Recent Improvement in the Long-term Survival of Breast Cancer Patients by Age and Stage in Japan

Journal of Epidemiology
Akiyo YoshimuraYuri Ito

Abstract

Recent improvements in 5-year survival of breast cancer have been reported in Japan and other countries. Though the number of long-term breast cancer survivors has been increasing, recent improvements in 10-year survival have not been reported. Moreover, the degree of improvement according to age and disease stage remains unclear. We calculated long-term survival using data on breast cancer diagnosed from 1993 through 2006 from six prefectural population-based cancer registries in Japan. The recent increase in 10-year relative survival was assessed by comparing the results of period analysis in 2002-2006 with the results of cohort analysis in 1993-1997. We also conducted stratified analyses by age group (15-34, 35-49, 50-69, and 70-99 years) and disease stage (localized, regional, and distant). A total of 63,348 patients were analysed. Ten-year relative survival improved by 2.4% (76.9% vs 79.3%) from 1993 through 2006. By age and stage, 10-year relative survival clearly improved in the age 35-49 years (+2.9%; 78.1% vs 81.0%), 50-69 years (+2.8%; 75.2% vs 78.0%) and regional disease (+3.4%; 64.9% vs 68.3%). In contrast, the degree of improvement was small in the age 15-34 years (+0.1%; 68.2% vs 68.3%), 70-99 years (+1.0%; 87.6% ...Continue Reading

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Citations

Nov 26, 2019·Journal of Adolescent and Young Adult Oncology·Danny R YouldenJoanne F Aitken
Apr 15, 2019·The Breast Journal·Agnieszka KołacińskaAndrzej Śliwczyński
Jul 5, 2021·Clinical Imaging·Anna StarikovElizabeth Kagan Arleo
Jul 20, 2021·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Faranak JelvehzadehHadi Ranjbar

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