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Yiallourou A, Pantavou K, Markozannes G, Pilavas A, Georgiou A, Hadjikou A, Economou M, Christodoulou N, Letsos K, Khattab E, Kossyva C, Constantinou M, Theodoridou M, Piovani D, Tsilidis KΚ, Bonovas S, Nikolopoulos GK. Non-genetic factors and breast cancer: an umbrella review of meta-analyses. BMC Cancer 2024; 24:903. [PMID: 39061008 PMCID: PMC11282738 DOI: 10.1186/s12885-024-12641-8] [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: 04/05/2024] [Accepted: 07/15/2024] [Indexed: 07/28/2024] Open
Abstract
BACKGROUND Previous research has found associations between various non-genetic factors and breast cancer (BrCa) risk. This study summarises and appraises the credibility of the available evidence on the association between non-genetic factors and BrCa risk. METHODS We conducted an umbrella review of meta-analyses. Medline, Scopus, and the Cochrane databases were systematically searched for meta-analyses examining non-genetic factors and BrCa incidence or mortality. The strength of the evidence was graded in four categories (i.e., weak, suggestive, highly suggestive, convincing). RESULTS A total of 781 meta-analyses from 280 publications were evaluated and graded. We included exposures related to anthropometric measurements, biomarkers, breast characteristics and diseases, diet and supplements, environment, exogenous hormones, lifestyle and social factors, medical history, medication, reproductive history, and pregnancy. The largest number of examined associations was found for the category of diet and supplements and for exposures such as aspirin use and active smoking. The statistically significant (P-value < 0.05) meta-analyses were 382 (49%), of which 204 (53.4%) reported factors associated with increased BrCa risk. Most of the statistically significant evidence (n = 224, 58.6%) was graded as weak. Convincing harmful associations with heightened BrCa risk were found for increased body mass index (BMI), BMI and weight gain in postmenopausal women, oral contraceptive use in premenopausal women, increased androstenedione, estradiol, estrone, and testosterone concentrations, high Breast Imaging Reporting and Data System (BIRADS) classification, and increased breast density. Convincing protective factors associated with lower BrCa risk included high fiber intake and high sex hormone binding globulin (SHBG) levels while highly suggestive protective factors included high 25 hydroxy vitamin D [25(OH)D] levels, adherence to healthy lifestyle, and moderate-vigorous physical activity. CONCLUSIONS Our findings suggest some highly modifiable factors that protect from BrCa. Interestingly, while diet was the most studied exposure category, the related associations failed to reach higher levels of evidence, indicating the methodological limitations in the field. To improve the validity of these associations, future research should utilise more robust study designs and better exposure assessment techniques. Overall, our study provides knowledge that supports the development of evidence-based BrCa prevention recommendations and guidance, both at an individual level and for public health initiatives. TRIAL REGISTRATION PROSPERO CRD42022370675.
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Affiliation(s)
- Anneza Yiallourou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | - Katerina Pantavou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | - Georgios Markozannes
- Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, SW7 2AZ, UK
- Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, 45110, Greece
| | - Antonis Pilavas
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | - Andrea Georgiou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | - Andria Hadjikou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | - Mary Economou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | | | | | - Elina Khattab
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | | | - Maria Constantinou
- Medical School, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus
| | | | - Daniele Piovani
- Department of Biomedical Sciences, Humanitas University, Milan, 20072, Italy
- IRCCS Humanitas Research Hospital, Milan, 20089, Italy
| | - Konstantinos Κ Tsilidis
- Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, SW7 2AZ, UK
- Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, 45110, Greece
| | - Stefanos Bonovas
- Department of Biomedical Sciences, Humanitas University, Milan, 20072, Italy
- IRCCS Humanitas Research Hospital, Milan, 20089, Italy
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Veisi P, Nikouei M, Cheraghi M, Shahgheibi S, Moradi Y. The association between the multiple birth and breast cancer incidence: an update of a systematic review and meta-analysis from 1983 to 2022. Arch Public Health 2023; 81:76. [PMID: 37106433 PMCID: PMC10142199 DOI: 10.1186/s13690-023-01089-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND It has been assumed that perinatal factors such as multiple pregnancies may affect subsequent breast cancer risk in the mother. Considering the inconsistencies in the results of case-control and cohort studies published in the world, this meta-analysis was conducted in order to determine the exact association between multiple pregnancies (twins or more) and the breast cancer incidence. METHODS This study was performed as a meta-analysis based on PRISMA guidelines by searching the international databases of PubMed (Medline), Scopus, and Web of Science as well as by screening selected articles based on their subject, abstract and full text. The search time was from January 1983 to November 2022. Then the NOS checklist was used to evaluate the quality of the final selected articles. The indicators considered for the meta-analysis included the odds ratio (OR) and the risk ratio (RR) along with the confidence interval reported in the selected primary studies. The desired analyzes were performed with STATA software version 17 to be reported. RESULTS In this meta-analysis, 19 studies were finally selected for analysis, which fully met the inclusion criteria. Of these, 11 were case-control studies and 8 were cohort ones. Their sample size was 263,956 women (48,696 with breast cancer and 215,260 healthy) and 1,658,378 (63,328 twin or multiple pregnancies and 1,595,050 singleton pregnancies), respectively. After combining the results of cohort and case-control studies, the effect of multiple pregnancies on the breast cancer incidence was equal to 1.01 (95% CI: 0.89-1.14; I2: 44.88%, P: 0.06) and 0.89 (95% CI: 0.83-0.95; I2: 41.73%, P: 0.07), respectively. CONCLUSION The present meta-analysis results showed, in general, multiple pregnancies were one of the preventive factors of breast cancer.
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Affiliation(s)
- Pedram Veisi
- Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Maziar Nikouei
- Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Mojtaba Cheraghi
- Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran.
| | - Sholeh Shahgheibi
- Department of Obstetrics and Gynecology, School of Medicine, Besat Hospital, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Yousef Moradi
- Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran.
- Department of Epidemiology and Biostatistics, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
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Maternal circulating angiogenic factors in twin and singleton pregnancies. Am J Obstet Gynecol 2015; 212:636.e1-8. [PMID: 25434840 DOI: 10.1016/j.ajog.2014.11.035] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/30/2014] [Accepted: 11/24/2014] [Indexed: 01/23/2023]
Abstract
OBJECTIVE The purpose of this study was to compare longitudinally sampled maternal angiogenic proteins between singleton and twin pregnancies. STUDY DESIGN Placental growth factor (PlGF), soluble feline McDonough sarcoma (fms)-like tyrosine kinase (sFlt)-1, and soluble endoglin from healthy pregnant women were quantified at 10, 18, 26, and 35 weeks' gestation (n=91), and during the third trimester (31-39 weeks) and at delivery (33-41 weeks; n=41). Geometric means and 95% confidence intervals were calculated for gestational age-adjusted angiogenic protein concentrations and compared between matched twin and singleton pregnancies. RESULTS Maternal sFlt-1 concentrations and the sFlt-1/PlGF ratio were higher in twins than singletons across pregnancy and at delivery, with the greatest differences at week 35 (sFlt-1: 36,916 vs 10,151 pg/mL; P<.0001; sFlt-1/PlGF: 168.4 vs 29.0; P<.0001). Maternal concentrations of soluble endoglin also were higher in the third trimester and delivery. Maternal PlGF concentrations were lower in twin than singleton pregnancies at week 35 only (219.2 vs 350.2 pg/mL; P<.0001). Placental weight appeared to be inversely correlated with maternal sFlt-1/PlGF ratio at the end of pregnancy in both twins and singletons. CONCLUSION Higher maternal antiangiogenic proteins in twin than singleton pregnancies does not appear to be due to greater placental mass in the former, and may be one explanation for the increased risk of preeclampsia in women carrying multiple gestations. Determining whether women with a history of multiple gestations have an altered cardiovascular disease and breast cancer risk, like those with a history of preeclampsia, is warranted.
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