Carcinoma, Non-Small-Cell Lung, Carcinoma, Small Cell, Cell Line, ELAV Proteins, ELAV-Like Protein 2, ELAV-Like Protein 4, Gene Expression Regulation, Neoplastic, Genetic Variation, Humans, Lung Neoplasms, Nerve Tissue Proteins, Neurosecretory Systems, Oligonucleotide Probes, Phenotype, Polymerase Chain Reaction, RNA, Neoplasm, RNA-Binding Proteins