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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
PCA-CA of 1H NMR CPMG spectra of baseline plasma samples from HER2-positive ER(+) (cyan) and ER(−) (red) breast cancer patients. Score plot of the first two PCA-CA components (A) and loading plot of PC1 (B). Model LOOCV accuracy of 74.4%, p-value = 0.005.