Hydrogen peroxide catabolic process (FDR = 0.00000374185), lipoprotein metabolic process (FDR = 0.0000344958), extracellular region (FDR = 0.00000000556057), peroxidase activity (FDR = 0.00000459332) and haptoglobin binding (FDR = 0.000110832) were significantly enriched GO terms of DEPs in pneumonia (two patients). The gene discussed is HP; the disease is pneumonia.