Investigation of potential breath biomarkers for the early diagnosis of breast cancer using gas chromatography-mass spectrometry.BACKGROUND
 End-tailed breath were collected by Bio-VOC® sampler and assayed by gas chromatography-mass spectrometry. 
gas chromatography-mass spectrometry
Kruskal-Wallis one-way analysis of variance test and binary logistic regression were used for data analysis. 
Kruskal-Wallis one-way analysis of variance test
Kruskal-Wallis one-way analysis of variance test and binary logistic regression were used for data analysis. 
binary logistic regression
The diagnostic accuracies were evaluated by receiver operating characteristic curves. 
receiver operating characteristic curves
A predictive model/equation was generated using the 4 biomarkers and validated by leave-one-out cross-validation.



leave-one-out cross-validation