Evidence for increased susceptibility to breast cancer from exposure to ionizing radiation due to a familial history of breast cancer: Results from the Swedish hemangioma cohort.
    
    
        
    
    
        
        Am. J. Epidemiol. 190, 76-84 (2021)
    
    
    
      
      
	
	    Women with a history of breast cancer among family members are at increased risk for breast cancer. However, it is unknown whether a familial breast cancer history (FBCH) also increases individual susceptibility to breast cancer from radiation exposure. In this cohort study, 17,200 female Swedish hemangioma patients with 1,079 breast cancer cases diagnosed between 1958 and 2013, exposed to ionizing radiation in infancy, were linked to their first-degree relatives. The association between FBCH and radiation-induced breast cancer risk was assessed. Further, the relevance for breast cancer radiotherapy and mammography screening was evaluated. On average, the radiation-induced excess relative risk and excess absolute risk of breast cancer at age 50 years were 0.51 Gy(-1) (95% confidence interval (CI): 0.33, 0.71) and 10.8 cases/10,000 person-years/Gy (95% CI: 7.0, 14.6), respectively. Radiation risk was higher by a factor of 2.7 (95% CI: 1.0, 4.8; P = 0.05) if 1 first-degree relative was affected by breast cancer. For whole-breast standard radiotherapy at age 40 years with a contralateral breast dose of 0.72 Gy, the 20-year radiation-related excess risk of contralateral breast cancer was estimated to increase from 0.6% for women without FBCH to 1.7% for women with FBCH. In a biennial mammography screening program at ages 40-74 years, radiation risk up to age 80 years would increase from 0.11% for women without FBCH to 0.29% for women with FBCH.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Breast Cancer ; Breast Cancer Risk ; Familial Breast Cancer History ; Ionizing Radiation ; Radiation Epidemiology; Contralateral Breast; Radiotherapy; Risk; Landscape; Radium
    
 
    
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        Language
        english
    
 
    
        Publication Year
        2021
    
 
    
        Prepublished in Year
        2020
    
 
    
        HGF-reported in Year
        2020
    
 
    
    
        ISSN (print) / ISBN
        0002-9262
    
 
    
        e-ISSN
        1476-6256
    
 
    
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	    Volume: 190,  
	    Issue: 1,  
	    Pages: 76-84 
	    Article Number: ,  
	    Supplement: ,  
	
    
 
    
        
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            Publisher
            Oxford University Press
        
 
        
            Publishing Place
            Journals Dept, 2001 Evans Rd, Cary, Nc 27513 Usa
        
 
	
        
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        Reviewing status
        Peer reviewed
    
 
     
    
        POF-Topic(s)
        30203 - Molecular Targets and Therapies
    
 
    
        Research field(s)
        Radiation Sciences
    
 
    
        PSP Element(s)
        G-501391-001
    
 
    
        Grants
        Swedish Cancer Society
King Gustav V Jubilee Clinic Foundation
Avtal om Lakarutbildning och Klinisk Forskning agreement
Swedish government
German Federal Ministry of Education and Research
    
 
    
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        Erfassungsdatum
        2021-02-15