[Cancer epidemiology in Japan]

Area of Science:

• Oncology
• Epidemiology
• Public Health

Background:

• Cancer is Japan's leading cause of death since 1981, with increasing numbers and crude rates.
• The age-adjusted cancer death rate is stable in males and declining in females, attributed to an aging population.
• Stomach cancer incidence and mortality are decreasing, while rates for lung, biliary tract, pancreas, ovary, and prostate cancers are rising.

Purpose of the Study:

• To analyze trends in cancer incidence and mortality in Japan.
• To identify shifts in cancer patterns and compare them to Western countries.
• To review major cancer risk factors and emphasize primary prevention strategies.

Main Methods:

• Analysis of national cancer statistics and death rates.
• Review of epidemiological data on cancer incidence and mortality by site.
• Examination of potential contributing factors, including lifestyle and medical advancements.

Main Results:

• Cancer deaths and crude death rates are increasing, primarily due to population aging.
• Declining trends observed in stomach, cervical, liver, and esophageal cancers.
• Increasing trends noted for lung, biliary tract, pancreatic, ovarian, and prostate cancers, mirroring Western patterns.
• Smoking and diet identified as primary modifiable risk factors.

Conclusions:

• Japan's cancer profile is shifting towards Western patterns.
• Lifestyle modifications, including diet and smoking cessation, are crucial for primary cancer prevention.
• Continued monitoring and research are necessary to understand and address evolving cancer trends.