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Epidemiological Trends of Histopathologically WHO Classified CNS Tumors in Developing Countries: Systematic Review

  • Khan, Ishaq (Center of Excellence in Genomic Medicine, King Abdulaziz University) ;
  • Bangash, Mohammed (Division of Neurosurgery, King Abdulaziz University) ;
  • Baeesa, Saleh (Division of Neurosurgery, King Abdulaziz University) ;
  • Jamal, Awatif ;
  • Carracedo, Angel (Fundacion Galega de Medicina Xenomica (SERGAS), CIBERER-Universidade de Santiago de Compostela) ;
  • Alghamdi, Fahad ;
  • Qashqari, Hanadi (King Fahd Medical Research Center, King Abdulaziz University) ;
  • Abuzenadah, Adel (Centre of Innovation for Personalized Medicine, King Abdulaziz University) ;
  • AlQahtani, Mohammed (Center of Excellence in Genomic Medicine, King Abdulaziz University) ;
  • Damanhouri, Ghazi (King Fahd Medical Research Center, King Abdulaziz University) ;
  • Chaudhary, Adeel (Center of Excellence in Genomic Medicine, King Abdulaziz University) ;
  • Hussein, Deema (King Fahd Medical Research Center, King Abdulaziz University)
  • Published : 2015.02.04

Abstract

Background: Many developing countries are lagging behind in reporting epidemiological data for individual central nervous system (CNS) tumors. This paper aimed to elicit patterns for the epidemiology of individual World Health Organization (WHO) classified CNS tumors in countries registered by WHO as "developing". Materials and Methods: Cyber search was carried out through 66 cancer networks/registries and 181 PubMed published papers that reported counts of CNS tumors for the period of 2009-2012. The relationship between the natural log of incidence Age Standardized Rate (ASR) reported by Globocan and Latitude/ Longitude was investigated. Results: Registries for 21 countries displayed information related to CNS tumors. In contrast tends for classified CNS tumor cases were identified for 38 countries via 181 PubMed publications. Extracted data showed a majority of unclassified reported cases [PubMed (38 countries, 45.7%), registries (21 countries, 96.1%)]. For classified tumors, astrocytic tumors were the most frequently reported type [PubMed (38 countries, 1,245 cases, 15.7%), registries (21 countries, 627 cases, 1.99%]. A significant linear regression relationship emerged between latitudes and reported cases of CNS tumors. Conclusions: Previously unreported trends of frequencies for individually classified CNS tumors were elucidated and a possible link of CNS tumors occurrence with geographical location emerged.

Keywords

CNS tumors;epidemiology;developing countries;cancer registries;latitude;risk factors

Acknowledgement

Supported by : King Abdulaziz University

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