NPPB and breast cancer: Longer term follow-up (5 to 22 months after RT) studies found no changes in the levels of TnT but demonstrated increased levels of NT-proBNP in left-sided breast cancer patients (NT-proBNP median 90.0 pg/mL; range, 16.7–333.1 pg/mL after RT exposure, compared to NT-proBNP median 63.2 pg/mL; range, 11.0–172.5 pg/mL before RT exposure) [96].