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Recent Improvement in the Long-term Survival of Breast Cancer Patients by Age and Stage in Japan
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- Yoshimura Akiyo
- Division of Molecular and Clinical Epidemiology, Aichi Cancer Research Institute Department of Breast Oncology, Aichi Cancer Center Hospital Department of Epidemiology, Nagoya University Graduate School of Medicine
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- Ito Hidemi
- Division of Molecular and Clinical Epidemiology, Aichi Cancer Research Institute Department of Epidemiology, Nagoya University Graduate School of Medicine Division of Epidemiology & Prevention, Aichi Cancer Research Institute
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- Nishino Yoshikazu
- Department of Epidemiology and Public Health, Kanazawa Medical University
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- Hattori Masakazu
- Department of Cancer Therapy Center, Fukui Prefectural Hospital
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- Matsuda Tomohiro
- Cancer Information Services and Surveillance Division, Center for Cancer Control and Information Services, National Cancer Center
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- Miyashiro Isao
- Department of Cancer Strategy, Cancer Control Center, Osaka International Cancer Institute
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- Nakayama Tomio
- Department of Cancer Epidemiology, Cancer Control Center, Osaka International Cancer Institute
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- Iwata Hiroji
- Department of Breast Oncology, Aichi Cancer Center Hospital
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- Matsuo Keitaro
- Division of Molecular and Clinical Epidemiology, Aichi Cancer Research Institute Department of Epidemiology, Nagoya University Graduate School of Medicine
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- Tanaka Hideo
- Division of Epidemiology & Prevention, Aichi Cancer Research Institute
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- Ito Yuri
- Department of Cancer Epidemiology, Cancer Control Center, Osaka International Cancer Institute
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Description
<p>Background: 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.</p><p>Methods: 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).</p><p>Results: 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% vs 88.6%), localized disease (+1.1%; 92.6% vs 93.7%) and distant metastasis (+0.9%; 13.8% vs 14.7%).</p><p>Conclusions: These population-based cancer registry data show that 10-year relative survival improved 2.4% over this period in Japan. By age and stage, improvement in the age 15–34 years and distant metastasis was very small, which suggests the need for new therapeutic strategies in these patients.</p>
Journal
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- Journal of Epidemiology
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Journal of Epidemiology 28 (10), 420-427, 2018-10-05
Japan Epidemiological Association
