Clonality of parathyroid tumors in familial multiple endocrine neoplasia type 1

Volume 321:213-218		July 27, 1989		Number 4

Clonality of parathyroid tumors in familial multiple endocrine neoplasia type 1

E Friedman, K Sakaguchi, AE Bale, A Falchetti, E Streeten, MB Zimering, LS Weinstein, WO McBride, Y Nakamura, ML Brandi, and et al.

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Abstract

Familial multiple endocrine neoplasia type 1 (MEN-1) is characterized by tumors of the parathyroids, endocrine pancreas, and anterior pituitary. Since the gene associated with MEN-1, located on chromosome 11 (11q13), may normally inhibit tumor proliferation, tumors could arise from inactivation of one or both of the alleles. However, parathyroid tumors in patients with MEN-1 have been considered to result from polyclonal hyperplasia. Using genetic probes, we tested parathyroid tumors for a monoclonal component, represented by a loss of alleles at any of eight loci along chromosome 11. Ten of 16 tumors from 14 patients with familial MEN-1 had losses of alleles from chromosome 11. Tumors with losses were larger than those without (1.6 vs. 0.2 g; P less than 0.002), suggesting that a monoclonal adenoma may develop after a phase of polyclonal hyperplasia. In 7 of 10 tumors, the subregion of loss was less than the full length of chromosome 11 but always included one copy of the MEN-1 locus. Of 34 sporadic adenomas from patients without MEN-1, 9 showed similar allelic losses in chromosome 11; in 7 the losses included the apparent MEN-1 locus. We conclude that many "hyperplastic" parathyroid tumors in familial MEN-1 are in fact monoclonal and may progress or even begin to develop by inactivation of the MEN-1 gene (at 11q13) in a precursor cell. Some sporadic adenomas have allelic losses on chromosome 11, which may also involve the MEN-1 gene.

Source Information

Molecular Pathophysiology Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Md.

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