The protein expression of glycolysis‐related enzymes (HK2, LDHA and GLUT1) was confirmed to be decreased in PFD‐treated lung adenocarcinoma cells (A549 and H1299) but not in PFD‐treated lung squamous carcinoma cells by western blotting (Figure 2D,E, Figure S1). The gene discussed is HK2; the disease is lung adenocarcinoma.