NPPB and breast carcinoma: Recently, a long‐term retrospective study reported that median plasma BNP levels in 5‐year breast cancer survivors after radiation therapy remain within the normal range, but the delta‐BNP levels are positively related to the mean heart dose and mean left ventricular dose received.24However, the significance of BNP in the diagnosis and evaluation of radiation‐induced cardiac disease is not fully understood.