NPPB and cardiotoxicity: In addition, the increase in NT-proBNP concentrations was more pronounced during the follow-up periods in women who developed cardiotoxicity than in women without cardiotoxicity (171.6 ± 55.3 ng/L vs. 114.1 ± 45.8, p < 0.001, at T1, and 207.8 ± 93.2 vs. 133.7 ± 56.5 ng/L, p = 0.002, at T2, respectively) (Figure 2).