The expression levels for three members of class I HDAC (HDAC 1, 2 and 8) and three members of class II HDAC (HDAC 4, 5 and 6) were analyzed by quantitative real-time polymerase chain reaction (qRT-PCR) in two NSCLC cell lines, as well as in lung cancer tissue from twenty patients. This evidence concerns the gene HDAC9 and lung carcinoma.