Background The origin and molecular pathogenesis of parathyroidcarcinoma are unknown. This life-threatening cause of primaryhyperparathyroidism cannot be reliably distinguished from itsbenign counterpart on the basis of histopathological featuresalone. Because the PRAD1, or cyclin D1, gene, a cell-cycle regulator,has been implicated in a subgroup of benign parathyroid tumors,we examined the possibility that another cell-cycle regulatorwith possible functional links to PRAD1, the retinoblastomatumor-suppressor gene (RB), might be involved in the molecularpathogenesis of parathyroid carcinoma.
Methods Parathyroid carcinomas from 9 patients and adenomasfrom 21 were studied for evidence of tumor-specific loss ofRB gene DNA (allelic loss) by analysis of four DNA polymorphismsand for evidence of altered expression of RB protein by immunohistochemicalstaining.
Results All of 11 specimens from 5 patients with parathyroidcarcinoma and informative DNA patterns and 1 of 19 specimensfrom 19 patients with parathyroid adenoma and informative DNApatterns lacked an RB allele. Fourteen of 16 specimens (88 percent)from the nine patients with carcinoma had abnormal expressionof RB protein (a complete or predominant absence of nuclearstaining for the protein). None of the 19 adenomas, includingthe tumor with loss of an RB allele, had unequivocally abnormalstaining for RB protein.
Conclusions Inactivation of the RB gene is common in parathyroidcarcinoma and is likely to be an important contributor to itsmolecular pathogenesis. The presence of such inactivation mayhelp to distinguish benign from malignant parathyroid diseaseand may have useful diagnostic, prognostic, and therapeuticimplications.
Source Information
From the Laboratory of Endocrine Oncology, Department of Medicine and Massachusetts General Hospital Cancer Center (V.L.C., A.A.), and the Department of Pathology, Massachusetts General Hospital and Harvard Medical School (A.T., A.L.V.), Boston; the Center for Biotechnology, Baylor College of Medicine, The Woodlands, Tex. (H.-J.X., S.-X.H., W.F.B.); and the Section of Endocrinology, Denver Veterans Affairs Medical Center and the University of Colorado Health Sciences Center, Denver (M.E.W.).
Address reprint requests to Dr. Arnold at Jackson 1021, Massachusetts General Hospital, Boston, MA 02114.
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