The heatmap in Figure 2D showed the expression levels of these 20-potential prognostic ferroptosis-related DEGs in LUAD and normal lung tissues, from which we could found that only 4 genes (ALOX15, DUOX1, CDO1, and IL33) were highly expressed in normal tissues, while the remaining 16 genes were highly expressed in tumor tissues. The gene discussed is IL33; the disease is neoplasm.