Plasma 25-hydroxyvitamin D levels, vitamin D intake, and pancreatic cancer risk or mortality: a meta-analysis
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Xi Zhang1,*, Xuan-Zhang Huang1,*, Wen-Jun Chen1, Jian Wu1, You Chen2, Cong-Cong Wu1 and Zhen-Ning Wang3
1Department of Chemotherapy and Radiotherapy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Lucheng, Wenzhou 325027, P.R. China
2Department of Pediatric Dentistry, The Wenzhou Dental Hospital, Lucheng, Wenzhou 325027, P.R. China
3Department of Surgical Oncology and General Surgery, The First Hospital of China Medical University, Heping, Shenyang 110001, P.R. China
*These authors have contributed equally to this work
Zhen-Ning Wang, email: [email protected]
Keywords: vitamin D, 25-hydroxyvitamin D, pancreatic cancer, risk, mortality
Received: February 14, 2017 Accepted: June 04, 2017 Published: June 29, 2017
Background: The associations between vitamin D status, including plasma 25-hydroxyvitamin D [25(OH)D] levels and vitamin D intake, and pancreatic cancer risk and mortality are inconsistent. The aims of this study are to evaluate the antitumor and therapeutic effects of vitamin D status for pancreatic cancer patients.
Methods: A literature search for relevant studies was conducted using PubMed and Embase databases. Risk ratio (RR), hazard ratio (HR), and 95% confidence interval (CI) were used as the effect measures. All statistical analyses were performed using Stata software 12.0.
Results: Our results indicated that high plasma 25(OH)D levels were inversely associated with pancreatic cancer mortality without significant heterogeneity (HR=0.81, 95% CI=0.68–0.96). However, high plasma 25(OH)D levels could not reduce pancreatic cancer risk (RR=1.02, 95% CI=0.66–1.57). Moreover, vitamin D intake was also not associated with pancreatic cancer risk (RR=1.11, 95% CI=0.67–1.86)
Conclusions: Our results indicate that high plasma 25(OH)D levels were significantly associated with improved survival in pancreatic cancer patients. However, there were no significant associations between vitamin D intake or plasma 25(OH)D levels and pancreatic cancer risk.
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