High Ki-67 expression is associated with prolactin secreting pituitary adenomas.

Abstract:

:Pituitary adenomas represent the third most common primary intracranial tumor in neurosurgical practice. To understand the biological behaviour of the pituitary adenomas previous studies have determined the tumor proliferation rate using monoclonal antibodies targeted against the Ki-67 antigen. The aim of this study was to correlate the Ki-67 index with hormonal profiles of pituitary adenomas. The study included 50 pituitary adenomas. For histopathologic evaluation, the sections were stained with routine hematoxylin and eosin method. Additional paraffin sections from each tumor were immunostained using primary antibodies against the following pituitary hormones: somatotropin (STH), prolactin (PRL), adrenocorticotrophic hormone (ACTH), thyroid-stimulating hormone (TSH), follicle-stimulating hormone (FSH), and luteinizing hormone (LH). To detect the expression of Ki-67 we used a mouse anti-human monoclonal antibody (clone K2). The percentage of Ki-67 positive nuclei (Ki-67 labeling index) was assessed by counting approximately 1000 nuclei of the tumor cells at ×400 magnification. Out of the 50 tumor samples, 31 (62%) pituitary adenomas showed proliferative activity, and the proliferation rate was variable in this group. The overall mean Ki-67 labeling index was 1.59 ± 1.47, ranging from 0.3% to 6.6%. In 5 cases, the Ki-67 index was >3%, all of them being prolactinomas. The Ki-67 index was higher in PRL-secreting adenomas (mean ± SD was 3.37 ± 1.80, range 0.9 - 6.6%). Our study provides the evidence that a higher Ki-67 value is associated with pituitary adenomas that secrete PRL (prolactinomas and mixed STH/PRL-secreting adenomas).

journal_name

Bosn J Basic Med Sci

authors

Bălinişteanu B,Cîmpean AM,Ceauşu AR,Corlan AS,Melnic E,Raica M

doi

10.17305/bjbms.2017.1750

subject

Has Abstract

pub_date

2017-05-20 00:00:00

pages

104-108

issue

2

eissn

1512-8601

issn

1840-4812

journal_volume

17

pub_type

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