Among the redox status markers evaluated, only FRAP impacts the absorbance value obtained at wavenumbers 3874 cm−1 (β = −0.038; p < 0.001), 3876 cm−1 (β = −0.059; p < 0.001) and 3878 cm−1 (β = −0.066; p < 0.001) of the HER2+ BC infrared spectrum. The gene discussed is ERBB2; the disease is breast cancer.