Imaging for early stage breast cancer

What is the risk of major coronary event or heart death at these dose levels?

From supplementary files: RT at age 60 years No cardiac risk factors MHD

Absolute risk of RT related death from IHD by age 80

9 Gy 5 Gy 4 Gy 2 Gy

1%

0.6% 0.5% 0.2%

If 1 risk factor for IHD 5 Gy 1.1%

Darby et al, NEJM 2013