The P53 signalling pathway in the KEGG database (S10K Fig), the small cell lung cancer-related pathway in the WP database (S10L Fig), the IL-4/-2 and TF pathways in the PID database (S10H and S10I Fig) and the MHC pathway in the Biocarta database (S10G Fig) were significantly enriched in the PSCA-high-expression group. The gene discussed is IL4; the disease is small cell lung carcinoma.