Introduction: Polyomaviruses including BK virus (BKV) and JC virus (JCV) are widespread in human and have been associated with colorectal cancer (CRC) in some studies. The aim of present systematic review and meta-analysis article is to calculate the pooled prevalence of BKV and JCV in patients with CRC and assessing their association with this malignancy. Materials and Methods: Domestic databases and Sciences Direct, PubMed, ProQuest, Web of Sciences and Scopus were searched for relevant articles up to 2nd June 2019Two independent reviewers extracted the related data from eligible articles. The pooled prevalence and pooled odds ratio (POR) and their 95% confidence interval (95% CI) were calculated using “metaprop” and “metan” commands in Stata 14. Where I2 statistics were >50%, the random effect model was used. Results: From 1461 relevant studies, 24 articles were eligible and included in the qualitative while 19 articles included in quantitative analysis. The pooled prevalence based on diagnostic methods varies from 29% using immunohistochemistry to 52% using nested-PCR method. The likelihood of being infected with JCV was significantly higher in CRC patients compared to healthy (POR: 4.41, 95% CI: 2.13 – 9.13) controls, normal adjacent mucosa (POR: 2.79, 95% CI: 1.3-5.9) and colorectal adenoma (POR: 3.1, 95% CI: 1.5-6.5) but was not significant when non-CRC patients used as control group. Conclusion: The prevalence of JCV in colorectal patients was substantially variable by different methods and targets. The significant association between JCV and CRC that was observed in the present study is not indicative of causation and should be studied more in large-scale prospective designs.
Background: Asthma is one of the most common chronic noncommunicable diseases which is seen more in the developed than developing countries of the world. Recurrence and exacerbations of the disease are common among patients and often lead to hospitalization and therapeutic interventions. Ambient air temperature might be related to the relapse of asthma. This review was conducted to investigate the relation between ambient temperature and exacerbations of asthma in children.Methods: Related articles were searched in PubMed, Web of Science, Science Direct, and Scopus databases with appropriate keywords and no specific limitation on October 1, 2018. Initially, the relevance of the articles was examined using the title and abstract. Out of 2633 articles, 23 articles were eligible according to the inclusion and exclusion criteria.Results: Fourteen studies had reported inverse relations; and showed as the temperature dropped, the number of asthma attacks increased in children. Nine papers observed a relation between hot weather and asthma attacks, 3 studies reported a relation between temperature differences and asthma attacks, and two studies did not show any relation. Some studies suggested the increased incidence of asthma in the 5-14 year old age group was associated with the start of the school year and probably due to the spread of viral diseases, not temperature changes. Conclusion:Extreme temperatures are likely to cause exacerbation of childhood asthma.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.