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Spatial Analysis of Common Gastrointestinal Tract Cancers in Counties of Iran

  • Soleimani, Ali (Department of Epidemiology, Research Center for Health Sciences, School of Health, Shiraz University of Medical Science) ;
  • Hassanzadeh, Jafar (Department of Epidemiology, Research Center for Health Sciences, School of Health, Shiraz University of Medical Science) ;
  • Motlagh, Ali Ghanbari (Non-Communicable Diseases, Deputy of Health, Ministry of Health and Medical Education-Cancer Research Center, Shahid Beheshti University of Medical Sciences) ;
  • Tabatabaee, Hamidreza (Department of Epidemiology, Research Center for Health Sciences, School of Health, Shiraz University of Medical Science) ;
  • Partovipour, Elham (Non-Communicable Diseases, Deputy of Health, Ministry of Health and Medical Education) ;
  • Keshavarzi, Sareh (Department of Epidemiology, Research Center for Health Sciences, School of Health, Shiraz University of Medical Science) ;
  • Hossein, Mohammad (Department of Epidemiology, Research Center for Health Sciences, School of Health, Shiraz University of Medical Science)
  • Published : 2015.05.18

Abstract

Background: Gastrointestinal tract cancers are among the most common cancers in Iran and comprise approximately 38% of all the reported cases of cancer. This study aimed to describe the epidemiology and to investigate spatial clustering of common cancers of the gastrointestinal tract across the counties of Iran using full Bayesian smoothing and Moran I Index statistics. Materials and Methods: The data of the national registry cancer were used in this study. Besides, indirect standardized rates were calculated for 371 counties of Iranand smoothed using Winbug 1.4 software with a full Bayesian method. Global Moran I and local Moran I were also used to investigate clustering. Results: According to the results, 75,644 new cases of cancer were nationally registered in Iran among which 18,019 cases (23.8%) were esophagus, gastric, colorectal, and liver cancers. The results of Global Moran's I test were 0.60 (P=0.001), 0.47 (P=0.001), 0.29 (P=0.001), and 0.40 (P=0.001) for esophagus, gastric, colorectal, and liver cancers, respectively. This shows clustering of the four studied cancers in Iran at the national level. Conclusions: High level clustering of the cases was seen in northern, northwestern, western, and northeastern areas for esophagus, gastric, and colorectal cancers. Considering liver cancer, high clustering was observed in some counties in central, northeastern, and southern areas.

Keywords

Spatial;epidemiology;clustering;cancer;Iran counties

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