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Shen Y, Xia J, Yi C, Li T, Wang P, Dai L, Shi J, Wang K, Sun C, Ye H. The association between circulating 25-hydroxyvitamin D and pancreatic cancer: a systematic review and meta-analysis of observational studies. Eur J Nutr 2024; 63:653-672. [PMID: 38170272 DOI: 10.1007/s00394-023-03302-w] [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: 02/21/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024]
Abstract
PURPOSE The relationship between circulating 25-hydroxyvitamin D [25(OH)D] and pancreatic cancer has been well studied but remains unclear. The purpose of this study was to elucidate the association between circulating 25(OH)D and pancreatic cancer by using a meta-analytic approach. METHODS PubMed, Embase, and Wed of Science databases were searched through October 15, 2022. A random or fixed-effects model was used to estimate the pooled odds ratio (OR), risk ratio (RR), hazard ratio (HR) and their 95% confidence intervals (CIs). RESULTS A total of 16 studies including 529,917 participants met the inclusion criteria, of which 10 reported incidence and 6 reported mortality. For the highest versus lowest categories of circulating 25(OH)D, the pooled OR of pancreatic cancer incidence in case-control studies was 0.98 (95% CI 0.69-1.27), and the pooled HRs of pancreatic cancer mortality in cohort and case-control studies were 0.64 (95% CI 0.45-0.82) and 0.78 (95% CI 0.62-0.95), respectively. The leave-one-out sensitivity analyses found no outliers and Galbraith plots indicated no substantial heterogeneity. CONCLUSION Evidence from this meta-analysis suggested that high circulating 25(OH)D levels may be associated with decreased mortality but not incidence of pancreatic cancer. Our findings may provide some clues for the treatment of pancreatic cancer and remind us to be cautious about widespread vitamin D supplementation for the prevention of pancreatic cancer.
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Affiliation(s)
- Yajing Shen
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
| | - Junfen Xia
- Office of Health Care, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Chuncheng Yi
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
| | - Tiandong Li
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
| | - Peng Wang
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
| | - Liping Dai
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Jianxiang Shi
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Keyan Wang
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Changqing Sun
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China
- School of Nursing and Health, Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Hua Ye
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, Henan, China.
- State Key Laboratory of Esophageal Cancer Prevention and Treatment and Henan Key Laboratory of Tumor Epidemiology, Zhengzhou, 450052, Henan, China.
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Öberg J, Jorde R, Almås B, Nielsen CS, Gerds TA, Cashman KD, Grimnes G. Vitamin D Status During Adolescence and the Impact of Lifestyle Changes: 2 Years' Follow-up From the Fit Futures Study. J Clin Endocrinol Metab 2024; 109:e1029-e1039. [PMID: 37955862 PMCID: PMC10876399 DOI: 10.1210/clinem/dgad655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/29/2023] [Accepted: 11/09/2023] [Indexed: 11/14/2023]
Abstract
CONTEXT Longitudinal data regarding vitamin D status in adolescence is scarce. This study presents population-based data from an Arctic adolescent population (n = 589) at 16 and 18 years. OBJECTIVE The aims of this study were to investigate changes in vitamin D status during 2 years in adolescence, and whether lifestyle changes were associated with serum 25-hydroxyvitamin D (s-25(OH)D) at follow-up. METHODS Fit Futures is a longitudinal study at 69°N in Norway. Participants had their s-25(OH)D levels analyzed in their first and third year of upper secondary school (median age 16 and 18 years), in Fit Futures 1 (FF1) and Fit Futures 2 (FF2), respectively. Self-reported lifestyle habits were registered through questionnaires. The association between lifestyle changes and s-25(OH)D levels at follow-up were calculated by regression analyses, controlling for baseline s-25(OH)D levels. RESULTS Longitudinal data were available for 309 girls and 280 boys. The proportion of adolescents with s-25(OH)D <50 nmol/L were 73.7% in FF1 and 77.1% in FF2, while the proportion <30 nmol/L constituted 35.7% in FF1 and 40.9% in FF2. Of those with s-25(OH)D <30 nmol/L (severe vitamin D deficiency) in FF1, 73.3% remained severely deficient in FF2. Among boys, an increase in UV exposure was significantly associated with higher s-25(OH)D levels in FF2 (beta; CI [nmol/L] 12.9; 9.1, 16.7). In girls, decreased vitamin/mineral supplement intake was significantly associated with lower s-25(OH)D at FF2 (-6.7; -10.2, -3.1), while increased UV (10.8; 7.0, 14.7) and combined hormonal contraceptive exposure (12.1; 6.0, 18.1) in FF2 was significantly associated with higher s-25(OH)D levels in FF2. CONCLUSION Severe vitamin D deficiency was prevalent throughout adolescence. Lifestyle changes may alter s-25(OH)D levels in this age group.
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Affiliation(s)
- Johanna Öberg
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Rolf Jorde
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Bjørg Almås
- Haukeland University Hospital, The Hormone Laboratory, N-5021 Bergen, Norway
| | - Christopher Sivert Nielsen
- Department of Chronic Diseases, Norwegian Institute of Public Health, N-0213 Oslo, Norway
- Department of Pain Management and Research, Oslo University Hospital, N-0318 Oslo, Norway
| | | | - Kevin D Cashman
- Cork Centre for Vitamin D and Nutrition Research, School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Guri Grimnes
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
- Division of Internal Medicine, University Hospital of North Norway, N-9038 Tromsø, Norway
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Harse JD, Marriott RJ, Zhu K, Murray K, Bucks RS. Vitamin D status and cognitive performance in community-dwelling adults: A dose-response meta-analysis of observational studies. Front Neuroendocrinol 2023:101080. [PMID: 37268277 DOI: 10.1016/j.yfrne.2023.101080] [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: 09/30/2022] [Revised: 05/27/2023] [Accepted: 05/27/2023] [Indexed: 06/04/2023]
Abstract
Low vitamin D status is linked with poorer cognition in adults while findings in relation to high levels are mixed.We performed a systematic review and meta-analyses to examine dose-response associations between 25-hydroxyvitamin D (25OHD) levelsand cognitive performance in community-dwelling adults. Thirty-eight observational studies were included in dose-response meta-analyses. Positive, nonlinear associations were identified between baseline25OHD levels and global cognition incross-sectional and longitudinal analyses, and for performance in memory and executive function in longitudinal analyses. When restricted to studies involving older adults, thepattern emerged forspecific domains in cross-sectional analyses. Poorer performance was associated with low 25OHD levels, while a sharp improvement was associated withlevels up to 60-70 nM/L. Further improvement was observed only for longitudinal global cognition. Our findings support the association between low vitamin D and poorer cognition and suggest levels of at least 60 nM/L are associated with better cognition during ageing.
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Affiliation(s)
- Janis D Harse
- School of Population and Global Health, University of Western Australia, Crawley, Western Australia.
| | - Ross J Marriott
- School of Population and Global Health, University of Western Australia, Crawley, Western Australia
| | - Kun Zhu
- Department of Endocrinology and Diabetes, Sir Charles Gairdner Hospital, Nedlands, Western Australia; Medical School, University of Western Australia, Crawley, Western Australia
| | - Kevin Murray
- School of Population and Global Health, University of Western Australia, Crawley, Western Australia
| | - Romola S Bucks
- School of Psychological Science, University of Western Australia, Crawley, Western Australia
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Allaoui G, Rylander C, Fuskevåg OM, Averina M, Wilsgaard T, Brustad M, Jorde R, Berg V. Longitudinal changes in vitamin D concentrations and the association with type 2 diabetes mellitus: the Tromsø Study. Acta Diabetol 2023; 60:293-304. [PMID: 36456716 PMCID: PMC9852201 DOI: 10.1007/s00592-022-02001-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 10/30/2022] [Indexed: 12/03/2022]
Abstract
AIM We aimed to investigate the relationship between pre- and post-diagnostic 25-hydroxyvitamin D (25(OH)D) concentrations and type 2 diabetes (T2DM) over a period of 30 years in individuals who developed T2DM compared to healthy controls. METHODS This case-control study included 254 participants with blood samples collected at five different time-points (T1-T5) between 1986 and 2016. Of the 254 participants, 116 were diagnosed with T2DM between T3 and T4, and were considered cases; the remaining 138 were controls. Linear mixed regression models were used to examine pre- and post-diagnostic changes in 25(OH)D concentrations, and logistic regression was used to examine associations between these concentrations and T2DM at each time-point. RESULTS 25(OH)D concentrations at different time-points and the longitudinal change in concentrations differed between cases and controls, and by sex. For women, each 5-nmol/l increase in 25(OH)D concentrations was inversely associated with T2DM at T3 (odds-ratio, OR, 0.79), whereas for men, this same increase was positively associated with T2DM at T1 (OR 1.12). Cases experienced a significant decrease in pre-diagnostic 25(OH)D concentrations (p value < 0.01 for women, p value = 0.02 for men) and a significant increase in post-diagnostic 25(OH)D concentrations (p value < 0.01 for women, p value = 0.01 for men). As such, each 1-unit increase in month-specific z-score change between T1 and T3 was significantly inversely associated with T2DM (OR 0.51 for women, OR 0.52 for men), and each such increase between T3 and T5 was significantly positively associated with T2DM in women (OR 2.48). CONCLUSIONS 25(OH)D concentrations seem to be affected by disease progression and type 2 diabetes diagnosis.
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Affiliation(s)
- Giovanni Allaoui
- Department of Laboratory Medicine, Diagnostic Clinic, University Hospital of North - Norway, 9038, Tromsø, Norway
- Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Charlotta Rylander
- Department of Community Medicine, Faculty of Health Sciences, UIT-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Ole-Martin Fuskevåg
- Department of Laboratory Medicine, Diagnostic Clinic, University Hospital of North - Norway, 9038, Tromsø, Norway
- Department of Clinical Medicine, Tromsø Endocrine Research Group, Uit-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Maria Averina
- Department of Laboratory Medicine, Diagnostic Clinic, University Hospital of North - Norway, 9038, Tromsø, Norway
- Department of Clinical Medicine, Tromsø Endocrine Research Group, Uit-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Tom Wilsgaard
- Department of Community Medicine, Faculty of Health Sciences, UIT-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Magritt Brustad
- Department of Community Medicine, Faculty of Health Sciences, UIT-The Arctic University of Norway, 9037, Tromsø, Norway
- The Public Dental Health Service Competence Centre of Northern Norway (TkNN), 9019, Tromsø, Norway
| | - Rolf Jorde
- Department of Clinical Medicine, Tromsø Endocrine Research Group, Uit-The Arctic University of Norway, 9037, Tromsø, Norway
| | - Vivian Berg
- Department of Laboratory Medicine, Diagnostic Clinic, University Hospital of North - Norway, 9038, Tromsø, Norway.
- Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9037, Tromsø, Norway.
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Maternal Passive Smoking, Vitamin D Deficiency and Risk of Spontaneous Abortion. Nutrients 2022; 14:nu14183674. [PMID: 36145050 PMCID: PMC9501103 DOI: 10.3390/nu14183674] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/01/2022] [Accepted: 09/04/2022] [Indexed: 12/02/2022] Open
Abstract
Background: Maternal passive smoking and vitamin D deficiency might elevate risk of spontaneous abortion. The study aimed to investigate the association of co-exposure to passive smoking and vitamin D deficiency with the risk of spontaneous abortion. Methods: A population-based case-control study was performed among non-smoking women in Henan Province, China, with 293 spontaneous abortion cases and 496 liveborn controls with term, normal birthweight. Results: Compared to women without exposure to passive smoking nor vitamin D deficiency, women with deficient vitamin D alone and women with exposure to passive smoking alone had increased risk of spontaneous abortion (OR = 1.76, 95%CI: 1.08~2.89; OR = 1.73, 95%CI: 1.11~2.69, respectively). The risk of spontaneous abortion was even higher for those with co-exposure to passive smoking and vitamin D deficiency (OR = 2.50, 95%CI: 1.63~3.84). A dose-response relationship was found of an incremental risk of spontaneous abortion with rising numbers of exposures to passive smoking and vitamin D deficiency (p < 0.001). Conclusion: Co-exposure to passive smoking and vitamin D deficiency was associated with an elevated risk of spontaneous abortion, and the risk of spontaneous abortion rose with rising numbers of exposures. Intervention programs need to specifically target the vulnerable groups of pregnant women with both malnutrition and unfavorable environmental exposure.
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Lin S, Zhang Y, Jiang L, Li J, Chai J, Pei L, Shang X. Interactive Effects of Maternal Vitamin D Status and Socio-Economic Status on the Risk of Spontaneous Abortion: Evidence from Henan Province, China. Nutrients 2022; 14:nu14020291. [PMID: 35057472 PMCID: PMC8780117 DOI: 10.3390/nu14020291] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/04/2022] [Accepted: 01/07/2022] [Indexed: 02/01/2023] Open
Abstract
Background: Maternal vitamin D deficiency might generate adverse reproductive outcomes, and socio-economic inequalities in micronutrient-related diseases have often been found. This study aimed to explore the interactive effects of maternal vitamin D status and socio-economic status (SES) on risk of spontaneous abortion. Methods: A population-based case–control study was conducted including 293 women with spontaneous abortion and 498 control women in December 2009 and January, 2010 in Henan Province, China. Information on pregnancy outcomes, maternal demographic, lifestyle and exposure factors and blood samples were collected at the same time. Vitamin D deficiency was defined as 25(OH)D < 20 ng/mL. SES index was constructed with principal component analysis by aggregating women’s and their husbands’ education level and occupation, and household income and expenditure. Interactive effects were assessed on a multiplicative scale with ratio of the odds ratio (ROR). Results: Compared to those with high SES and vitamin D sufficiency, women with vitamin D deficiency and low SES index had an increased risk of spontaneous abortion (aOR: 1.99; 95% CI: 1.23–3.23). The ROR was 2.06 (95% CI: 1.04–4.10), indicating a significant positive multiplicative interaction. Conclusions: Maternal low SES may strengthen the effect of vitamin D deficiency exposure on spontaneous abortion risk in this Chinese population.
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Affiliation(s)
- Shiqi Lin
- Institute of Population Research and China Center on Population Health and Development, Peking University, Beijing 100871, China; (S.L.); (Y.Z.); (J.L.)
| | - Yuan Zhang
- Institute of Population Research and China Center on Population Health and Development, Peking University, Beijing 100871, China; (S.L.); (Y.Z.); (J.L.)
| | - Lifang Jiang
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou 450002, China; (L.J.); (J.C.)
| | - Jiajia Li
- Institute of Population Research and China Center on Population Health and Development, Peking University, Beijing 100871, China; (S.L.); (Y.Z.); (J.L.)
| | - Jian Chai
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou 450002, China; (L.J.); (J.C.)
| | - Lijun Pei
- Institute of Population Research and China Center on Population Health and Development, Peking University, Beijing 100871, China; (S.L.); (Y.Z.); (J.L.)
- Correspondence: (L.P.); (X.S.)
| | - Xuejun Shang
- Department of Andrology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
- Correspondence: (L.P.); (X.S.)
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25-Hydroxyvitamin D reference percentiles and the role of their determinants among European children and adolescents. Eur J Clin Nutr 2022; 76:564-573. [PMID: 34302130 PMCID: PMC8993686 DOI: 10.1038/s41430-021-00985-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 07/06/2021] [Accepted: 07/08/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND/OBJECTIVES To provide age- and sex-specific percentile curves of serum 25-hydroxyvitamin D (25(OH)D) by determinants from 3-<15 year-old European children, and to analyse how modifiable determinants influence 25(OH)D. SUBJECTS/METHODS Serum samples were collected from children of eight European countries participating in the multicenter IDEFICS/I.Family cohort studies. Serum 25(OH)D concentrations were analysed in a central lab by a chemiluminescence assay and the values from 2171 children (N = 3606 measurements) were used to estimate percentile curves using the generalized additive model for location, scale and shape. The association of 25(OH)D with time spent outdoors was investigated considering sex, age, country, parental education, BMI z score, UV radiation, and dietary vitamin D in regressions models. RESULTS The age- and sex-specific 5th and 95th percentiles of 25(OH)D ranged from 16.5 to 73.3 and 20.8 to 79.3 nmol/l in girls and boys, respectively. A total of 63% had deficient (<50 nmol/l), 33% insufficient (50-<75 nmol/l) and 3% sufficient (≥75 nmol/l) levels. 25(OH)D increased with increasing UV radiation, time spent outdoors, and vitamin D intake and slightly decreased with increasing BMI z score and age. The odds ratio (OR) for a non-deficient 25(OH)D status (reference category: deficient status) by one additional hour spent outdoors was 1.21, 95% CI [1.12-1.31], i.e., children who spent one more hour per day outdoors than other children had a 21% higher chance of a non-deficient than a deficient status. CONCLUSION A majority of children suffer from deficient 25(OH)D. UV radiation, outdoor time, and dietary vitamin D are important determinants of 25(OH)D.
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Hektoen HH, Robsahm TE, Stenehjem JS, Axcrona K, Babigumira R, Mondul AM, Gislefoss RE, Andreassen BK. Vitamin D and Vitamin D-binding protein and risk of bladder cancer: A nested case-control study in the Norwegian Janus Serum Bank Cohort. Cancer Med 2021; 10:4107-4116. [PMID: 34080787 PMCID: PMC8209600 DOI: 10.1002/cam4.3960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 12/24/2022] Open
Abstract
Background High circulating levels of vitamin D (25(OH)D) are suggested to reduce the risk of urinary bladder cancer (BC), but the evidence is weak, and several studies lack sufficient adjustment for potential confounders (e.g., smoking, body mass index (BMI), and physical activity). Moreover, few studies have investigated the role of vitamin D‐binding protein (DBP) in this context. We conducted a matched nested case–control study including 378 cases and 378 controls within the Norwegian population‐based Janus cohort, using serum collected 5–41 years prior to diagnosis, to study 25(OH)D and BC risk, by taking circulating DBP into account. Methods Cox regression models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs), for 25(OH)D, DBP, and the molar ratio of 25(OH)D:DBP, an estimate of unbound (free) 25(OH)D levels. We adjusted for smoking (status and pack‐years), BMI, physical activity, education and (mutually) for 25(OH)D and DBP. Restricted cubic splines were employed to examine nonlinear associations. Results High optimal levels of circulating 25(OH)D (≥100 nmol/L) (HR 0.35, 95% CI 0.19–0.64) were associated with decreased BC risk, when compared with insufficient concentrations (50–74 nmol/L). This association was less pronounced for optimal levels (75–99 nmol/L) (HR = 0.69, 95% CI 0.47–1.01). Moreover, estimated free 25(OH)D, was associated with decreased BC risk for molar ratio 17–21 (HR 0.66, 95% CI 0.44–0.97) and ≥22 (HR 0.50, 95% CI 0.29–0.82), compared to molar ratio 11–16. The HR function for BC risk was not linear, rather reversed u‐shaped, with the highest HR at 62.5 nmol/L and 13.5 molar ratio, respectively. Conclusion High levels of total and estimated free 25(OH)D were associated with reduced risk of BC, compared with insufficient concentrations. DBP was not associated with BC risk. We did not observe any impact of DBP or any of the studied lifestyle factors on the association between 25(OH)D and BC.
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Affiliation(s)
- Helga H Hektoen
- Department of Research, Cancer Registry of Norway, Oslo, Norway
| | - Trude E Robsahm
- Department of Research, Cancer Registry of Norway, Oslo, Norway
| | - Jo S Stenehjem
- Department of Research, Cancer Registry of Norway, Oslo, Norway.,Department of Biostatistics, Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Oslo, Norway
| | - Karol Axcrona
- Department of Urology, Akershus University Hospital, Lørenskog, Norway
| | | | - Alison M Mondul
- Department of Epidemiology, University of Michigan, School of Public Health, Ann Arbor, MI, USA
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