SOD1 and breast cancer: Meanwhile, in the serum of women with BBD, the SOD enzyme level is the highest, which affects the absorbance on the same wavenumbers [3874 cm−1 (β = 13.525; p = 0.034), 3876 cm−1 (β = 18.571; p = 0.001) and 3878 cm−1 (β = 24.565; p = 0.042)], and this characteristic allows us to distinguish them from HER2− BC samples (AUC = 0.92).