Risk of ischemic heart disease after radiotherapy for ductal carcinoma in situ.

Abstract:

PURPOSE:The use of adjuvant radiotherapy (RT) in the management of ductal carcinoma in situ (DCIS) is increasing. Left-sided breast irradiation may involve exposure of the heart to ionising radiation, increasing the risk of ischemic heart disease (IHD). We examined the incidence of IHD in a population-based cohort of women with DCIS. METHODS:The Breast Cancer DataBase Sweden (BCBase) cohort includes women registered with invasive and in situ breast cancers 1992-2012 and age-matched women without a history of breast cancer. In this analysis, 6270 women with DCIS and a comparison cohort of 31,257 women were included. Through linkage with population-based registers, data on comorbidity, socioeconomic status and incidence of IHD was obtained. Hazard ratios (HR) for IHD with 95% confidence intervals (CI) were analysed. RESULTS:Median follow-up time was 8.8 years. The risk of IHD was not increased for women with DCIS versus women in the comparison cohort (HR 0.93; 95% CI 0.82-1.06), after treatment with radiotherapy versus surgery alone (HR 0.77; 95% CI 0.60-0.98) or when analysing RT by laterality (HR 0.85; 95% CI 0.53-1.37 for left-sided versus right-sided RT). CONCLUSIONS:The risk of IHD was lower for women with DCIS allocated to RT compared to non-irradiated women and to the comparison cohort, probably due to patient selection. Comparison of RT by laterality did not show any over-risk for irradiation of the left breast.

authors

Wadsten C,Wennstig AK,Garmo H,Nilsson G,Blomqvist C,Holmberg L,Fredriksson I,Wärnberg F,Sund M

doi

10.1007/s10549-018-4803-1

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

95-101

issue

1

eissn

0167-6806

issn

1573-7217

pii

10.1007/s10549-018-4803-1

journal_volume

171

pub_type

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