Totally,18 GO terms and 5 KEGG terms were selected, including small cell lung cancer, pathways in cancer, neurotrophin signaling pathway, chemokine signaling pathway in KEGG pathway and regulation of synaptic vesicle exocytosis, positive regulation of jnk cascade, dioxygenase activity, response to vitamin d, transcription coactivator binding, bone mineralization, and negative regulation of protein catabolic process in GO terms. This evidence concerns the gene BDNF and small cell lung carcinoma.