fig3

Figure 3. (A) A two-dimensional scatter plot illustrates the principal component analysis distribution, with NSCLC subjects indicated in red and healthy controls in green, emphasizing the two most variant peaks (m/z: 1,866, 4,194); (B) A three-dimensional representation post-subgroup dissection in the principal component analysis, contrasting NSCLC subjects (colored red) with healthy controls (colored green); (C) An analysis of spectral differences at the peak (m/z: 1,866) between NSCLC subjects (colored red) and healthy controls (colored green); (D) The ROC curve for the peak (m/z: 1,866), including the AUC metric.