030" ] ] ] ] "afiliaciones" => array:6 [ 0 => array:3 [ "entidad" => "Unidad de Salud Medioambiental Pediátrica, Unidad de Oncología Pediátrica, Hospital Infantil Universitario La Fe, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Centro de Salud de Chella, Chella, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Sección de Anatomía Patológica, Hospital de Sagunt, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Sección de Neumología Pediátrica, Hospital Infantil Universitario La Fe, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">d</span>" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Mount Sinai International Exchange Program, Department Medicine Preventive, Nueva York, United States" "etiqueta" => "<span class="elsevierStyleSup">e</span>" "identificador" => "aff0025" ] 5 => array:3 [ "entidad" => "Unidad de Salud Medioambiental Pediátrica, Hospital Materno-Infantil Universitario Virgen de la Arrixaca, Murcia, Spain" "etiqueta" => "<span class="elsevierStyleSup">f</span>" "identificador" => "aff0030" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Factores de riesgo ambientales no dietéticos en el cáncer de próstata" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">In Western countries prostate cancer is a major medical problem due to its high incidence and significant mortality.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> For these reasons, primary prevention reduces not only the considerable economic burden of diagnosis and treatment but it also the enormous emotional stress of patients and their family and social environment.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,2</span></a> To this end, we must progress in our current understanding of the risk factors involved in its etiopathogenesis.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">In this paper, we carry out an updated review of the main non-dietary environmental risk factors associated with prostate cancer, with varying degrees of scientific consistency, in accordance with our bibliographic research.</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Smoking</span><p id="par0015" class="elsevierStylePara elsevierViewall">Active and passive exposures to smoke from burning tobacco are considered a carcinogen for many human cancers.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> In spite of this, the process for establishing its causal association with prostate cancer has been slow. With respect to its incidence, most epidemiological studies<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4,5</span></a> have not established a causal relationship between tobacco and the disease. Case–control studies have not found a relationship between the various variables of smoking and the incidence of the disease. However, some cohort studies documented a 2–3 times higher risk in smokers of more than a pack a day compared with nonsmokers. However, these studies have not demonstrated a convincing dose–response relationship, neither have they evaluated the influence of possible dietary risk factors that are confusing.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Regarding mortality, the association has been more consistently documented.<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4–6</span></a> Several cohort studies have established a direct relationship between smoking and higher mortality due to prostate cancer. Smoking patients double the risk of dying from the disease compared to nonsmokers. Most authors found a gradual risk in relation to the number of cigarettes smoked daily and years one has been smoking. However, a convincing article documented a dose–response relationship between the number of packs per year of the smoker 10<span class="elsevierStyleHsp" style=""></span>years before diagnosis.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> Although in several studies ex-smokers did not seem to have a higher risk of dying from prostate cancer, one study documented adverse effects on mortality until a decade after cessation of smoking.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">A recently published meta-analysis provides convincing data and statistically significant causal association between exposure to tobacco smoke and the increased incidence and mortality of prostate cancer.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Analyzing 24 epidemiological cohort studies including 21,579 patients, it was found that when stratified by number of cigarettes smoked, current smokers had a higher risk of between 11% and 22% compared to those who had never smoked, and of 9% compared to ex-smokers; these differences were statistically significant. Mortality in active smokers showed statistically significant differences, with an increased risk of 14% compared to those who had never smoked, which increased to 24% and 30% for the most addicted. The authors commented that probably because of their lower case material, studies carried out previous underestimated the true influence of smoking on the incidence and mortality of prostate cancer. They also recommended the need to design studies to review prognosis variables (tumor stage and grade) and medical history of smoking, both in smokers and former smokers.</p><p id="par0030" class="elsevierStylePara elsevierViewall">The causal association with prostate cancer is biologically plausible because smoke carcinogens from tobacco act directly, causing DNA mutations, and indirectly, causing alterations in hormone metabolism. Some authors have found interactions between smoking and certain genetic polymorphisms associated with increased risk of prostate cancer.</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Prostatic infectious-inflammatory factors</span><p id="par0035" class="elsevierStylePara elsevierViewall">Substantial epidemiological, genetic, histological and molecular biology data shows the influence of prostate infection and consequent chronic inflammation in the pathogenesis and progression of prostate cancer.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,4,8</span></a> Potentially, infectious agents can influence carcinogenesis through the following mechanisms: (a) incorporation of viral oncogenes in the genome of the carrier, (b) inhibition of tumor suppressor genes, (c) stimulation of proliferative signals, and (d) by suppression of the immune surveillance system. Although chronic prostatitis caused by sexually transmitted diseases is associated with increased prostate cancer risk and poorer outcome in treatment, to date, no specific infectious agent has been convincingly associated as a causal agent of the disease.<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4,8</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Human papillomavirus (HPV) has received greater attention due to its association with genitourinary cancers, but its real contribution to prostate cancer is controversial. While some authors have found no association, others have implicated type 16, which corresponds to the variety most linked to anogenital cancers.<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Trichomonas vaginalis</span> infection causes adherence of the protozoan to epithelial cells by decreasing the expression of anti-apoptotic genes; it also alters the production of interleukin 6 and monocyte chemotaxis proteins. An extensive case–control study documented that HIV-positive persons had a statistically significant increase of 43% of prostate cancer (95% CI 1.00–2.03) and a 76% increase in high histological grade (95% CI 2.97–3.18).<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">A gammarretrovirus denominated XMRV has recently been identified in radical prostatectomy specimens. Its persistence in mesenchymal stromal cells adjacent to the neoplastic glands is associated with genetic polymorphism R426Q RNASEL. Possible etiopathogenic action would relate to signs and cell transduction pathways between the stroma and the epithelium. If it were ultimately categorized as an oncogenic virus, obtaining a specific vaccine would prevent the number of cases of prostate cancers associated with XMRV.<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Cadmium</span><p id="par0055" class="elsevierStylePara elsevierViewall">During the decades of the 70s and 80s in the twentieth century, some researchers provided evidence on the increased risk of prostate cancer among men occupationally exposed to cadmium (Cd). Subsequently, a review of the International Agency for Research on Cancer and a meta-analysis of 29 epidemiological studies documented a slight, not statistically significant increase in the incidence of prostate cancer associated with exposure to Cd.<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">12,13</span></a> Toxicologically, a higher tissular concentration of Cd has been found in prostate cancer compared with benign prostatic hypertrophy, with greater amounts in cancers of a higher histological grade. The potentially carcinogenic effect of Cd can be modified by zinc, since both have antagonistic effects on the prostate. Neoplastic tissue has a lower ratio of zinc/Cd than a normal prostate, suggesting that: (a) a high content of zinc in the prostate may protect against carcinogenesis, (b) Cd can act as a weak prostatic carcinogen and is enhanced by a zinc deficiency and, (c) the inability of the prostate to maintain appropriate zinc homeostasis may favor Cd-induced carcinogenesis.<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a></p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Herbicides</span><p id="par0060" class="elsevierStylePara elsevierViewall">These are active chemical compounds that are used to fight plant pests. Agent Orange is a mixture of two herbicides that were used as a defoliant between 1962 and 1971 in the Vietnam War. In 1998, the National Academy of Science of the USA recognized a positive association between herbicide exposure and many human cancers, but its association with prostate cancer was considered limited and not conclusive.<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> More recent studies suggest a more consistent association. In a review published in 2008, in which 6214 veterans of the Vietnam War were exposed to the herbicide and compared with 6930 non-exposed veterans, the authors found twice as many cases of prostate cancer among the exposed veterans (239 vs. 124), with earlier diagnostic ages, as well as an increased risk of presenting a Gleason score of 8–10 (21.8% vs. 10.5%) and greater likelihood of metastatic disease among exposed veterans (13.4% vs. 4%). Additionally, the authors found no differences between the groups with respect to age, smoking, body mass index, exposure to finasteride and PSA levels. In a multivariate logistic regression model, Agent Orange was the most predictive factor not only of developing prostate cancer but also of a higher histological grade and a greater probability of metastatic disease at diagnosis.<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Pesticides</span><p id="par0065" class="elsevierStylePara elsevierViewall">They are chemical compounds used to fight animal pests. The difficulties in interpreting the risks associated with prostate cancer lie in the existence of hundreds of different active principles, as well as in the direct chronic and multiple exposure to them in low doses, and particularly indirect exposure, through food, water, air and the environment.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Since the end of the 60s, ecological studies based on deaths showed mortality rates for some cancers, including prostate cancer, which were significantly higher in rural areas of North America, whereas the overall cancer mortality rates were lower in urban areas.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> In the decade of the 90s, three meta-analyses<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">17–19</span></a> documented increased risk, 7%, 8% and 12% respectively, both in the incidence and mortality of prostate cancer in rural areas with high agricultural activity in the U.S. compared with the general population in other areas. However, living in a rural area is not synonymous with the use of pesticides, as potentially, many risk factors related to lifestyle, exposures to other chemicals and biological contaminants are involved.</p><p id="par0075" class="elsevierStylePara elsevierViewall">In the last decade, three meta-analyses have analyzed the use of pesticides in the professional environment.<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20–22</span></a> One of them focused on both agricultural and nonagricultural pesticide users, except workers in production facilities.<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> Overall, they found a statistically significant and 13% higher risk in pesticide applicators (RR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.13, 95% CI 1.04–1.22). The second meta-analysis<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> focused on pesticide applicators and also found a statistically significant and 12% higher risk of prostate cancer (RR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.12, 95% CI 1.03–1.22). The third meta-analysis<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> focused on production facility workers and demonstrated a statistically significant and 28% higher risk of developing the disease (RR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.28, 95% CI 1.05–1.58). Moreover, after grouping pesticides by chemical group, they found consistent increases in all the groups, however without statistically significant differences.</p><p id="par0080" class="elsevierStylePara elsevierViewall">The <span class="elsevierStyleItalic">Agricultural Health Study</span><a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> conducted in the U.S. between 1993 and 2002, is one of the largest prospective cohort studies (89,658 people). It reported a 14% higher risk of prostate cancer among men who used pesticides, as well as three other significant associations between pesticide use and the risk of prostate cancer. On the one hand, a relationship was found between the application of methyl bromide, an alkylating agent classified as a potential occupational carcinogen by the National Institute for Occupational Safety and Health and the risk of prostate cancer, both in well-differentiated and poorly differentiated tumors. Moreover, a direct relationship was found with the use of organochlorine pesticides, including DDT and heptachlor, but only in those over aged 50<span class="elsevierStyleHsp" style=""></span>years. A statistically significant association was found with the use of various pesticides only men with a family history of prostate cancer. All this data suggest that exposure to certain pesticides must interact with genetic risk factors, and for several decades, in order to promote prostate carcinogenesis.</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Vasectomy</span><p id="par0085" class="elsevierStylePara elsevierViewall">Case–control and cohort studies that have analyzed the association between vasectomy and prostate cancer risk have produced conflicting results. Some authors found increased risks of 40%, 60% and 70% with vasectomy, but others found a lesser risk of developing prostate cancer among vasectomized men.<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4,24,25</span></a> In the latter, there is a greater risk among those who were vasectomized before the age of 20<span class="elsevierStyleHsp" style=""></span>years prior to the study and those who were vasectomized under the age of 35–40<span class="elsevierStyleHsp" style=""></span>years of age. A meta-analysis in this regard documents an OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.1 (95% CI 0.9–1.4) for cancer risk with vasectomy, but suggested increased risk among those with a positive family history and those who were operated at earlier ages.<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> On the other hand, in a very well designed study conducted in New Zealand, the country with the highest global prevalence of vasectomy, the authors found no relationship with these subgroups.<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Socioeconomic factors</span><p id="par0090" class="elsevierStylePara elsevierViewall">All social factors, including economic, lifestyle and educational and academic factors, do not, <span class="elsevierStyleItalic">per se</span>, seem to directly influence the risk of developing prostate cancer. Notwithstanding, they are indirectly involved by influencing dietary factors, occupational exposure and access to health systems, both for early detection and appropriate treatment, and they undoubtedly influence the incidence and mortality of this disease.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Sexual activity and marital status</span><p id="par0095" class="elsevierStylePara elsevierViewall">The influence of sexual activity and marital status in the development of prostate cancer has been studied extensively.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> Probably, their hypothetical relationship would be subject to the influence of inherent hormonal, infectious and cultural factors.</p><p id="par0100" class="elsevierStylePara elsevierViewall">Several studies have found increased risk of prostate cancer in men with multiple sexual partners and early commencement of sexual activity. However, other authors have documented a lower risk with high sexual activity and early commencement of it. Marital status is not associated with an increased mortality risk of the disease, but some authors have found increased risk among young married couples compared with older couples, as well as increased risk among married couples in comparison with single men.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Other occupational exposures</span><p id="par0105" class="elsevierStylePara elsevierViewall">A cohort study conducted on workers exposed to polychlorinated biphenyls (PCBs) showed a positive trend between incidence and mortality of prostate cancer, with dose and cumulative duration of exposure.<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> Another study that examined the levels of PCBs in adipose tissue revealed an association with prostate cancer (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>3.15, 95% CI 1.04–9.54), which was higher (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>30.3, 95% 3.24–284) among men with PSA levels<span class="elsevierStyleHsp" style=""></span>><span class="elsevierStyleHsp" style=""></span>16.5<span class="elsevierStyleHsp" style=""></span>ng/ml.<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a><span class="elsevierStyleItalic">The Netherlands Cohort Study</span><a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> revealed a slight increase of the disease in relation to exposure to metal fumes (RR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.11, 95% CI 0.80–1.54), which findings are similar to those obtained in a case–control study in Australia.<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> The association between exposure to mineral oils and the risk of the disease has also been analyzed. Increased risk has been reported after exposure exceeding 5<span class="elsevierStyleHsp" style=""></span>years, and was statistically significant in workers exposed from puberty.<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">In a case–control study focused on exposure to polycyclic aromatic hydrocarbons (PAHs), there was no evidence of any significant increase prostate cancer risk in relation to cumulative exposure to different occupational exposures, although the risk was high in exposure due to inhalation of PAHs in petroleum (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.12, 95% CI 0.73–1.73) or coal (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.29, 95% CI 0.73–2.30) and in skin exposure to coal (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.48, 95% CI 0.68–3.20).<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> However, in this study, an interaction was identified between genetic and environmental factors, showing that men over 60 who had the GSTP1 Val genetic polymorphism, who were exposed to high levels of PAHs, had a significantly higher risk (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>4.52, 95% CI 1.96–10.41). Evidence from other studies on exposure to PAHs and prostate cancer is less convincing.<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28,32</span></a></p><p id="par0115" class="elsevierStylePara elsevierViewall">Evidence on the risk associated with solvents is limited. A case–control study found a significant dose–response trend of prostate cancer among workers with low to moderate exposure (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.3 95% CI 0.8–2.1) and high levels of trichlorethylene (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>2.1).<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">Other authors that analyzed various occupations and occupational exposure in relation to the risk of prostate cancer found significant increases in firefighters (OR<span class="elsevierStyleHsp" style=""></span>=<span class="elsevierStyleHsp" style=""></span>1.22, 95% CI 1.12–1.33), oil workers and workers at semiconductor facilities/laboratories. A meta-analysis found increased risk among commercial pilots. Other studies have associated the risk of prostate cancer with paints, varnishes, soaps and perfumes, leather manufacture, exposure to electromagnetic fields, electricity workers, teachers, police and forestry workers, although other studies did not obtain the same results.<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> Some authors have analyzed the vibrations that the body experiences when certain jobs are performed and in relation to different modes of transport, but have not found a convincing association.<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Chemoprevention</span><p id="par0125" class="elsevierStylePara elsevierViewall">The administration of drugs to reduce the risk of prostate cancer is a subject of much study and great interest. Chemoprevention must be safe, maintain quality of life, decrease the incidence, impact and severity of the disease and be economically feasible. Of the drugs that have demonstrated greater scientific evidence in clinical trials, worth mention are inhibitors of the enzyme 5-α reductase, which converts testosterone into dihydrotestosterone and of which two isoforms exist, type 1 and type 2.</p><p id="par0130" class="elsevierStylePara elsevierViewall">In the <span class="elsevierStyleItalic">Prostate Cancer Prevention Trial (PCPT)</span>,<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> 18,882 men aged as of 55<span class="elsevierStyleHsp" style=""></span>years, with normal DRE and PSA equal to or less than 3<span class="elsevierStyleHsp" style=""></span>ng/ml, were assigned to receive finasteride for 7<span class="elsevierStyleHsp" style=""></span>years (5<span class="elsevierStyleHsp" style=""></span>mg/day), which inhibits 5-α reductase type 2, or placebo. Prostate cancer was detected in 803 of 4308 men in the finasteride group, compared with 1147 out of 4692 in the placebo group, thus showing a reduction in the risk of disease from 24.8% (95% CI 18.6–30.6, <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span><<span class="elsevierStyleHsp" style=""></span>0.001). Unexpectedly, there was an increase in the incidence of high-grade prostate cancer in the finasteride group compared with the placebo group (37% vs. 23.2; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span><<span class="elsevierStyleHsp" style=""></span>0.001), although later studies have not demonstrated that hormonal changes caused by finasteride enhance the development of aggressive disease.<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">In the <span class="elsevierStyleItalic">Reduction by Dutasteride of Prostate Cancer Events (REDUCE)</span>,<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a> 6729 men aged from 50 to 75<span class="elsevierStyleHsp" style=""></span>years, with serum PSA levels of 2.5–10<span class="elsevierStyleHsp" style=""></span>ng/ml, and prior negative biopsy, were assigned to receive dutasteride for 4<span class="elsevierStyleHsp" style=""></span>years (0.5<span class="elsevierStyleHsp" style=""></span>mg/day) or placebo. The findings, published in 2010, show that dutasteride (0.5<span class="elsevierStyleHsp" style=""></span>mg/day) reduced the risk of prostate cancer risk in a risk population by 22.8% (95% CI 15.2–29.8, <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span><<span class="elsevierStyleHsp" style=""></span>0.001) compared with placebo. Dutasteride is a powerful inhibitor of 5-α reductase and is 45 times stronger than finasteride in inhibiting type 1 isoform and twice as strong on isoform 2. No doubt that this is a promising drug in the prevention of prostate cancer on the risk population.</p><p id="par0140" class="elsevierStylePara elsevierViewall">Based on models that show that estrogens have synergy with androgens to induce prostatic hyperplasia, dysplasia and cancer, the role of the modulators of these receptors has been investigated. Toremifene, a selective modulator of estrogen receptors, is being evaluated at doses of 20<span class="elsevierStyleHsp" style=""></span>mg in a multicenter randomized double-blind, placebo-controlled study in men with high grade intraepithelial neoplasia, to assess the reduction in the incidence of prostate cancer at 12<span class="elsevierStyleHsp" style=""></span>months after initiation of the study (9.1 vs. 17.4%; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span><<span class="elsevierStyleHsp" style=""></span>0.05).<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Initial studies with statins (inhibitors of the enzyme 3-hydroxy-3-methylglutaryl coenzyme A) suggested a reduction in the risk of prostate cancer; however, different subsequent meta-analyses did not find this reduction.<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> Better-designed studies are required to assess the true effect of these agents. Likewise, trials carried out with inhibitors of cyclooxygenase (COX-2) have not documented an actual reduction in risk.<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> COX-2 enzyme is involved in inflammatory processes; it promotes angiogenesis and modulates apoptosis. The significant side effects of these drugs at cardiac and cerebrovascular levels make it unlikely that further studies be carried out with these agents. Other studies performed with supplements with selenium and vitamin E (SELECT study), vitamin C or folic acid, compared with placebo showed no significant reduction in the risk of the disease.<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a></p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Electromagnetic radiation</span><p id="par0150" class="elsevierStylePara elsevierViewall">Although it presented greater relative risks than expected in unexposed controls, the association between ionizing radiation and prostate cancer, there were no statistically significant increases.<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a></p><p id="par0155" class="elsevierStylePara elsevierViewall">Exposure to solar UV radiation is inversely associated with both the incidence and mortality of prostate cancer. The biological explanation of this fact is based on the synthesis and physiological actions of vitamin D.<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">39,40</span></a></p></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Final comments</span><p id="par0160" class="elsevierStylePara elsevierViewall">Prostate cancer represents the ideal prototype of the slow process of carcinogenesis and the necessary coexistence of constitutional risk factors with environmental risk factors for developing the disease environment. The fact that multiple factors are necessary means that when we analyze a single factor, most of the times we obtain contradictory results or increased risk without statistical significance. We see the most tangible example in exposure to tobacco smoke, given that numerous studies published with disparate results would need a meta-analysis to be performed using extensive patient case material to be able to convincingly determine its causal role. The same occurs with occupational exposure to pesticides, which, in order to obtain statistically significant data, has required large case studies. Even then, its association has only been able to be documented in men aged over 50<span class="elsevierStyleHsp" style=""></span>years with a family history of prostate cancer. Finally, we would like to point out the promising results that are being obtained with chemoprevention and which heralds its future administration to healthy population subgroups as primary prevention, and to prostrate cancer patients for tertiary prevention.</p></span></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Conflict of interest</span><p id="par0165" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflict of interest.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:9 [ 0 => array:2 [ "identificador" => "xres98357" "titulo" => array:5 [ 0 => "Abstract" 1 => "Introduction" 2 => "Materials and methods" 3 => "Results" 4 => "Conclusions" ] ] 1 => array:2 [ "identificador" => "xpalclavsec85517" "titulo" => "Keywords" ] 2 => array:2 [ "identificador" => "xres98358" "titulo" => array:5 [ 0 => "Resumen" 1 => "Introducción" 2 => "Material y método" 3 => "Resultados" 4 => "Conclusiones" ] ] 3 => array:2 [ "identificador" => "xpalclavsec85518" "titulo" => "Palabras clave" ] 4 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 5 => array:3 [ "identificador" => "sec0010" "titulo" => "Smoking" "secciones" => array:11 [ 0 => array:2 [ "identificador" => "sec0015" "titulo" => "Prostatic infectious-inflammatory factors" ] 1 => array:2 [ "identificador" => "sec0020" "titulo" => "Cadmium" ] 2 => array:2 [ "identificador" => "sec0025" "titulo" => "Herbicides" ] 3 => array:2 [ "identificador" => "sec0030" "titulo" => "Pesticides" ] 4 => array:2 [ "identificador" => "sec0035" "titulo" => "Vasectomy" ] 5 => array:2 [ "identificador" => "sec0040" "titulo" => "Socioeconomic factors" ] 6 => array:2 [ "identificador" => "sec0045" "titulo" => "Sexual activity and marital status" ] 7 => array:2 [ "identificador" => "sec0050" "titulo" => "Other occupational exposures" ] 8 => array:2 [ "identificador" => "sec0055" "titulo" => "Chemoprevention" ] 9 => array:2 [ "identificador" => "sec0060" "titulo" => "Electromagnetic radiation" ] 10 => array:2 [ "identificador" => "sec0065" "titulo" => "Final comments" ] ] ] 6 => array:2 [ "identificador" => "sec0070" "titulo" => "Conflict of interest" ] 7 => array:2 [ "identificador" => "xack35337" "titulo" => "Acknowledgements" ] 8 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2010-12-21" "fechaAceptado" => "2010-12-21" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec85517" "palabras" => array:6 [ 0 => "Prostate cancer" 1 => "Environmental risk factors" 2 => "Primary prevention" 3 => "Epidemiology" 4 => "Smoking" 5 => "Pesticides" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec85518" "palabras" => array:6 [ 0 => "Cáncer de próstata" 1 => "Factores de riesgo ambientales" 2 => "Prevención primaria" 3 => "Epidemiología" 4 => "Tabaquismo" 5 => "Pesticidas" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "<span class="elsevierStyleSectionTitle">Introduction</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">The aim is to update and disclose the main environmental risk factors, excluding dietary factors, involved in the etiopathology of prostate cancer.</p> <span class="elsevierStyleSectionTitle">Materials and methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Bibliographic review of the last 25<span class="elsevierStyleHsp" style=""></span>years of non-dietary environmental risk factors associated with prostate cancer between 1985 and 2010, obtained from <span class="elsevierStyleItalic">MedLine</span>, <span class="elsevierStyleItalic">CancerLit</span>, <span class="elsevierStyleItalic">Science Citation Index</span> and <span class="elsevierStyleItalic">Embase</span>. The search profiles were <span class="elsevierStyleItalic">Environmental Risk Factors/Tobacco/Infectious-Inflammatory Factors/Pesticides/Vasectomy/Occupational Exposures/Chemoprevention Agents/Radiation and Prostate Cancer</span>.</p> <span class="elsevierStyleSectionTitle">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">While some non-dietary environmental risk factors increase the risk of acquiring the disease, others decrease it. Of the former, it is worth mentioning exposal to tobacco smoke, chronic infectious-inflammatory prostatic processes and occupational exposure to cadmium, herbicides and pesticides. The first factors that reduce the risk are the use of chemopreventive drugs (Finasterida, Dutasteride) and exposure to ultraviolet solar radiation. With the current data, a vasectomy does not influence the risk of developing the disease.</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">The slow process of prostate carcinogenesis is the final result of the interaction of constitutional risk and environmental factors. Non-dietary environmental factors play an important role in the etiopathology of this disease. To appropriately assess the risk factors, extensive case studies that include all the possible variables must be analyzed.</p>" ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "<span class="elsevierStyleSectionTitle">Introducción</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Se pretende actualizar y divulgar los principales factores de riesgo ambientales, excluyendo los dietéticos, implicados en la etiopatogenia del cáncer de próstata.</p> <span class="elsevierStyleSectionTitle">Material y método</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Revisión bibliográfica de los últimos 25 años de los factores de riesgo ambientales no dietéticos asociados a cáncer de próstata entre 1985 y 2010, obtenida del <span class="elsevierStyleItalic">MedLine, CancerLit, Science Citation Index</span> y <span class="elsevierStyleItalic">Embase</span>. Los perfiles de búsqueda han sido <span class="elsevierStyleItalic">Environmental Risk Factors/Tobacco/Infectious-Inlammation Factors/Pesticides/Vasectomy/Occupational Exposures/Chemoprevention Agents/Radiation y</span> «Cáncer de Próstata».</p> <span class="elsevierStyleSectionTitle">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Mientras que algunos factores de riesgo ambientales no dietéticos incrementan el riesgo de padecer la enfermedad, otros lo disminuyen. Entre los primeros destacan la exposición al humo del tabaco; los procesos prostáticos infecto-inflamatorios crónicos y la exposición profesional al cadmio, herbicidas y pesticidas. Los principales factores que reducen el riesgo es el empleo de fármacos quimiopreventivos (finasterida, dutasterida) y la exposición a la radiación ultravioleta solar. La vasectomía, con los datos actuales, no influye en el riesgo de desarrollar la enfermedad.</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">El lento proceso de carcinogénesis prostática es el resultado final de la interacción de factores de riesgo constitucionales y ambientales. Los factores ambientales no dietéticos desempeñan un papel importante en la etiopatogenia de esta enfermedad. Para valorar apropiadamente los factores de riesgo deben analizarse grandes casuísticas que incluyan todas las variables posibles.</p>" ] ] "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara">Please cite this article as: Ferrís-i-Tortajada, et al. Factores de riesgo ambientales no dietéticos en el cáncer de próstata. 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| Year/Month | Html | Total | |
|---|---|---|---|
| 2023 March | 1 | 0 | 1 |
| 2020 May | 1 | 2 | 3 |
| 2018 February | 6 | 0 | 6 |
| 2018 January | 5 | 1 | 6 |
| 2017 December | 7 | 0 | 7 |
| 2017 November | 6 | 0 | 6 |
| 2017 October | 11 | 2 | 13 |
| 2017 September | 16 | 0 | 16 |
| 2017 August | 13 | 2 | 15 |
| 2017 July | 19 | 2 | 21 |
| 2017 June | 8 | 2 | 10 |
| 2017 May | 11 | 1 | 12 |
| 2017 April | 12 | 2 | 14 |
| 2017 March | 13 | 3 | 16 |
| 2017 February | 10 | 4 | 14 |
| 2017 January | 11 | 0 | 11 |
| 2016 December | 20 | 6 | 26 |
| 2016 November | 24 | 7 | 31 |
| 2016 October | 40 | 6 | 46 |
| 2016 September | 15 | 4 | 19 |
| 2016 August | 19 | 5 | 24 |
| 2016 July | 16 | 3 | 19 |
| 2016 June | 14 | 8 | 22 |
| 2016 May | 33 | 14 | 47 |
| 2016 April | 32 | 8 | 40 |
| 2016 March | 21 | 8 | 29 |
| 2016 February | 22 | 14 | 36 |
| 2016 January | 23 | 9 | 32 |
| 2015 December | 17 | 12 | 29 |
| 2015 November | 14 | 11 | 25 |
| 2015 October | 19 | 8 | 27 |
| 2015 September | 11 | 3 | 14 |
| 2015 August | 14 | 8 | 22 |
| 2015 July | 5 | 2 | 7 |
| 2015 June | 6 | 1 | 7 |
| 2015 May | 16 | 2 | 18 |
| 2015 April | 21 | 5 | 26 |
| 2015 March | 19 | 4 | 23 |
| 2015 February | 17 | 4 | 21 |
| 2015 January | 28 | 4 | 32 |
| 2014 December | 39 | 6 | 45 |
| 2014 November | 27 | 5 | 32 |
| 2014 October | 35 | 9 | 44 |
| 2014 September | 41 | 9 | 50 |
| 2014 August | 22 | 4 | 26 |
| 2014 July | 49 | 6 | 55 |
| 2014 June | 11 | 6 | 17 |
| 2014 May | 15 | 5 | 20 |
| 2014 April | 15 | 3 | 18 |
| 2014 March | 26 | 6 | 32 |
| 2014 February | 18 | 4 | 22 |
| 2014 January | 7 | 3 | 10 |
| 2013 December | 19 | 2 | 21 |
| 2013 November | 16 | 0 | 16 |
| 2013 October | 24 | 8 | 32 |
| 2013 September | 19 | 4 | 23 |
| 2013 August | 13 | 3 | 16 |
| 2013 July | 5 | 1 | 6 |
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