Fig. 1

Comparisons of biomarkers between lung cancer patients and healthy controls in the training and validation cohorts. Shox2 short stature homeobox 2 gene, ep4 prostaglandin E2 receptor 4 gene (PTGER4), idh1 isocitrate dehydrogenase 1, y-axis cycle threshold, H healthy controls, C lung cancer patients, **p value < 0.05