A lack of statistically important changes in the level of analyzed transcripts was shown in the case of invasive and non-invasive pituitary tumors (Figs. 4, 5, 6: survivin, P = 0.5905, ∆Ex3, P = 0.08620, 2β, P = 0.0818). This evidence concerns the gene BIRC5 and pituitary tumor.