Evaluación por inmunohistoquímica de la expresión de hormonas hipofisiarias y del marcador de proliferación celular Ki-67 en tejido de adenomas causantes de acromegalia / Immunohistochemistry for pituitary hormones and Ki-67 in growth hormone producing pituitary adenomas
Growth hormone (GH) producing adenomas, frequently express several hormones. This condition could confer them a higher proliferative capacity. Ki-67 is a nuclear proteinantigen that is a marker for proliferative activity.
Aim:
To measure the immunohistochemical hormone expression in pituitary adenomas, excised from patients with acromegaly. To determine if the pluríhormonal condition of these adenomas is associated with a higher proliferative capacity, assessed through the expression of Ki-67. Material and
All samples were positive for GH. Twenty seven had positive staining for PRL, 12 had positive staining for glycoproteic hormones and 11 for PRL and one or more glycoproteic hormones. Mean staining for Ki-67 was Z.6±3.3 percent. There were no differences in the expression of this marker between mono or pluríhormonal tumors. The expression was neither associated with extrasellar extensión.
Conclusions:
Half of GH producing pituitary adenomas are pluríhormonal. There are no differences in the expression of Ki-67 between mono and plurihormonal adenomas.