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[Prostatic cancer in Oslo--a real decline?]
Summary
Prostate cancer incidence is rising in Norway, but decreasing in Oslo, particularly in men over 70. This trend may be due to reduced autopsy diagnoses and potentially lower diagnostic intensity in Oslo.
Area of Science:
- Epidemiology
- Oncology
Context:
- Prostate cancer incidence has steadily increased in Norway since the 1950s.
- A contrasting decreasing trend has been observed in Oslo since the 1970s, specifically in individuals over 70 years of age.
Purpose:
- To investigate the unique trend of decreasing prostate cancer incidence in Oslo compared to the rest of Norway.
- To analyze changes in diagnostic practices and their potential impact on reported incidence rates.
Summary:
- The study highlights a significant decrease in prostate cancer cases first diagnosed at autopsy in Oslo, from 12.7% (1957-61) to 3.8% (1987-91).
- Even excluding autopsy-diagnosed cases, a slight downward incidence trend persists in Oslo, unlike other Norwegian regions.
- This pattern is not observed for other cancer types, suggesting region-specific factors influencing prostate cancer diagnosis.
Impact:
- Findings suggest a potential shift in diagnostic priorities or resource allocation in Oslo's healthcare system.
- The study prompts further research into the underlying causes of this localized incidence decrease, considering both diagnostic intensity and potential etiological factors.