Interleukin-6, a growth promoting cytokine, is present in human pituitary adenomas: an immuno-cytochemical study. - Tsagarakis,S.; Kontogeorgeos,G.; Giannou,P.; Thalassinos,N.; Woollley,J.; Besser,G.M.; Grossman,A. (Clin Endocrinol, 1992)