scholarly journals Reply to ‘Comment on ‘The impact of vitamin D pathway genetic variation and circulating 25-hydroxyvitamin D on cancer outcome: systematic review and meta-analysis’’

2017 ◽  
Vol 117 (2) ◽  
pp. e4-e4
Author(s):  
L Zgaga ◽  
P G Vaughan-Shaw ◽  
F O’Sullivan ◽  
S M Farrington ◽  
E Theodoratou ◽  
...  
Keyword(s):  
Systematic Review ◽  
Vitamin D ◽  
Genetic Variation ◽  
Meta Analysis ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D ◽  
Cancer Outcome ◽  
The Impact

scholarly journals The impact of vitamin D pathway genetic variation and circulating 25-hydroxyvitamin D on cancer outcome: systematic review and meta-analysis

2017 ◽  
Vol 116 (8) ◽  
pp. 1092-1110 ◽  
Author(s):  
P G Vaughan-Shaw ◽  
F O'Sullivan ◽  
S M Farrington ◽  
E Theodoratou ◽  
H Campbell ◽  
...  
Keyword(s):  
Systematic Review ◽  
Vitamin D ◽  
Genetic Variation ◽  
Meta Analysis ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D ◽  
Cancer Outcome ◽  
The Impact

scholarly journals Vitamin D and Type 1 Diabetes Risk: A Systematic Review and Meta-Analysis of Genetic Evidence

Nutrients ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 4260
Author(s):  
Liana Najjar ◽  
Joshua Sutherland ◽  
Ang Zhou ◽  
Elina Hyppönen
Keyword(s):  
Systematic Review ◽  
Vitamin D ◽  
Type 1 Diabetes ◽  
Meta Analysis ◽  
Low Frequency ◽  
Nucleotide Polymorphisms ◽  
Hydroxyvitamin D ◽  
Quantitative Synthesis ◽  
25 Hydroxyvitamin D

Several observational studies have examined vitamin D pathway polymorphisms and their association with type 1 diabetes (T1D) susceptibility, with inconclusive results. We aimed to perform a systematic review and meta-analysis assessing associations between selected variants affecting 25-hydroxyvitamin D [25(OH)D] and T1D risk. We conducted a systematic search of Medline, Embase, Web of Science and OpenGWAS updated in April 2021. The following keywords “vitamin D” and/or “single nucleotide polymorphisms (SNPs)” and “T1D” were selected to identify relevant articles. Seven SNPs (or their proxies) in six genes were analysed: CYP2R1 rs10741657, CYP2R1 (low frequency) rs117913124, DHCR7/NADSYN1 rs12785878, GC rs3755967, CYP24A1 rs17216707, AMDHD1 rs10745742 and SEC23A rs8018720. Seven case-control and three cohort studies were eligible for quantitative synthesis (n = 10). Meta-analysis results suggested no association with T1D (range of pooled ORs for all SNPs: 0.97–1.02; p > 0.01). Heterogeneity was found in DHCR7/NADSYN1 rs12785878 (I2: 64.8%, p = 0.02). Sensitivity analysis showed exclusion of any single study did not alter the overall pooled effect. No association with T1D was observed among a Caucasian subgroup. In conclusion, the evidence from the meta-analysis indicates a null association between selected variants affecting serum 25(OH)D concentrations and T1D.

Association Between Vitamin D and Risk of Colorectal Cancer: A Systematic Review of Prospective Studies

2011 ◽  
Vol 29 (28) ◽  
pp. 3775-3782 ◽  
Author(s):  
Yanlei Ma ◽  
Peng Zhang ◽  
Feng Wang ◽  
Jianjun Yang ◽  
Zhihua Liu ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Systematic Review ◽  
Rectal Cancer ◽  
Vitamin D ◽  
Prospective Studies ◽  
Meta Analysis ◽  
Blood Levels ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D

Purpose To conduct a systematic review of prospective studies assessing the association of vitamin D intake or blood levels of 25-hydroxyvitamin D [25(OH)D] with the risk of colorectal cancer using meta-analysis. Methods Relevant studies were identified by a search of MEDLINE and EMBASE databases before October 2010 with no restrictions. We included prospective studies that reported relative risk (RR) estimates with 95% CIs for the association between vitamin D intake or blood 25(OH)D levels and the risk of colorectal, colon, or rectal cancer. Approximately 1,000,000 participants from several countries were included in this analysis. Results Nine studies on vitamin D intake and nine studies on blood 25(OH)D levels were included in the meta-analysis. The pooled RRs of colorectal cancer for the highest versus lowest categories of vitamin D intake and blood 25(OH)D levels were 0.88 (95% CI, 0.80 to 0.96) and 0.67 (95% CI, 0.54 to 0.80), respectively. There was no heterogeneity among studies of vitamin D intake (P = .19) or among studies of blood 25(OH)D levels (P = .96). A 10 ng/mL increment in blood 25(OH)D level conferred an RR of 0.74 (95% CI, 0.63 to 0.89). Conclusion Vitamin D intake and blood 25(OH)D levels were inversely associated with the risk of colorectal cancer in this meta-analysis.

scholarly journals Association Between Vitamin D Exposure and Head and Neck Cancer: A Systematic Review With Meta-Analysis

2021 ◽  
Vol 12 ◽  
Author(s):  
Yuting Pu ◽  
Gangcai Zhu ◽  
Yimin Xu ◽  
Siyuan Zheng ◽  
Bin Tang ◽  
...  
Keyword(s):  
Systematic Review ◽  
Vitamin D ◽  
Head And Neck Cancer ◽  
Head And Neck ◽  
Meta Analysis ◽  
Hydroxyvitamin D ◽  
Vitamin D Intake ◽  
25 Hydroxyvitamin D ◽  
High Concentrations

BackgroundVitamin D deficiency is a well-described preventable cause of many cancers; the association of vitamin D use with the development of head and neck cancer (HNC) is not clear. We aim to conduct a systematic review of the studies assessing the relation between vitamin D exposure and the prevention and prognosis of the HNC using meta-analysis.MethodsPubMed, EMBASE, Cochrane Library, Web of Science up to 1 January 2021, and reference lists of related studies were searched. We extracted observational studies reporting the association between vitamin D (vitamin D receptor gene polymorphisms, 25-hydroxyvitamin D concentrations, and vitamin D intake) and the outcomes of interest (HNC incidence and HNC mortality) in HNC patients aged 18 or older. Fixed effects models were used to calculate pooled effect sizes and 95% confidence intervals (CIs) by RevMan (version 5.3).ResultsSixteen studies with a total of 81,908 participants were enrolled in our meta-analysis. Based on the pooled genomic analysis, comparing with participants with the genotypes of Ff + FF or FF, the pooled odds ratio (OR) of participants with the genotype of ff was 0.77 (95% CI: 0.61 to 0.97) and 0.75 (0.58 to 0.97), respectively. A similar trend was noted when comparing tt with Tt + TT or TT, in which OR (95% CI) was 0.70 (0.55 to 0.90) and 0.72 (0.55 to 0.95). No significant association was identified between BsmI polymorphism and HNC. Furthermore, the OR of HNC incidence was 0.77 (0.65 to 0.92) for participants with vitamin D intake over the ones with a regular diet. High concentrations of circulated 25-hydroxyvitamin D (25-OHD) significantly decreased by 32% of HNC incidence (OR (95% CI): 0.68 (0.59 to 0.78)) and increased HNC survival (pooled hazard ratio 1.13, 1.05 to 1.22) during a 4–5 years follow-up. High concentrations of circulating 25-OHD in patients with HNC led to a decreased risk of mortality to 0.75 (0.60 to 0.94) as the follow-up extends to 8–12 years.ConclusionsElevated activities of vitamin D by diet intake, genomic polymorphisms, or circulated 25-OHD may protect people from HNC and improve the prognosis of patients with HNC.Systematic Review RegistrationPROSPERO, identifier CRD42020176002 (https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID=176002).

scholarly journals The Role of Vitamin D in The Age of COVID-19: A Systematic Review and Meta-Analysis

2020 ◽  
Author(s):  
Roya Ghasemian ◽  
Amir Shamshirian ◽  
Keyvan Heydari ◽  
Mohammad Malekan ◽  
Reza Alizadeh-Navaei ◽  
...  
Keyword(s):  
Systematic Review ◽  
Chronic Kidney Disease ◽  
Vitamin D ◽  
Cardiovascular Diseases ◽  
Vitamin D Deficiency ◽  
Respiratory Diseases ◽  
Meta Analysis ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D

AbstractBackgroundEvidence recommends that vitamin D might be a crucial supportive agent for the immune system, mainly in cytokine response regulation against COVID-19. Hence, we carried out a systematic review and meta-analysis in order to maximize the use of everything that exists about the role of vitamin D in the COVID-19.MethodsA systematic search was performed in PubMed, Scopus, Embase, Cochrane Library, Web of Science, and Google Scholar (intitle) as well as preprint database of medRxiv, bioRxiv, Research Square, preprints.org, and search engine of ScienceDirect up to October 10, 2020. Studies focused on the role of vitamin D in confirmed COVID-19 patients were entered into the systematic review.ResultsSixteen studies containing 4922 participants entered into the meta-analysis. The meta-analysis indicated that 48% of COVID-19 patients were suffering from vitamin D deficiency (95% CI, 29%-67%), and in 41% of patients, levels of vitamin D were insufficient (95% CI, 10%-82%). The serum 25-hydroxyvitamin D concentration was 18 ng/mL among all COVID-19 patients (95% CI, 13-24). Co-morbidities frequency in COVID-19 patients were as follows: 7.4% cancer, 27.1% chronic kidney disease, 30.4% cardiovascular diseases, 5.1% dementia, 14.5% depression/anxiety, 32.1% diabetes, 47.4% hypertension, 22.0% obesity and 17.5% respiratory diseases. Reported ethnic groups in studies were 1.0% Afro-Caribbean, 10.3% Asian, and 92.1% Caucasian.ConclusionThis study found that the mean serum 25-hydroxyvitamin D level was low in all COVID-19 patients, and most of them were suffering from vitamin D deficiency/insufficiency. The Caucasian was the dominant ethnic group, and the most frequent co-morbidities in COVID-19 patients were hypertension, cardiovascular diseases, chronic kidney disease, diabetes, obesity, and respiratory diseases, which might be affected by vitamin D deficiency directly or indirectly.

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