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Breast cancer

G Ursin1, L Bernstein, M C Pike

  • 1Department of Preventive Medicine, University of Southern California School of Medicine, Los Angeles 90033.

Cancer Surveys
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

Breast cancer incidence varies globally, with rising rates observed worldwide since 1960. Increases in Japan and Singapore are linked to risk factors, while some US and European increases may be due to screening.

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Area of Science:

  • Epidemiology
  • Oncology
  • Global Health

Background:

  • Breast cancer incidence shows significant international variation, with lower rates in Asia and higher rates in Western countries.
  • Global breast cancer incidence has steadily increased since 1960.

Purpose of the Study:

  • To analyze changes in breast cancer incidence and mortality rates between 1955 and 1990.
  • To examine these changes across four age groups in 11 representative countries.

Main Methods:

  • Comparative analysis of incidence and mortality data from 1955-1990.
  • Inclusion of data from diverse countries including USA, Japan, India, China, and Singapore.
  • Stratification of data by age groups (35-44, 45-54, 55-64, 65-74).

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Main Results:

  • Significant increases in incidence were noted in Japan and Singapore, with Japan's rates for younger women doubling.
  • Mortality rates remained stable in the USA, England, and Norway, but increased by 50-60% in Japan, Singapore, and Hungary.
  • Artefactual increases due to screening were suggested for some Western countries, while risk factor changes were implicated elsewhere.

Conclusions:

  • Breast cancer incidence is rising globally, with varying contributing factors.
  • Screening practices may explain some incidence increases in developed nations.
  • Changes in known and suspected risk factors are likely driving the majority of incidence increases outside Western Europe and North America.