STAT5A and non-small cell lung carcinoma: The analysis of both gene isoforms on mRNA level in NSCLC samples revealed significantly higher expression of STAT5B isoform as compared with STAT5A. It might suppose different functions for both isoforms also in lung cancer cells, i.e., in result, different downstream target genes (including oncogenes) specifically induced by either STAT5A or STAT5B.