International trends in prostatic cancer

Area of Science:

• Epidemiology
• Oncology
• Public Health

Background:

• Prostate cancer incidence and mortality show a 120-fold variation globally, with high rates in North America and Scandinavia, and low rates in East Asia.
• Geographic disparities exist, with highest reported mortality in certain Caribbean nations, though morbidity data is often unavailable.
• Both incidence and mortality rates for prostate cancer are increasing globally, particularly in regions with previously low frequencies.

Purpose of the Study:

• To analyze global variations in prostate cancer incidence and mortality rates.
• To investigate potential factors influencing the observed disparities, including diagnostic practices and the reporting of latent tumors.
• To highlight the need for standardized reporting and classification of prostate cancer to improve statistical comparability.

Main Methods:

• Analysis of available international data on prostate cancer incidence and mortality rates.
• Comparison of mortality-to-incidence ratios across different countries and regions.
• Review of factors potentially affecting statistical accuracy, such as diagnostic methods and the detection of latent prostatic carcinomas.

Main Results:

• Significant geographic variations in prostate cancer incidence and mortality were confirmed, with notable differences in mortality-to-incidence ratios.
• Lower mortality-to-incidence ratios were observed in North America, Hawaii, and Scandinavia.
• Increasing incidence trends in North America were not consistently matched by rising mortality, suggesting potential influences of diagnostic practices and treatment advances.

Conclusions:

• Variations in diagnostic practices and the inclusion of latent tumors in statistics contribute to the uncertainty in comparing global prostate cancer data.
• Advances in treatment may also play a role in improved survival rates observed in some regions.
• Standardizing the classification and reporting of prostate cancer, potentially by separating latent forms, is crucial for accurate international comparisons.