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Cancer Causes & Control

, Volume 13, Issue 1, pp 65–71 | Cite as

Stage-specific incidence of breast cancer before the beginning of organized screening programs in Italy

  • Eva Buiatti
  • Alessandro Barchielli
  • Simone Bartolacci
  • Lauro Bucchi
  • Vincenzo De Lisi
  • Massimo Federico
  • Stefano Ferretti
  • Eugenio Paci
  • Marcello Vettorazzi
  • Roberto Zanetti
Article

Abstract

Objective: To measure stage-specific geographic and time variability of breast cancer in seven Italian areas before the onset of organized screening programs. Methods: All invasive cancers (8689 cases) arising in women aged 40–79 years during the pre-screening period 1985–1997, were considered. Multiple Poisson regression analysis was performed. Results: About 39% of the cases were classified as “early,” 52% as “advanced,” and 9% as “unspecified” stage. Age-adjusted incidence rates showed a significant geographic variation for early but not for advanced cancers (range: 58–103 cases/100,000 and 104–125 cases/100,000, respectively). The result was confirmed in the multiple regression analysis after adjustment for year of diagnosis and age. Early breast cancer risk adjusted for age and registry showed a significant increase over time (+ 3.9% per year for all ages, and + 6.2% per year for age category 50–79). In contrast, a decreasing time trend was observed for advanced cancer of 3 cm or over in women aged less than 60. Conclusions: In our study, early breast cancer incidence varied both by geographic area and time before the commencement of screening. The differences in early-stage incidence may well be related to differences in availability of “spontaneous” mammography. Late-stage incidence decreased over time in younger women and for very advanced cases, but not in the older ones, nor for cancers less than 3 cm. Early detection outside organized screening was only partially efficient in reducing advanced breast cancer incidence. The trend of incidence of advanced disease, as previously proposed, is confirmed to be a valid early indicator of effectiveness of screening.

breast cancer mammographic screening stage 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Eva Buiatti
    • 1
  • Alessandro Barchielli
    • 2
  • Simone Bartolacci
    • 3
  • Lauro Bucchi
    • 4
  • Vincenzo De Lisi
    • 5
  • Massimo Federico
    • 6
  • Stefano Ferretti
    • 7
  • Eugenio Paci
    • 8
  • Marcello Vettorazzi
    • 9
  • Roberto Zanetti
    • 10
  1. 1.Tuscany Regional Health AgencyAgenzia Regionale Sanità della ToscanaFlorenceItaly
  2. 2.Epidemiology Unit, ASL 10FlorenceItaly
  3. 3.uscany Regional Health AgencyItaly
  4. 4.Romagna Cancer RegistryItaly
  5. 5.Parma Cancer RegistryItaly
  6. 6.Modena Cancer RegistryItaly
  7. 7.Ferrara Cancer RegistryItaly
  8. 8.Tuscany Cancer RegistryItaly
  9. 9.Veneto Cancer RegistryItaly
  10. 10.Piedmont Cancer RegistryItaly

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