Cardiac mortality after radiotherapy, chemotherapy and endocrine therapy for breast cancer: Cohort study of 2 million women from 57 cancer registries in 22 countries.

For women diagnosed prior to 1990, the percentage irradiated was identical in left‐sided and right‐sided breast cancer for all ages at cancer diagnosis combined (49.14%) and when women aged <60 and 60+ years were considered separately the percentage differences in this <1990 group were also small and did not reach statistical significance.

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