期刊
FOLIA NEUROPATHOLOGICA
卷 58, 期 4, 页码 357-364出版社
TERMEDIA PUBLISHING HOUSE LTD
DOI: 10.5114/fn.2020.102438
关键词
Cushing's disease; cortisol; MGMT; transsphenoidal surgery; temozolomide
资金
- Warsaw Medical University and Military Institute of Medicine, Warsaw, Poland
Introduction: Transsphenoidal surgery is the treatment of choice in Cushing's disease (CD), although even late recurrences occur in some patients. Low expression of O-6-methylguanine-DNA methyltransferase (MGMT) has been linked to a high risk of relapse in pituitary tumours, but the evidence for corticotroph adenomas is limited. Therefore, we investigated whether MGMT expression was associated with CD remission or clinicopathological markers of tumour aggressiveness among patients with corticotroph adenomas. Material and methods: We included 72 consecutive patients (83% female, mean age +/- SD: 44.15 +/- 15.15 years) with CD, who underwent transsphenoidal adenomectomy between 2012 and 2018. The invasiveness of corticotroph tumours was assessed based on the Knosp scale. Immunohistochemistry was used to analyse MGMT expression as well as the proliferation markers (Ki-67, p53, mitotic index). Electron microscopy was used to categorise tumours into densely or sparsely granulated. Early biochemical remission was evaluated in all patients 6 months after pituitary surgery. Results: Early remission was observed in 47 (65%) patients 6 months after surgery. MGMT expression was > 75% in half of all tumours, < 25% in 14 tumours, and 25-50% or 50-75% in 11 tumours. Lower MGMT expression was associated with a larger tumour diameter (p = 0.001), higher adrenocorticotropic hormone (ACTH) concentration (p = 0.002), higher p53 expression (p = 0.026), and higher frequency of sparsely granulated corticotroph adenomas (p = 0.009). Low MGMT expression was significantly related to lower frequency of early clinical remission (p = 0.005). Conclusions: MGMT predicted the outcomes of transsphenoidal surgery for CD. Pituitary corticotroph adenomas with low MGMT expression may be associated with increased invasiveness and poorer prognosis.
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