title: Incidence rate of non-Hodgkin's lymphomas among males in Saudi Arabia: an observational descriptive epidemiological analysis of data from the Saudi Cancer Registry, 2001-2008.
abstract: BACKGROUND
  This study describes epidemiological data of non-Hodgkin's lymphoma (NHL) diagnosed from 2001 to 2008 among Saudi men.
  
  
  METHODS
  Retrospective data from all NHL cancer cases among Saudi men recorded in the Saudi Cancer Registry (SCR) between January 2001 and December 2008 were used. Descriptive statistics, analysis of variance, Poisson regression, and simple linear regression were also used.
  
  
  RESULTS
  In total, 2,555 new cases of NHL were recorded between January 2001 and December 2008. The region of Riyadh, Saudi Arabia had the highest overall age-standardized incidence rate (ASIR) at 7.8, followed by the Eastern region at 6.8, and Makkah at 6.1 per 100,000 men; however, Jazan, Hail, and Baha had the lowest average ASIRs at 2.5, 3.7, and 3.9 per 100,000 men, respectively. The incidence-rate ratio for the number of NHL cases was significantly higher in Riyadh (4.68, 95% confidence interval [CI] 4.11-5.32), followed by Makkah (4.47, 95% CI 3.94-5.07), and the Eastern region of Saudi Arabia (3.27, 95% CI 2.90-3.69) than that in the reference region of Jazan. Jouf had the highest changes in the ASIRs of NHL among Saudi men from 2001 and 2008 (5.0 per 100,000 men).
  
  
  CONCLUSIONS
  A significant increase in the crude incidence rate and ASIR for NHL in Saudi Arabia between 2001 and 2008 was found. Riyadh, the Eastern region, and Makkah had the highest overall ASIR in Saudi Arabia. Jazan, Hail, and Baha had the lowest rates. Additionally, Riyadh, Makkah, and the Eastern region had the highest incidence-rate ratio for the number of NHL cases. Finally, Jouf had the highest changes in crude incidence rate and ASIR from 2001 to 2008. Further analytical studies are needed to determine the potential risk factors of NHL among Saudi men.
authors.affiliation: School of Life Sciences, University of Lincoln, Lincoln, UK ; Albaha University, Al Baha, Saudi Arabia.
authors.forename: Ibrahim G
authors.initials: IG
authors.lastname: Alghamdi
authors.affiliation: School of Life Sciences, University of Lincoln, Lincoln, UK.
authors.forename: Issam I
authors.initials: II
authors.lastname: Hussain
authors.affiliation: General Directorate of Health Affairs, Ministry of Health, Al Baha, Saudi Arabia.
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Alghamdi
authors.affiliation: King Fahad Specialist Hospital, Dammam, Saudi Arabia.
authors.forename: Ahlam A
authors.initials: AA
authors.lastname: Dohal
authors.affiliation: King Fahad Specialist Hospital, Dammam, Saudi Arabia.
authors.forename: Mansour M
authors.initials: MM
authors.lastname: Alghamdi
authors.affiliation: Research and Development, Lincoln Hospital, United Lincolnshire Hospitals NHSTrust, Lincoln, UK.
authors.forename: Mohammed A
authors.initials: MA
authors.lastname: El-Sheemy
keywords: Saudi Cancer Registry; age standardized incidence rate; cancer epidemiology; incidence rate; non-Hodgkin’s lymphomas