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Article

Metabolic Syndrome and Physical Inactivity May Be Shared Etiological Agents of Prostate Cancer and Coronary Heart Diseases

by
Antonio Cicione
1,†,
Aldo Brassetti
2,*,†,
Riccardo Lombardo
1,
Antonio Franco
1,
Beatrice Turchi
1,
Simone D’Annunzio
1,
Antonio Nacchia
1,
Andrea Tubaro
1,
Giuseppe Simone
2 and
Cosimo De Nunzio
1
1
Department of Urology, Sant’Andrea Hospital, Via di Grottarossa 1035, 00189 Rome, Italy
2
Department of Urology, IRCCS “Regina Elena” National Cancer Institute, Via Elio Chianesi 53, 00144 Rome, Italy
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Cancers 2022, 14(4), 936; https://doi.org/10.3390/cancers14040936
Submission received: 10 December 2021 / Revised: 4 February 2022 / Accepted: 10 February 2022 / Published: 14 February 2022
(This article belongs to the Special Issue Physical Activity and Cancer Care)
Versions Notes

Abstract

:

Simple Summary

As metabolic syndrome (MetS) and a sedentary lifestyle are associated with an increased risk of prostate cancer (PCa) and cardiovascular diseases (CVDs), the 2 conditions may share common causes. We investigated the association between CVDs and PCa. Clinical data from patients undergone prostate biopsy were collected, physical activity (PA) was assessed and coronary heart diseases (CHDs) recorded. PCa was diagnosed in 395/955 men and 238 were aggressive tumors. Although CHDs were more common among PCa-patients (9.4% vs. 7.5%) the difference was not statistically significant and no difference was observed between low- and high-grade subgroups (9.5% vs. 9.2%). PA significantly reduced the risk of PCa diagnosis and aggressiveness while MetS only increased the risk of being diagnosed with cancer. CHDs were associated neither with tumor diagnosis nor aggressiveness. MetS and PA are strong predictors of PCa. We failed to prove a significant association between PCa and CHDs.

Abstract

As metabolic syndrome (MetS) and a sedentary lifestyle have been associated with an increased risk of developing both prostate cancer (PCa) and cardiovascular diseases (CVDs), the 2 conditions may share a common etiology. We aimed at investigating the association between CVDs and PCa. A retrospective analysis was performed. Our dataset on patients undergone systematic prostate biopsy was searched for histopathologic and clinical data. The physical activity (PA) scale for the elderly (PASE) was collected. Coronary heart diseases (CHDs) were recorded. Prognostic Grade Group ≥3 tumors were defined as high-grade (HG). The association between MetS, PA, CHDs and PCa was assessed using logistic regression analyses. Data on 955 patients were collected; 209 (22%) presented with MetS, 79 (8%) with CHDs. PCa was diagnosed in 395 (41.3%) men and 60% (n = 238) presented with an high-grade tumor. CHDs were more common among PCa-patients (9.4% vs. 7.5%; p = 0.302) but the difference was not statistically significant. No difference was observed between low- and high-grade subgroups (9.5% vs. 9.2%; p = 0.874). PASE independently predicted PCa diagnosis (OR: 0.287; p = 0.001) and HG-PCa (OR: 0.165; p = 0.001). MetS was an independent predictor of HG-PCa only (OR: 1.50; 95% CI: 1.100–2.560; p = 0.023). CHDs were not associated with tumor diagnosis and aggressiveness.

1. Introduction

Cardiovascular (CV) diseases (CVDs) represent a major cause of morbidity and mortality worldwide, with a lifetime risk exceeding 60%. More than 2200 Americans die of CVDs daily, one every 40 s [1]. Epidemiological projections are not reassuring as it has been estimated that CVDs incidence will escalate by 10% between 2010 and 2030 due to increasing rates of obesity, hypertension and diabetes [2]. These diseases of affluence, which are strongly related to a sedentary lifestyle, are key-components of metabolic syndrome (MetS) [3], a pro-inflammatory systemic condition which increases by two folds the risk of CVDs and related mortality [4].
Interestingly, Syndrome X and physical inactivity are also associated with prostatic diseases [5]. Men with metabolic issues, in fact, are thought to have alterations in vascular supply and innervation of several tissues, including bladder and prostate, which may cause lower urinary tract symptoms (LUTS) [3]. Similarly, metaflammation that characterizes sedentary MetS-patients may generate a pro-proliferative micro-tissue environment potentially leading to prostate cancer (PCa) [6], which in turn is the second leading cause of cancer death in men in the United States [7] and whose prevalence is significantly higher in this specific population [8].
In light of this, considering that a recent systematic review affirmed that patients with LUTS are at increased risk of coronary heart diseases (CHDs) [3] we hypothesized that these CV events could also be associated with PCa, and metabolic disorders may play a role in a shared etiologic mechanism. The present study aimed at investigating the possible association between CHDs and PCa diagnosis and aggressiveness and the role of MetS and physical activity (PA) in this pathogenetic pathway.

2. Materials and Methods

2.1. Patients and Dataset

After institutional review board approval, a retrospective analysis of our prospectively maintained database was performed. Data of 1332 patients undergone systematic prostate biopsy from January 2012 to September 2017 for elevated prostate specific antigen (PSA) values (≥4 ng/mL) and/or a suspected digital rectal examination (DRE) were selected for the analysis. Men that received more than one biopsy within the study timeframe and those with a history of previous prostate surgery were excluded.
Age and anthropometric parameters were assessed according to standardized methods and recorded from all patients. Waist circumference was measured, using a standard measurement strip with the patients standing and breathing normally, at the midway between the lowest rib margin and iliac crest [9]. BMI was calculated as weight in kilograms divided by height in meters, squared (kg/m2). Obesity was defined as BMI ≥ 30 kg/m2. Resting blood pressure was recorded as the first and fifth Korotkof sounds by auscultation methods [10]. Fasting (8 h) blood samples were drawn from all patients during the preoperative assessment evaluation and analyzed for blood glucose, HDL cholesterol, triglycerides, total Prostate Specific Antigen (PSA) [11]. The average daily energy expenditure was estimated for each patient, and these data were also included in the purpose-built dataset. The assessment was performed at the time of prostate biopsy, through the administration of the Physical Activity Scale for the Elderly (PASE), a questionnaire that measures frequency and duration of self-reported physical activity in the adults, and is comprised of items regarding occupational, household and leisure activities [8,12].
The presence of metabolic syndrome (MetS) was defined according to Adult Treatment Panel III (ATPIII) criteria [13]. Within 15 days before prostate biopsy, all patients were requested to undergo a resting electrocardiogram to rule out hidden heart diseases. These data, together with a personal history of Q-waves, myocardial infarctions or coronary disease requiring heart revascularizations (by means of bypass graft surgery or percutaneous transluminal angioplasty) were used to diagnose or confirm the presence of CHDs [3,14]. International Society of Urological Pathology (ISUP) Prognostic Grade Group (PGG) ≥3 tumors were defined as high-grade prostate cancers (HG-PCa) [15].

2.2. Statistical Analysis

Frequencies and proportions were used to report categorical variables that were compared by means of the Chi-squared test. Continuous variables were presented as median and interquartile ranges (IQRs) and were compared using either the Mann Whitney U test or Kruskal Wallis one-way based on their normal or not-normal distribution, respectively (normality of the distribution of variables was tested by the Kolmogorov Smirnov test). Predictors of PCa diagnosis and high grade disease were identified by means of univariable and multivariable logistic regression models (inclusion method): odds ratios and 95% confidence intervals were reported. An alpha value of 5% was considered as threshold for significance. Statistical analysis was performed using Statistical Package for Social Science 24.0 software (SPSS Inc., Chicago, IL, USA).

3. Results

Overall, 377 men were excluded from the analysis: 220/1332 (16%) because of multiple biopsies, 75/1332 (6%) for a personal history of prostate surgery and 82 (6%) for missing variables. Consequently, we included data on 955 consecutive patients, with a median age of 65 (IQR: 60–75) years and BMI of 26 (IQR: 21.4–30.2) kg/m2 (Table 1). Diabetes and hypertension were observed in 89 (9.4%) and 500 (52.3%) men, respectively; 209 (21.8%) were diagnosed with MetS. Overall, 79 (8.2%) patients reported a CHD in their medical history: 16 Q-waves, 30 myocardial infarction, 33 heart revascularization (Table 1). PCa was diagnosed in 395 (41.3%) men and 60% of these (n = 238) presented with an high-grade tumor. No statistically significant difference in terms of CHDs rate was observed between patients with or without PCa (9.4% vs. 7.5%; p = 0.302) (Table 1); the observed rate was comparable also in low- and high-grade subgroups (9.5% vs. 9.2%; p = 0.874).
At multivariable analysis, age (OR: 1.03; 95% CI: 1.012–1.055; p = 0.012), prostate volume (PV) (OR: 0.97; 95% CI: 0.966–0.980; p = 0.001), PSA at diagnosis (OR: 1.10; 95% CI: 1.063–1.142; p = 0.001) and PASE score (OR: 0.28; 95% CI: 0.124–0.668; p = 0.001) were independent predictors of PCa diagnosis (Table 2). These variables independently predicted HG-PCa too, together with MetS (OR: 1.50; 95% CI: 1.100–2.560; p = 0.023) (Table 3). A personal history of CHDs was associated neither with PCa diagnosis nor with high grade disease (Table 2 and Table 3).

4. Discussion

CVDs and PCa are two of the most urgent health challenges of this century, in Western Countries, and their prevalence is bound to increase [2] because of the so-called Metabolic syndrome pandemic [16], which in turn is a consequence of population ageing and sedentary lifestyle [17].
The systemic inflammatory status that characterizes MetS-patients may be a shared etiological agent of these diseases [4,18,19] and a recent meta-analysis showed an association between inflammatory markers and the risk of PCa [20]. Most authors advocate that chronic prostatic inflammation may induce carcinogenesis through several mechanisms including direct cellular and genomic damage, local immunosuppression and creation a pro-proliferative micro-tissue environment [21,22]. In a recent review, Silveira Rossi et al. reported that diabetes mellitus, hypertension and obesity are responsible for a chronic low-grade systemic inflammatory state which in turn is directly related to atherosclerosis and CVDs incidence [6]. This metaflammation causes the surge of reactive oxygen species which result in post-translational alterations of proteins, lipids and DNA [6]. Chronically inflamed adipocytes play a key role in this pathologic process by secreting pro-inflammatory cytokines, such as interleukin-1β, -6, and tumor necrosis factor-α which are relevant for the pathogenesis of certain neoplasms (colorectal cancers among others) [23].
Our previous findings and a recent meta-analysis (which included 24 studies and 132,589 participants) concluded that MetS is associated with an increased risk of HG cancers at prostate biopsy, adverse features at final pathology, disease recurrence and cancer-specific mortality [11,18,24,25,26]. Results from the present study confirmed that MetS only increased the risk of HG-PCa (OR: 1.50; 95%CI: 1.100–2.560; p = 0.023) (Table 2 and Table 3). One third of men with elevated PSA levels present at least with one of MetS components [27]. Individuals with hypertension show a higher risk of being diagnosed with PCa [28] and the use of calcium-channel-blockers has been associated with an increased incidence of this tumor [29]: it is hypothesized that these drugs promote carcinogenesis by affecting the normal function of Cav3.1 channels which contribute to tumor repression and apoptosis promotion [29]. Advanced glycosylation end products, whose levels are particularly high in diabetic patients, are known to be responsible for cellular dysfunction [6]. Unexpectedly, however, diabetes seems inversely associated with the risk of PCa [30]. Though, men with type 2 diabetes typically present with low PSA levels, which might result in cancer underdiagnosis [31] as supported by the REDUCE trial (where participants were required to undergo biopsy regardless of PSA values) which failed to show an association between diabetes and PCa risk [32]. Conflicting results were reported concerning the impact of obesity on PCa risk. Giovannucci et al. found BMI positively associated with high-risk tumors and postulated that this could be due to the compromised balance between serum concentration of estrogen, testosterone, insulin and insulin-like growth factor-1, which is affected by adipose tissue [33]. Similarly, a meta-analysis of 17 cohort studies, demonstrated that obesity was associated with an increased risk of aggressive PCa and cancer-specific mortality [34]. Conversely, recent reviews failed to detect an association between visceral obesity and PCa development [35]. In particular, few case-control studies highlighted that a higher BMI is associated with a reduced risk of PSA-detected PCa [36,37]. Again, these observations might in part be explained by underdiagnosis as a 5 kg/m2 increase in BMI was associated with a 6% reduction in PSA levels [38], as per obesity-related plasma hemodiluition [39].
While the protective role of PA on the risk of CVDs is already supported by grounded evidences, its possible association with PCa prevention has been assessed only recently, and conflicting results were reported [40,41]. It has been postulated that exercise is capable of increasing telomere length and modulating gene expression responsible for protein intracellular transportation, metabolism and phosphorylation [42]. PA could also improve insulin-resistance and interfere with the levels of various circulating tumor-promoting proteins such as insulin-like growth factor-1 [43]. Finally, intensive training reduces adiposity, thus decreasing levels of blood levels of proinflammatory adipokines [44]. We already showed that an active lifestyle reduces the risk of cancer diagnosis and high-grade tumor at biopsy [12] and even reclassification during active surveillance [45]. Other authors showed that increasing levels are associated with a reduced risk for tumor recurrence and disease-specific death after primary treatment [46]. A recent systematic review by the European Association of Urology Section of Oncological Urology even concluded that regular physical activity reduces the risk of local and systemic disease progression, cancer-specific and overall mortality [47]. For these reasons, exercise has been included in the ASCO (American Society of Clinical Oncology) Clinical Practice Guidelines on PCa. Results from the present study confirmed our previous findings as PA significantly reduced the risk of PCa diagnosis and aggressiveness (Table 2 and Table 3).
Being both highly prevalent in Western Countries and considering their association with a sedentary lifestyle and the diseases of affluence, CVDs and PCa may have a common pathophysiological pathway, but this hypothesis has been scarcely investigated. According to a recent post-hoc analysis from the RADICAL PC study, two thirds of men with PCa were at high CV risk [48]. Correspondingly, another post-hoc analysis from the REDUCE trial highlighted that patients with a medical history of CHD show a 35% increased risk of being diagnosed with PCa (OR = 1.35, 95% CI: 1.08–1.67, p = 0.007) [49]. Similarly, we previously reported that patients with a moderate/high CV risk present an increased risk of HG-PCa (OR: 2.154, 95% CI: 1.076–4.314; p = 0.030) [50]. Results from the present study are in contrast with these observations. Actually, in the present study we chose to assess the association between PCa and CHDs. In fact, Q-waves, myocardial infarction and coronary disease requiring heart revascularization are three different clinical manifestations of the same pathophysiologic process that leads to CVDs [3]. Only 8.2% of our sample had a history of CHD while higher rates were reported in other series investigating the association between CHD and LUTS [18]. Although these cardiovascular events were more common among PCa-patients compared to controls (9.4% vs. 7.5%; p = 0.302) the difference did not reach statistical significance; the same occurred in high-grade and low-grade subgroups (9.5% vs. 9.2%; p = 0.874). At multivariate analysis, therefore, CHDs were not independent predictors of PCa diagnosis and high-grade tumor at biopsy.
Recently, the possible association between CHDs and PCa-medications has been extensively investigated, based on the assumption that men who have undergone bilateral orchiectomy are at increased risk of CVDs [51]. However, the influence of gonadotropin-releasing-hormone (GnRH) analogs on CV toxicity remain controversial. Several studies provided evidence that their use significantly increases the risk of myocardial infarction and stroke [52,53] while results from randomized clinical trials reported no differences [54,55]. Also a recent meta-analysis found no added risk of CV mortality in patients taking GnRH agonist vs. controls (RR = 0.93, p = 0.041) [56].
This study suffers from limitations inherent to its retrospective design. Regarding this, several detailed sociodemographic data which could affect the risk of CHDs (such as marital status, education and work experience) were not recorded on patients files and could not be extracted. Also the smoking status was not available in most of medical charts, thus it was not considered among the possible variables affecting the risk of PCa and CVDs. Another possible limitation of the present study is the use of the Physical Activity Scale for the Elderly to measure the average daily energy expenditure: this tool, in fact, was initially conceived for patients older that 65 years while a quarter of our study population is younger that 60 years. This questionnaire, however, is not only indicated for retired men as it investigate occupational, household and leisure activities. In fact, it was already successfully administered to cohorts of patients of the same age [8,12,45,57] or even younger [58,59]. Moreover, although a pro-inflammatory systemic condition is thought to be the shared etiological agent of CVDs and PCa, extent and degree of prostatic inflammation were not routinely assessed at the time of prostate biopsy. Study design with a convenience sample makes causal inferences difficult; borderline p-values should be interpreted with caution, with careful attention to both internal consistency and biological plausibility; and that residual confounding due to unknown or incompletely measured factors cannot be excluded.
To the best of our knowledge, ours is the first study investigating the association between CHDs and PCa incidence and aggressiveness. With this regard, one strength of our research is that possible hidden heart diseases were ruled out requiring every patient to undergo an electrocardiogram just before prostate biopsy, so that the identification of patients with heart disease was not only based on self-reported medical history, as previously done by other authors [14].

5. Conclusions

We confirmed that patients with MetS have an increased risk of being diagnosed with HG-PCa, compared to controls. Also the protective role of PA was affirmed, as higher PASE scores were associated with a reduced risk of cancer diagnosis and aggressiveness. Although CHDs are significantly more common among PCa-patients, regardless tumor grade, we failed to prove the predictive value of these cardiovascular events on cancer diagnosis.

Author Contributions

Conceptualization, C.D.N. and A.C.; methodology, C.D.N.; formal analysis, A.C. and R.L.; investigation, R.L., A.F., B.T., S.D. and A.N.; data curation, C.D.N., R.L., A.F., B.T., S.D. and A.N.; writing—original draft preparation, A.C. and A.B.; writing—review and editing, A.B.; visualization, A.B.; supervision, C.D.N., A.T. and G.S.; project administration, C.D.N. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Institutional Review Board of Sant’Andrea Hospital (protocol code 925/2011 and date of approval 2 December 2011).

Informed Consent Statement

Informed consent was obtained from all subjects involved in the study.

Data Availability Statement

Data supporting reported results are deposited at https://gbox.garr.it/ (accessed on 4 February 2022).

Conflicts of Interest

The authors declare no conflict of interest.

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Table
Table 1. Patients’ characteristics and outcomes, according to prostate cancer diagnosis.
Table 1. Patients’ characteristics and outcomes, according to prostate cancer diagnosis.
Patients’ Characteristics and OutcomesOverallNo PCaPCap
n = 955n = 560 (59%)n = 395 (41%)-
Age, years65 (60–75)66 (59–71)70 (66–74)0.002
BMI, kg/m226 (24.1–30.2)26.3 (24.5–29.2)26.2 (24.2–29.5)0.572
MetS, n (%)209 (22%)112 (20%)97 (24%)0.123
Hypertension, n (%)220 (23%)130 (23%)90 (23%)0.876
Tryglicerides, mg/dL125 (88–172)120 (80–156)128 (97–158)0.345
HDL, mg/dL50 (40–57)51 (39–56)48 (35–56)0.635
Waist, cm101 (95–105)100 (96–110)102 (95–115)0.898
Glucose level, g/dL95 (80–107)90 (84–115)98 (85–112)0.786
Prostate Volume, mL50 (36–69)58 (45–90)40 (31–60)0.001
PSA at baseline, ng/mL6 (3.2–12)5.6 (4.4–8.3)6.8 (5.1–10)0.001
PASE score120.5 (80–170)125 (83–190)108 (70–145)0.001
Personal history of CHD, n (%)79 (8.2%)42 (7.5%)37 (9.4%)0.302
Q-waves, n (%)16 (2%)9 (2%)7 (2%)0.792
Myocardial infarction, n (%)30 (3%)17 (3%)13 (3%)0.482
Revascularization, n (%)33 (3%)20 (4%)13 (3%)0.452
HG-PCa, n (%)238 (25%)-238 (60%)-
Data are presented as Median (IQR) BMI = body mass index, MetS = metabolic syndrome, PASE = Physical Activity Scale for the Elderly, CHD = coronary heart disease, HG-PCa = high grade prostate cancer.
Table
Table 2. Univariable and multivariable logistic regression analyses to identify predictors of prostate cancer diagnosis.
Table 2. Univariable and multivariable logistic regression analyses to identify predictors of prostate cancer diagnosis.
Predictors of Prostate Cancer DiagnosisUnivariable AnalysisMultivariable Analysis
OR95% CIp ValueOR95% CIp-Value
Lower HigherLower Higher
Age, years1.051.0211.0830.0021.031.0121.0550.012
BMI, kg/m21.030.9731.1140.540----
Metabolic Syndrome1.160.7721.8020.454----
Prostate volume, mL0.960.9510.9720.0010.970.9660.9800.001
PSA at baseline, ng/mL1.071.0421.0930.0011.101.0631.1420.001
PASE score0.330.1000.7820.0010.280.1240.6680.001
Personal hystory of CHD1.080.6321.9040.828----
BMI = body mass index, MetS = metabolic syndrome, PASE = Physical Activity Scale for the Elderly, CHD = coronary heart disease, HG-PCa = high grade prostate cancer.
Table
Table 3. Unilabiate and multivariate logistic regression analyses to identify predictors of high grade prostate cancer.
Table 3. Unilabiate and multivariate logistic regression analyses to identify predictors of high grade prostate cancer.
Predictors of High Grade Prostate CancerUnivariable AnalysisMultivariable Analysis
OR95% CIp ValueOR95% CIp-Value
Lower HigherLower Higher
Age, years1.041.0011.0600.0321.051.0171.0830.003
BMI, kg/m21.100.9811.2320.234----
Metabolic Syndrome2.021.3013.3030.0011.501.1002.5600.023
Prostate volume, mL0.960.9510.9930.0010.980.9780.9990.008
PSA at baseline, ng/mL1.081.0621.1120.0011.091.0381.1600.001
PASE score0.230.0900.4350.0010.160.0240.5760.001
Personal hystory of CHD0.830.7733.3020.454----
BMI = body mass index, MetS = metabolic syndrome, PASE = Physical Activity Scale for the Elderly, CHD = coronary heart disease, HG-PCa = high grade prostate cancer.
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Cicione, A.; Brassetti, A.; Lombardo, R.; Franco, A.; Turchi, B.; D’Annunzio, S.; Nacchia, A.; Tubaro, A.; Simone, G.; De Nunzio, C. Metabolic Syndrome and Physical Inactivity May Be Shared Etiological Agents of Prostate Cancer and Coronary Heart Diseases. Cancers 2022, 14, 936. https://doi.org/10.3390/cancers14040936

AMA Style

Cicione A, Brassetti A, Lombardo R, Franco A, Turchi B, D’Annunzio S, Nacchia A, Tubaro A, Simone G, De Nunzio C. Metabolic Syndrome and Physical Inactivity May Be Shared Etiological Agents of Prostate Cancer and Coronary Heart Diseases. Cancers. 2022; 14(4):936. https://doi.org/10.3390/cancers14040936

Chicago/Turabian Style

Cicione, Antonio, Aldo Brassetti, Riccardo Lombardo, Antonio Franco, Beatrice Turchi, Simone D’Annunzio, Antonio Nacchia, Andrea Tubaro, Giuseppe Simone, and Cosimo De Nunzio. 2022. "Metabolic Syndrome and Physical Inactivity May Be Shared Etiological Agents of Prostate Cancer and Coronary Heart Diseases" Cancers 14, no. 4: 936. https://doi.org/10.3390/cancers14040936

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