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Erschienen in: Pituitary 4/2010

01.12.2010

MGMT immunoexpression in aggressive pituitary adenoma and carcinoma

verfasst von: Queenie Lau, Bernd Scheithauer, Kalman Kovacs, Eva Horvath, Luis V. Syro, Ricardo Lloyd

Erschienen in: Pituitary | Ausgabe 4/2010

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Abstract

Recent case reports have documented the efficacy of temozolomide therapy in some aggressive pituitary adenomas and pituitary carcinomas resistant to multimodality therapy. Evidence suggests that low O6-methylguanine-DNA methyltransferase (MGMT) immunoexpression correlates with response to temozolomide chemotherapy. Herein, we aimed to study MGMT immunoexpression in a spectrum of pituitary tumors, indolent, aggressive and malignant. A literature review of the use of temozolomide in pituitary tumors was also performed. Immunohistochemistry for MGMT was performed on 60 pituitary tumors identified in the Mayo Clinic Tissue Registry and the consultation files of one of us (BWS). The group included 30 pituitary carcinomas (15 ACTH, 10 PRL, 1 FSH/LH, 1 TSH, 1 silent subtype 3 and 2 null cell). Tissue from recurrences was available in 17 cases. In addition, 30 functionally different pituitary adenomas were studied, including 15 invasive and 15 non-invasive adenomas. Overall, 32 cases of pituitary tumors (54%) demonstrated low MGMT immunoexpression. This included 17 of 30 (57%) carcinomas, 9 of 15 (60%) invasive adenomas, and 6 of 15 cases (40%) of non-invasive pituitary adenomas. There was no significant change in MGMT immunoexpression between primary and recurrent tumors. Prolactin-producing carcinomas had the highest proportion of tumors (80%) with low expression. A significant proportion of pituitary adenomas and carcinomas demonstrate low MGMT immunoexpression. In an effort to anticipate the likelihood of a temozolomide response, all cases of aggressive pituitary tumors should be assessed for MGMT expression.
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Metadaten
Titel
MGMT immunoexpression in aggressive pituitary adenoma and carcinoma
verfasst von
Queenie Lau
Bernd Scheithauer
Kalman Kovacs
Eva Horvath
Luis V. Syro
Ricardo Lloyd
Publikationsdatum
01.12.2010
Verlag
Springer US
Erschienen in
Pituitary / Ausgabe 4/2010
Print ISSN: 1386-341X
Elektronische ISSN: 1573-7403
DOI
https://doi.org/10.1007/s11102-010-0249-0

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