PI3K-Akt signalling pathway, protein digestion and absorption, extracellular matrix receptor interaction, TGF-β signalling pathway, miRNAs in cancer, small cell lung cancer, neurotrophin signalling pathway, p53 signalling pathway, platelet activation, apoptosis, and ErbB signalling pathway are some of the predominant pathways. This evidence concerns the gene BDNF and small cell lung carcinoma.