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Abiri B, Ahmadi AR, Valizadeh A, Abbaspour F, Valizadeh M, Hedayati M. Obesity and thyroid cancer: unraveling the connection through a systematic review and meta-analysis of cohort studies. J Diabetes Metab Disord 2024; 23:461-474. [PMID: 38932807 PMCID: PMC11196530 DOI: 10.1007/s40200-024-01425-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 03/21/2024] [Indexed: 06/28/2024]
Abstract
Background The relationship between adiposity indicators and thyroid cancer (TC) risk has garnered increasing attention due to the rising prevalence of obesity and its potential impact on cancer incidence. We conducted a comprehensive meta-analysis to investigate this association across various effect measures. Method Until July 2022, a comprehensive search of databases was conducted to identify cohort studies that assessed the association between adiposity and the development of TC. Meta-analysis was performed using random effects models. Subgroup analyses were conducted to explore heterogeneity. Publication bias was assessed using Begg's tests. Results A systematic literature search identified 27 eligible studies reporting odds ratios (OR), relative risks (RR), or hazard ratios (HR) as effect measures. Pooling the studies irrespective of the effect measure, a significant positive association between adiposity indicators and TC risk was observed, yielding an effect estimate of 1.16 (95% CI 1.12-1.21). The combined effect estimate for OR/RR studies was 1.10 (95%CI 1.04-1.17), while HR studies yielded an effect estimate of 1.20 (95%CI 1.13-1.26). Subgroup analyses revealed associations across different age groups, obesity indices, and regions, with some variations based on effect measure. Meta-regression identified follow-up duration as a confounding factor only in HR studies. Conclusion The synthesis of 27 studies with diverse designs and populations underscores a robust positive association between adiposity and TC risk, providing compelling evidence for the potential role of increased adiposity in TC development. Supplementary Information The online version contains supplementary material available at 10.1007/s40200-024-01425-3.
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Affiliation(s)
- Behnaz Abiri
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Ali Valizadeh
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Faeze Abbaspour
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Majid Valizadeh
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Hedayati
- Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Wang X, Yu Y, Ji Y, Ma Z, Tan J, Jia Q, Li N, Zheng W. Clinical characteristics and therapeutic response of differentiated thyroid carcinoma with obesity and diabetes. BMC Cancer 2023; 23:1077. [PMID: 37940857 PMCID: PMC10631042 DOI: 10.1186/s12885-023-11591-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 10/30/2023] [Indexed: 11/10/2023] Open
Abstract
BACKGROUND The effects of obesity and diabetes on the clinical outcomes of differentiated thyroid cancer (DTC) remain unclear. OBJECTIVES To explore the association between obesity and diabetes with pathological features and therapeutic response of DTC. METHODS Patients were categorized based on body mass index (BMI) and glycemic status. Compare the correlation between BMI and glycemic status with pathological features and therapeutic response of DTC. To analyze the independent risk factors for the aggressiveness of DTC. RESULTS The proportion of patients with bilateral tumors was higher in the overweight, obese and diabetes group (P = 0.001, 0.045). The overweight group demonstrated a higher TNM stage (P = 0.004), while the T and TNM stages were higher in the diabetes group (P = 0.032, 0.000). The probability of distant metastasis increases by 37.4% for each unit of BMI increase (odds ratio (OR) = 1.374, CI 95% 1.061-1.778, P < 0.05). The BMI of Biochemical Incomplete Response (BIR) is significantly higher than that of Excellent Response (ER) (P = 0.015), the fasting plasma glucose (FPG) of Structural Incomplete (SIR) was significantly higher than that of ER and BIR (P = 0.030, 0.014). CONCLUSION Obesity and diabetes have effect on DTC aggressiveness. BMI and FPG have correlation with the therapeutic response of DTC patients.
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Affiliation(s)
- Xuan Wang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Yang Yu
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Yanhui Ji
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Ziyu Ma
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Jian Tan
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Qiang Jia
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Ning Li
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Wei Zheng
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, China.
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Alqahtani SM, Altalhi BA, Alalawi YS, AlFattani AA, Al-Sobhi SS. Weighty Matters: The Obesity-Thyroid Nodule Connection Unveiling the Impact of Obesity on Thyroid Cancer Risk. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1658. [PMID: 37763777 PMCID: PMC10534825 DOI: 10.3390/medicina59091658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/06/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023]
Abstract
Background and Objectives: The effect of obesity on the development/progression of thyroid nodules with uncertain cytology is unknown. Therefore, our objective was to assess the role of body mass index (BMI) in predicting malignancy in patients with atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) nodules. Materials and Methods: We retrospectively analyzed 113 patients with available BMI data and final histopathology of benign or differentiated thyroid cancer. Patients were classified into four groups based on BMI: <18.5 (underweight), 18.5-24.9 (normal weight), 25-29.9 (overweight), and ≥30 (obesity) kg/m2. The association between risk of malignancy and BMI was examined for all data and subgroups based on nodule size, sex, and age. Results: Overall, 44.2% were obese, 36.3% were ≥45 years, and 75.4% were women. Final pathological results showed malignant nodules in 52 patients (46%) and benign nodules in 61 patients (54%) (mean age: 41 ± 11.6 vs. 39.9 ± 11.7 years; p = 0.62). Men had more malignant nodules than benign nodules (32.7% vs. 16.4%, p < 0.05). Overall, no significant correlation was identified between the risk of thyroid cancer and BMI, and the risk of malignancy was not significantly different between obese men and women (p = 0.4). However, in individuals with BMI < 30 kg/m2 (non-obese group), malignant nodules were more frequent in men than in women (71% vs. 41%, p = 0.04). No significant difference was observed in mean nodule size between the benign and malignant groups. Furthermore, BMI was not related to increased risk of malignancy in multiple logistic regression models using all data, even after controlling for confounding variables (odds ratio, 0.99, 95% confidence interval: 0.93-1.06, p = 0.87) or when stratifying by sex. Conclusions: Our study showed no correlation between obesity and thyroid cancer in patients with AUS/FLUS. Moreover, men had more malignant nodules than benign nodules. Further well-designed prospective studies are required to confirm our findings.
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Affiliation(s)
- Saad M. Alqahtani
- Department of Surgery, College of Medicine, Majmaah University, Al-Majmaah 11952, Saudi Arabia
| | - Bassam A. Altalhi
- Department of Surgery, King Fahad Armed Forces Hospital, Jeddah 21159, Saudi Arabia;
| | - Yousef S. Alalawi
- Department of Surgery, King Salman Armed Forces Hospital Northwestern Region, Tabuk 71411, Saudi Arabia;
| | - Areej A. AlFattani
- Department of Biostatistics, Epidemiology, and Scientific Computing, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia;
| | - Saif S. Al-Sobhi
- Department of Surgery, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia;
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Mohammadian Khonsari N, Shahrestanaki E, Ehsani A, Asadi S, Sokoty L, Mohammadpoor Nami S, Hakak-Zargar B, Qorbani M. Association of childhood and adolescence obesity with incidence and mortality of adulthood cancers. A systematic review and meta-analysis. Front Endocrinol (Lausanne) 2023; 14:1069164. [PMID: 36742402 PMCID: PMC9892178 DOI: 10.3389/fendo.2023.1069164] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 01/02/2023] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Prevalence and subsequent conditions of childhood and adolescent obesity are increasing. It has been seen that obesity in youth is associated with adulthood cancer. This systematic review and meta-analysis aimed to determine the pooled association of childhood obesity with cancers in adulthood. METHODS In this systematic review, international electronic databases such as Scopus, PubMed, Web of Science, and EMBASE were searched using relevant keywords until February 2022. All Cohort studies assessing the association of childhood and adolescent obesity (under 18 years old) with the incidence and mortality of all types of cancers were included. Two independent reviewers screened and carried out the quality assessment of included studies. Between-studies heterogeneity was assessed using the I squared and Cochran's Q tests. Random/fixed-effect meta-analyses were used to pool the appropriate effect sizes (Hazard ratios (HR)). RESULTS Overall, 46 studies were found to be relevant and were included in this study. Based on the random-effects model meta-analysis, childhood obesity increased the hazard of cancer incidence and mortality in adulthood by 33% (HR: 1.33, 95%CI (1.25, 1.41)) and by 28% (HR: 1.28, 95%CI (1.13, 1.42)), respectively. In the subgroups meta-analysis, the HR of childhood obesity and adulthood cancer incidence mortality in women was higher than in men (HR=1.39, 95%CI (1.25, 1.53) vs HR= 1.20, 95%CI (1.07, 1.32)) and (HR= 1.40, 95%CI (1.10, 1.69) vs HR=1.20, 95%CI (1.04, 1.36)) respectively. CONCLUSION This study found that obesity in childhood and adolescence is associated with a significant increase in the incidence and mortality of cancers in adulthood. Prevention of childhood obesity, in addition to its short-term beneficial effects, can reduce the burden of cancer in adulthood. The data sets of this study are present in the Tables of the current manuscript. Moreover this study was registered online in PROSPERO (registration code: CRD42022331958). SYSTEMIC REVIEW REGISTRATION https://www.crd.york.ac.uk/Prospero/, identifier CRD42022331958.
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Affiliation(s)
- Nami Mohammadian Khonsari
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
- *Correspondence: Mostafa Qorbani, ; Nami Mohammadian Khonsari,
| | - Ehsan Shahrestanaki
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Amir Ehsani
- School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Sara Asadi
- Western Sydney University, Translational Health Research Institute, Sydney, NSW, Australia
| | - Leily Sokoty
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Sahar Mohammadpoor Nami
- Social Determinants of Health Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | | | - Mostafa Qorbani
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
- *Correspondence: Mostafa Qorbani, ; Nami Mohammadian Khonsari,
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Deligiorgi MV, Siasos G, Vakkas L, Trafalis DT. Charting the Unknown Association of COVID-19 with Thyroid Cancer, Focusing on Differentiated Thyroid Cancer: A Call for Caution. Cancers (Basel) 2021; 13:5785. [PMID: 34830939 PMCID: PMC8616091 DOI: 10.3390/cancers13225785] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/10/2021] [Accepted: 11/16/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Conceived of as the "silver lining" of the dark cloud of the coronavirus disease 2019 (COVID-19) pandemic, lessons taught by this catastrophe should be leveraged by medical authorities and policy makers to optimize health care globally. A major lesson is that resilient health systems should absorb sudden shocks incited by overwhelming health emergencies without compromising the continuum of care of chronic diseases, especially of cancer. METHODS The present review dissects the association between COVID-19 and thyroid cancer (TC), especially with differentiated TC (DTC), focusing on available data, knowledge gaps, current challenges, and future perspectives. RESULTS Obesity has been incriminated in terms of both COVID-19 severity and a rising incidence of TC, especially of DTC. The current conceptualization of the pathophysiological landscape of COVID-19-(D)TC association implicates an interplay between obesity, inflammation, immunity, and oxidative stress. Whether COVID-19 could aggravate the health burden posed by (D)TC or vice versa has yet to be clarified. Improved understanding and harnessing of the pathophysiological landscape of the COVID-19-(D)TC association will empower a mechanism-guided, safe, evidence-based, and risk-stratified management of (D)TC in the COVID-19 era and beyond. CONCLUSION A multidisciplinary patient-centered decision-making will ensure high-quality (D)TC care for patients, with or without COVID-19.
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Affiliation(s)
- Maria V. Deligiorgi
- Clinical Pharmacology Unit–Department of Pharmacology, Faculty of Medicine, National and Kapodistrian University of Athens, 75 Mikras Asias St., 11527 Athens, Greece; (L.V.); (D.T.T.)
| | - Gerasimos Siasos
- First Department of Cardiology, Hippokration General Hospital of Athens, Faculty of Mediine, National and Kapodistrian University of Athens, 11527 Athens, Greece;
| | - Lampros Vakkas
- Clinical Pharmacology Unit–Department of Pharmacology, Faculty of Medicine, National and Kapodistrian University of Athens, 75 Mikras Asias St., 11527 Athens, Greece; (L.V.); (D.T.T.)
| | - Dimitrios T. Trafalis
- Clinical Pharmacology Unit–Department of Pharmacology, Faculty of Medicine, National and Kapodistrian University of Athens, 75 Mikras Asias St., 11527 Athens, Greece; (L.V.); (D.T.T.)
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6
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Morbid Obesity and Thyroid Cancer Rate. A Review of Literature. J Clin Med 2021; 10:jcm10091894. [PMID: 33925549 PMCID: PMC8123763 DOI: 10.3390/jcm10091894] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/23/2021] [Accepted: 04/25/2021] [Indexed: 02/08/2023] Open
Abstract
In the past three decades, several recent studies have analyzed the alarming increase of obesity worldwide, and it has been well established that the risk of many types of malignancies is increased in obese individuals; in the same period, thyroid cancer has become the fastest growing cancer of all malignancies. We investigated the current literature to underline the presence of a connection between excess body weight or Body Mass Index (BMI) and risk of thyroid cancer. Previous studies stated that the contraposition between adipocytes and adipose-resident immune cells enhances immune cell production of multiple pro-inflammatory factors with subsequent induction of hyperlipidemia and vascular injury; these factors are all associated with oxidative stress and cancer development and/or progression. Moreover, recent studies made clear the mitogenic and tumorigenic action of insulin, carried out through the stimulation of mitogen-activated protein kinase (MAPK) and phosphoinositide-3 kinase/AKT (PI3K/AKT) pathways, which is correlated to the hyperinsulinemia and hyperglycemia found in obese population. Our findings suggest that obesity and excess body weight are related to an increased risk of thyroid cancer and that the mechanisms that combine overweight with this cancer should be searched for in the adipokine pathways and chronic inflammation onset.
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Youssef MR, Reisner ASC, Attia AS, Hussein MH, Omar M, LaRussa A, Galvani CA, Aboueisha M, Abdelgawad M, Toraih EA, Randolph GW, Kandil E. Obesity and the prevention of thyroid cancer: Impact of body mass index and weight change on developing thyroid cancer - Pooled results of 24 million cohorts. Oral Oncol 2020; 112:105085. [PMID: 33171329 DOI: 10.1016/j.oraloncology.2020.105085] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 10/28/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND Body weight may be a modifiable risk factor predisposing to different cancers. To establish a potential impact of weight change on thyroid cancer risk, we conducted a meta-analysis to evaluate the effect of body mass index (BMI) and weight change over time as a risk of developing thyroid cancer (TC). METHODS A systematic search was performed up to February 25, 2020. Pooled relative risk (RR) were estimated using fixed and random models. Heterogeneity between articles was examined using Q-test and I2 index. Evaluation of publication bias was conducted with Egger's regression test. RESULTS A total of 31 studies including 24,489,477 cohorts were eligible. Pooled analysis revealed that normal and underweight cohorts were associated with a decreased risk of TC (RR = 0.68, 95%CI = 0.65-0.71, p < 0.001) and (RR = 0.92, 95%CI = 0.91-0.93, p < 0.001), respectively. In contrast, overweight and obese cohorts were more likely to develop TC (RR = 1.26, 95%CI = 1.24-1.28, p < 0.001 and RR = 1.50, 95%CI = 1.45-1.55, p < 0.001, respectively). Obesity was associated with higher risk of developing TC among women (RR = 1.29, 95%CI = 1.14-1.46, p < 0.001), but not men (RR = 1.25, 95%CI = 0.97-1.62, p = 0.08). Furthermore, weight gain increased the risk of developing TC (RR = 1.18, 95%CI = 1.14-1.22, p < 0.001), while weight loss decreased the risk (RR = 0.89, 95%CI = 0.85-0.93, p < 0.001). Results showed similar trends of weight change effect in both males and females. CONCLUSIONS Obesity is associated with higher risk of developing TC in women. However, maintaining a healthy weight is associated with reduced risk of TC in both women and men. Shifting our practice to include weight control strategies will help lead to cancer prevention.
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Affiliation(s)
- Mohanad R Youssef
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA
| | | | - Abdallah S Attia
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA
| | | | - Mahmoud Omar
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA
| | - Anna LaRussa
- Tulane University, School of Medicine, New Orleans, LA, USA
| | - Carlos A Galvani
- Division of Minimally Invasive Surgery and Bariatric, Department of Surgery, Tulane University, New Orleans, LA 70112, USA
| | - Mohamed Aboueisha
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA
| | - Mohamed Abdelgawad
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA; Department of Otolaryngology Head and Neck Surgery, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Eman Ali Toraih
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA; Genetics Unit, Department of Histology and Cell Biology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Gregory W Randolph
- Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary and Harvard Medical School, Boston, MA, USA
| | - Emad Kandil
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA.
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8
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Sadeghi H, Rafei M, Bahrami M, Haghdoost A, Shabani Y. Attributable risk fraction of four lifestyle risk factors of thyroid cancer: a meta-analysis. J Public Health (Oxf) 2019; 40:e91-e98. [PMID: 28977647 DOI: 10.1093/pubmed/fdx088] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 07/18/2017] [Indexed: 11/13/2022] Open
Abstract
Background Lifestyle risk factors such as obesity, overweight, smoking and radiation exposure related to thyroid cancer. This study estimated the amount of excess risk that attributed to risk factors. Methods Major electronic databases were searched until February 2016. Epidemiological studies addressing the association between lifestyle risk factors and thyroid cancer were enrolled. The results were expressed as ARF with 95% confidence intervals (CIs) using a random-effects-model. Results We identified a total of 13 321 references and included 17 studies. The excess risk of thyroid cancer attributable to radiation exposure was 14% (95% CI: 5%, 23%; eight studies, I2 = 88.7%), to obesity was 13% (95% CI: 5%, 21%; four studies, I2 = 68.7%), to overweight was 10% (95% CI: 2%, 17%; four studies, I2 = 4.1%) and to smoking was -13% (95% CI: -33%, 6%; five studies, I2 = 30.6%). So obesity, overweight and radiation exposure are significantly associated with increased thyroid cancer risk and smoking has a protective effect on thyroid cancer but not significant. Conclusion A significant amount of the incidence of thyroid cancer is attributable to lifestyle risk factors. Since these factors are entirely preventable, so it is necessary to reduce factors that are associated with increased thyroid cancer risk and proper education to the community. Thus weight loss and protection against radiation can effectively reduce the incidence rate of thyroid cancer but smoking can have a protective effect.
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Affiliation(s)
- Hajar Sadeghi
- Faculty of Khomein University of Medical Sciences, Khomein, Iran
| | | | | | - AliAkbar Haghdoost
- Community Medicine Department and Physiology Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Yazdan Shabani
- Member of Student Research Committee of Arak University of Medical Sciences, Arak, Iran
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Katz LH, Levi Z, Twig G, Kark JD, Leiba A, Derazne E, Liphshiz I, Keinan-Boker L, Eisenstein S, Afek A. Risk factors associated with gastroenteropancreatic neuroendocrine tumors in a cohort of 2.3 million Israeli adolescents. Int J Cancer 2018; 143:1876-1883. [PMID: 29744856 DOI: 10.1002/ijc.31589] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 04/16/2018] [Indexed: 12/27/2022]
Abstract
We investigated whether obesity and sociodemographic factors at adolescence are associated with incident gastroenteropancreatic neuroendocrine tumors (GEP-NET).Our cohort included 2.3 million Israeli adolescents examined at ages 16 to 19 years between 1967 and 2010. The baseline database included sex, country of birth, residential socioeconomic status (SES), body-mass index (BMI) and height. Participants were followed through linkage with the National Cancer Registry up to 2012. We identified 221 cases of GEP-NET (66 pancreatic, 52 gastric, 39 rectal, 27 appendiceal, 23 small bowel and 14 colonic). Immigration from the Former Soviet Union (FSU) was associated with the risk of small bowel and rectal NET's, [Hazard Ratio (HR) 4.79, 95% Confidence Interval (CI) 1.37-16.76 and 3.43, 95% CI 1.20-9.83, respectively].Height >75th percentile and BMI ≥ 85th percentile were associated with increased risk of gastric NET (HR 2.25 95% CI 1.14-4.42 and HR 2.38, 95% CI 1.19-4.75, respectively). Female sex was associated with appendiceal NET (HR 2.30, 95% CI 1.06-4.96) while male gender was associated with an increased risk for NET of the small bowel [HR 4.72 (95% CI 1.10-20.41)].In conclusion, our findings suggest different risk factor associations with the various GEP-NETS: immigrants from the FSU were at increased risk for small bowel and rectal NET; increased height and weight were associated with the risk of gastric NET and females were at increased risk for appendiceal NET. Further focus on the FSU population is indicated in addition to studies verifying the association of BMI and height with gastric NET.
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Affiliation(s)
- Lior H Katz
- The Gastroenterology Department, Sheba Medical Center, Tel-Hashomer, Israel
| | - Zohar Levi
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel.,The Gastroenterology Department, Rabin Medical Center, Petach Tikva, Israel
| | - Gilad Twig
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel.,The Israel Defense Forces Medical Corps.,The Dr. Pinchas Bornstein Talpiot Medical Leadership Program, Sheba Medical Center.,Institute of Endocrinology, Sheba Medical Center, Tel Hashomer, Israel
| | - Jeremy D Kark
- Hebrew University-Hadassah School of Public Health and Community Medicine, Ein Kerem, Jerusalem, Israel
| | - Adi Leiba
- The Israel Defense Forces Medical Corps
| | | | | | | | - Sapir Eisenstein
- Hebrew University-Hadassah School of Medicine, Jerusalem, Israel
| | - Arnon Afek
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel.,The general manager office, Tel Hashomer, Israel
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10
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Hidayat K, Du X, Shi BM. Body fatness at a young age and risks of eight types of cancer: systematic review and meta-analysis of observational studies. Obes Rev 2018; 19:1385-1394. [PMID: 30047231 DOI: 10.1111/obr.12705] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 04/13/2018] [Accepted: 04/15/2018] [Indexed: 12/13/2022]
Abstract
The associations between body fatness at a young age (childhood, adolescence and young adulthood; age ≤ 30 years) and diffuse large B-cell lymphoma (DLBCL), oesophageal adenocarcinoma, gastric cardia cancer, hepatocellular carcinoma, multiple myeloma, pancreatic cancer, renal cell cancer and thyroid cancer remain inconclusive. We performed a comprehensive systematic literature review and meta-analysis of observational studies to clarify the associations between body fatness at a young age and the risks of these cancers. PubMed and Web of Science databases were searched for relevant observational studies. Fifty-six articles yielded data on 27,559 cancer cases, including 3,170 DLBCL, 1,491 oesophageal adenocarcinoma, 1,103 gastric cardia cancer, 1,067 hepatocellular carcinoma, 3,090 multiple myeloma, 7,220 pancreatic cancer, 6,212 renal cell cancer and 4,206 thyroid cancer cases. Each 5 kg m-2 increase in body mass index at a young age was positively associated with DLBCL (relative risk [RR] 1.21, 95% confidence interval [CI] 1.09, 1.35), oesophageal adenocarcinoma (RR 1.88, 95% CI 1.37, 2.57), gastric cardia cancer (RR 1.59, 95% CI 1.15, 2.21), hepatocellular carcinoma (RR 1.31, 95% CI 1.13, 1.51), multiple myeloma (RR 1.23, 95% CI 1.15, 1.30), pancreatic cancer (RR 1.17, 95% CI 1.11, 1.24), renal cell cancer (RR 1.22, 95% CI 1.16, 1.28) and thyroid cancer (RR 1.12, 95% CI 1.07, 1.17). In summary, higher body fatness at a young age increases the risks of developing various types of cancer later in life. Prevention of overweight and obesity in children, adolescents and young adults should therefore be emphasized to reverse the obesity epidemic and thereby avoid further increases in the burden of cancer attributed to excess body fatness.
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Affiliation(s)
- K Hidayat
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - X Du
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - B-M Shi
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Soochow University, Suzhou, China
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Gąsior-Perczak D, Pałyga I, Szymonek M, Kowalik A, Walczyk A, Kopczyński J, Lizis-Kolus K, Trybek T, Mikina E, Szyska-Skrobot D, Gadawska-Juszczyk K, Hurej S, Szczodry A, Słuszniak A, Słuszniak J, Mężyk R, Góźdź S, Kowalska A. The impact of BMI on clinical progress, response to treatment, and disease course in patients with differentiated thyroid cancer. PLoS One 2018; 13:e0204668. [PMID: 30273371 PMCID: PMC6166948 DOI: 10.1371/journal.pone.0204668] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 09/12/2018] [Indexed: 12/21/2022] Open
Abstract
Introduction Obesity is a serious health problem worldwide, particularly in developed countries. It is a risk factor for many diseases, including thyroid cancer. The relationship between obesity and prognostic factors of thyroid cancer is unclear. Aims We sought to ascertain the relationship between body mass index (BMI) and clinicopathological features increasing the risk of poor clinical course, treatment response, and clinical outcome in patients with differentiated thyroid cancer (DTC). Subjects & methods The study included 1181 patients with DTC (88% women and 12% men) treated at a single center from 2000 to 2016. BMI before surgery and aggressive clinicopathological features, according to the American Thyroid Initial Risk stratification system, were analyzed. The relationship between BMI and initial risk, treatment response, and final status of the disease was evaluated, incorporating the revised 2015 American Thyroid Association guidelines and the 8th edition of the American Joint Committee on Cancer/Tumor-Node-Metastasis (AJCC/TNM) staging system. Patients were stratified according to the World Health Organization classification of BMI. Statistical analysis was performed using univariate and multivariate logistic regression analysis. Results Median follow-up was 7.7 years (1–16 years). There were no significant associations between BMI and extrathyroidal extension (microscopic and gross), cervical lymph node metastasis, or distant metastasis in univariate and multivariate analyses. BMI did not affect initial risk, treatment response or disease outcome. Obesity was more prevalent in men (p = 0.035) and in patients ≥55 years old (p = 0.001). There was no statistically significant relationship between BMI and more advanced TNM stage in patients ≤55 years old (stage I vs. stage II) (p = 0.266) or in patients >55 years old (stage I–II vs. III–IV) (p = 0.877). Conclusions Obesity is not associated with more aggressive clinicopathological features of thyroid cancer. Obesity is not a risk factor for progression to more advanced stages of disease, nor is it a prognostic factor for poorer treatment response and clinical outcome.
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Affiliation(s)
| | - Iwona Pałyga
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | - Monika Szymonek
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | - Artur Kowalik
- Department of Molecular Diagnostics, Holycross Cancer Centre, Kielce, Poland
| | | | - Janusz Kopczyński
- Department of Surgical Pathology, Holycross Cancer Centre, Kielce, Poland
| | | | - Tomasz Trybek
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | - Estera Mikina
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | | | | | - Stefan Hurej
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | - Artur Szczodry
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
| | - Anna Słuszniak
- Laboratory of Tumor Markers, Holycross Cancer Centre, Kielce, Poland
| | - Janusz Słuszniak
- Department of Surgical Oncology, Holycross Cancer Centre, Kielce, Poland
| | - Ryszard Mężyk
- Cancer Epidemiology, Holycross Cancer Centre, Kielce, Poland
| | - Stanisław Góźdź
- Oncology Clinic, Holycross Cancer Centre, Kielce, Poland
- Faculty of Health Sciences, Jan Kochanowski University, Kielce, Poland
| | - Aldona Kowalska
- Endocrinology Clinic, Holycross Cancer Centre, Kielce, Poland
- Faculty of Health Sciences, Jan Kochanowski University, Kielce, Poland
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12
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Yin DT, He H, Yu K, Xie J, Lei M, Ma R, Li H, Wang Y, Liu Z. The association between thyroid cancer and insulin resistance, metabolic syndrome and its components: A systematic review and meta-analysis. Int J Surg 2018; 57:66-75. [PMID: 30081182 DOI: 10.1016/j.ijsu.2018.07.013] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 06/15/2018] [Accepted: 07/28/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND Thyroid cancer is rapidly increasing in incidence worldwide in the past several decades, same as the incidence of metabolic syndrome. We performed a system review and meta-analysis of the association between metabolic syndrome, its components and insulin resistance and thyroid cancer incidence. METHODS We searched several computer-assisted databases PUBMED, EMBASE and ISI Web of Science to identify studies published before 31st January 2018. Every study must report either risk estimates of thyroid cancer incidence with 95% confidence interval (CI) or related data can speculate. Two investigators independently identified eligible studies and extracted data. Evaluating the summaries of relative risk estimates use both fixed and random effects methods. RESULTS We found 42 articles met the inclusion criteria of this review. There is an increased risk for thyroid cancer for patients with insulin resistance (relative risk [RR] = 1.59, 95%confidence interval [CI] = 1.12-2.27, P = 0.01), dysglycemia (RR = 1.40, 95%CI = 1.15-1.70,P < 0.001), high BMI (RR = 1.35,95%CI = 1.23-1.48,P < 0.001) and hypertension(RR = 1.34,95%CI = 1.22-1.47, p < 0.001). However, patients with dyslipidemia, both total cholesterol (RR = 1.09, 95%CI = 0.98-1.21, P = 0.13) and triglyceride (RR = 1.01, 95%CI = 0.91-1.12, P = 0.82) was not associated with thyroid cancer. CONCLUSIONS Our meta-analysis showed Insulin Resistance, dysglycemia, high BMI and hypertension significantly increased the thyroid cancer risk. These results may help identify people with high risk of thyroid cancer and change to healthy life style.
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Affiliation(s)
- De-Tao Yin
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China.
| | - Huanan He
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China; Department of General Surgery, the First People's Hospital of Pingdingshan, Pingdingshan, 467000, PR China
| | - Kun Yu
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
| | - Jing Xie
- Center for Eye Research Australia, Royal Victorian Eye and Ear Hospital, University of Melbourne, Melbourne, Australia
| | - Mengyuan Lei
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
| | - Runsheng Ma
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
| | - Hongqiang Li
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
| | - Yongfei Wang
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
| | - Zhen Liu
- Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, PR China; Key Discipline Laboratory of Clinical Medicine Henan, Zhengzhou, 450052, PR China
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13
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Sado J, Kitamura T, Sobue T, Sawada N, Iwasaki M, Sasazuki S, Yamaji T, Shimazu T, Tsugane S. Risk of thyroid cancer in relation to height, weight, and body mass index in Japanese individuals: a population-based cohort study. Cancer Med 2018; 7:2200-2210. [PMID: 29577664 PMCID: PMC5943544 DOI: 10.1002/cam4.1395] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/12/2017] [Accepted: 11/10/2017] [Indexed: 12/11/2022] Open
Abstract
Greater height and body mass index (BMI) have been associated with an increased risk of thyroid cancer incidence in Western countries. However, few epidemiological studies have assessed the association between anthropometric factors, such as BMI, height, or weight, and thyroid cancer incidence in Asian populations. Using the population‐based Japan Public Health Center‐based prospective study database, we investigated the relationship between anthropometric factors and thyroid cancer incidence. Data on anthropometric factors were collected through a self‐administered questionnaire at baseline. The hazard ratios (HRs) and 95% confidence intervals (CIs) were calculated using the Cox proportional hazards model, and the exposure level was categorized into quintiles. A total of 49,062 men and 53,661 women enrolled between 1990 and 1994 were included in our analyses, and 191 cases (37 in men and 154 in women) of thyroid cancer were identified, with 1,695,702 person‐years of follow‐up until 2010. Compared with the male group with height ≤160 cm, HRs of the male groups with height 165–168 cm and ≥169 cm were 3.92 (95% CI; 1.33–11.55, P = 0.013) and 4.24 (95% CI; 1.32–13.61, P = 0.015), respectively, and the HR per 5‐cm increase in height was 1.12 (95% CI 1.06–1.18, P < 0.001). In contrast, the association between anthropometric features and the risk of thyroid cancer did not significantly differ among women. In this population, an increase in risk for increased height was observed in men, but no associations between anthropometric indexes and thyroid cancer risk were observed in women.
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Affiliation(s)
- Junya Sado
- Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Tetsuhisa Kitamura
- Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Tomotaka Sobue
- Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Norie Sawada
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Motoki Iwasaki
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Shizuka Sasazuki
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Taiki Yamaji
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Taichi Shimazu
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Shoichiro Tsugane
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
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14
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Adult Height in Relation to the Incidence of Cancer at Different Anatomic Sites: the Epidemiology of a Challenging Association. Curr Nutr Rep 2016. [DOI: 10.1007/s13668-016-0152-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Schmid D, Ricci C, Behrens G, Leitzmann MF. Adiposity and risk of thyroid cancer: a systematic review and meta-analysis. Obes Rev 2015; 16:1042-54. [PMID: 26365757 DOI: 10.1111/obr.12321] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/11/2015] [Accepted: 08/11/2015] [Indexed: 11/30/2022]
Abstract
Thyroid cancer incidence has increased rapidly over time, as has obesity prevalence. A link between the two appears plausible, but the relation of adiposity to thyroid cancer remains incompletely understood. We performed a meta-analysis of adiposity measures and thyroid cancer using studies identified through October 2014. Twenty-one articles yielded data on 12,199 thyroid cancer cases. We found a statistically significant 25% greater risk of thyroid cancer in overweight individuals and a 55% greater thyroid cancer risk in obese individuals as compared with their normal-weight peers. Each 5-unit increase in body mass index (BMI), 5 kg increase in weight, 5 cm increase in waist or hip circumference and 0.1-unit increase in waist-to-hip ratio were associated with 30%, 5%, 5% and 14% greater risks of thyroid cancer, respectively. When evaluated by histologic type, obesity was significantly positively related to papillary, follicular and anaplastic thyroid cancers, whereas it revealed an inverse association with medullary thyroid cancer. Both general and abdominal adiposity are positively associated with thyroid cancer. However, relations with BMI vary importantly by tumour histologic type.
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Affiliation(s)
- D Schmid
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - C Ricci
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - G Behrens
- 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
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16
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Jing Z, Hou X, Liu Y, Yan S, Wang R, Zhao S, Wang Y. Association between height and thyroid cancer risk: a meta-analysis of prospective cohort studies. Int J Cancer 2015; 137:1484-90. [PMID: 25693727 DOI: 10.1002/ijc.29487] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 02/12/2015] [Indexed: 11/06/2022]
Abstract
While several epidemiological studies have investigated the relationship between height and risk for thyroid cancer, the results were inconsistent. In the present study, a systematic review and meta-analysis of prospective cohort studies was conducted to assess the impact of height on thyroid cancer risk. Online databases were searched up to December 30, 2014, for prospective cohort studies on the association between height and thyroid cancer risk. Pooled relative risks (RRs) and 95% confidence intervals (CIs) were calculated using a random-effects model of meta-analysis. In all, 11 articles were included in this meta-analysis, including 15 prospective cohort studies, containing 6,695,593 participants and 7,062 cases of thyroid cancer. By comparing the highest versus the lowest categories of height, we reported that risk of thyroid cancer was increased with height in both men (summary RR = 1.40, 95%CI 1.09-1.78, p = 0.008) and women (summary RR = 1.54, 95%CI 1.30-1.83, p < 0.001). The summary RR of thyroid cancer per 5-cm increase in height was 1.16 (95%CI 1.09-1.23, p < 0.001). The results were similar among men (per 5-cm increase RR = 1.13, 95%CI 1.03-1.23, p = 0.011) and women (per 5-cm increase RR = 1.18, 95%CI 1.10-1.27, p < 0.001). No obvious risk of publication bias was observed. Our meta-analysis provides strong evidence for a dose-response relationship between height and risk of thyroid cancer in both men and women.
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Affiliation(s)
- Zhaohai Jing
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Xu Hou
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Ying Liu
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Shengli Yan
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Robin Wang
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China.,Department of Medicine, Second Military Medical University, Shanghai, 200433, China
| | - Shihua Zhao
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Yangang Wang
- Department of Endocrinology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
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17
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Ma J, Huang M, Wang L, Ye W, Tong Y, Wang H. Obesity and risk of thyroid cancer: evidence from a meta-analysis of 21 observational studies. Med Sci Monit 2015; 21:283-91. [PMID: 25612155 PMCID: PMC4315628 DOI: 10.12659/msm.892035] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Several studies have evaluated the association between obesity and thyroid cancer risk. However, the results remain uncertain. In this study, we conducted a meta-analysis to assess the association between obesity and thyroid cancer risk. MATERIAL/METHODS Published literature from PubMed, EMBASE, Springer Link, Ovid, Chinese Wanfang Data Knowledge Service Platform, Chinese National Knowledge Infrastructure (CNKI), and Chinese Biology Medicine (CBM) were retrieved before 10 August 2014. We included all studies that reported adjusted risk ratios (RRs), hazard ratios (HRs) or odds ratios (ORs), and 95% confidence intervals (CIs) of thyroid cancer risk. RESULTS Thirty-two studies (n=12 620 676) were included in this meta-analysis. Obesity was associated with a significantly increased risk of thyroid cancer (adjusted RR=1.33; 95% CI, 1.24-1.42; I2=25%). In the subgroup analysis by study type, increased risk of thyroid cancer was found in cohort studies and case-control studies. In subgroup analysis by sex, both obese men and women were at significantly greater risk of thyroid cancer than non-obese subjects. When stratified by ethnicity, significantly elevated risk was observed in Caucasians and in Asians. In the age subgroup analysis, both young and old populations showed increased thyroid cancer risk. Subgroup analysis on smoking status showed that increased thyroid cancer risks were found in smokers and in non-smokers. In the histology subgroup analyses, increased risks of papillary thyroid cancer, follicular thyroid cancer, and anaplastic thyroid cancer were observed. However, obesity was associated with decreased risk of medullary thyroid cancer. CONCLUSIONS Our results indicate that obesity is associated with an increased thyroid cancer risk, except medullary thyroid cancer.
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Affiliation(s)
- Jie Ma
- Department of Laboratory Medicine, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
| | - Min Huang
- Department of Scientific Research and Education, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
| | - Li Wang
- Department of Laboratory Medicine, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
| | - Wei Ye
- Department of Laboratory Medicine, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
| | - Yan Tong
- Department of Laboratory Medicine, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
| | - Hanmin Wang
- Department of Stomatology, Hubei Xinhua Hospital, Wuhan, Hubei, China (mainland)
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