Epidemiological patterns of leukaemia in 184 countries: a population-based study

Area of Science:

• Epidemiology
• Oncology
• Global Health

Background:

• Leukaemia is a diverse group of blood cancers with distinct subgroups.
• Understanding global leukaemia burden is crucial for prevention and health planning.
• This study estimates global leukaemia incidence by major subtypes, age, and sex.

Purpose of the Study:

• To estimate the global burden of leukaemia incidence.
• To analyze incidence patterns for four major leukaemia subtypes.
• To stratify incidence by age and sex across different global regions.

Main Methods:

• Population-based study using Cancer Incidence in Five Continents Volume X (CI5-X) data (2003-2007).
• Extracted 2012 leukaemia incidence data from GLOBOCAN database for 184 countries.
• Calculated age-specific and age-standardized rates (ASRs) per 100,000 person-years, excluding registries with <100 cases or <80% microscopic verification.

Main Results:

• Included 717,863 cases (2003-2007); estimated over 350,000 new cases in 2012.
• Substantial regional variations observed; highest incidence in Australia/New Zealand, North America, and Western Europe; lowest in Western Africa.
• Rates generally higher in males (M:F ratio 1.4:1). Acute lymphoblastic leukaemia predominant in children; adult subtype distribution varied by region.

Conclusions:

• Geographical disparities in leukaemia incidence may be linked to healthcare access and resource levels.
• Aetiological factors, including gene-environment interactions, likely contribute to incidence patterns.
• The bimodal age-specific pattern suggests age-dependent risk factors, potentially including genetic components.