Hormone production in clinically nonfunctioning pituitary adenomas

Peter McL. Black Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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Dora W. Hsu Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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Anne Klibanski Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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Bernard Kliman Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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J. Larry Jameson Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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E. Chester Ridgway Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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E. Tessa Hedley-Whyte Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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Nicholas T. Zervas Neuroendocrine Center and Neurosurgical, Neuropathology, and Neuroendocrinology Services, Massachusetts General Hospital and Departments of Surgery, Pathology, and Medicine, Harvard Medical School, Boston, Massachusetts

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Volume 66: Issue 2
DOI link:
https://doi.org/10.3171/jns.1987.66.2.0244
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✓ Pituitary tumors in which no excess hormone secretion can be identified clinically have been considered as nonfunctioning or null-cell adenomas. Immunocytochemical data presented here suggest that many of these tumors contain subunits of the glycoprotein hormones.

Of 160 patients referred for pituitary surgery, 37 (23%) had no evidence of excess hormone secretion on preoperative endocrine evaluation. Immunocytochemical staining of these tumors was carried out using antibodies specific for prolactin, growth hormone, adrenocorticotropic hormone, the beta subunits of luteinizing hormone (β-LH), follicle-stimulating hormone (β-FSH), and thyroid-stimulating hormone (β-TSH), and the alpha subunit.

One or more of these pituitary hormones were detected in 73% of cases. The alpha and beta subunits were detected most frequently, being found in 68% of cases; 27% had staining for one or more beta subunits and 37.9% had staining for both alpha and beta subunits. The incidence was: β-FSH in 58%, β-LH in 47%, β-TSH in 33%, and the alpha subunit in 42%. Staining for multiple glycoprotein hormones was common (52%), and mixed glycoprotein hormones and prolactin cell types were found in 16% of cases. These data suggest that most apparently nonfunctioning pituitary tumors contain immunoreactive hormones and the majority of these are subunits of the glycoprotein hormones. Since the glycoprotein hormone beta subunits must combine with the alpha subunit to produce biologically active hormones, the production of the subunits alone may not have endocrine manifestations.

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Address reprint requests to: Peter McL. Black, M.D., Ph.D., Neurosurgical Service, Massachusetts General Hospital, Boston, Massachusetts 02114.
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