A reappraisal of the Rb1 gene abnormalities in the diagnosis of parathyroid cancer

Filomena Cetani, Elena Pardi, Paolo Viacava, Giada Di Pollina, Giovanni Fanelli, Antonella Picone, Simona Borsari, Elisabetta Gazzerro, Paolo Miccoli, Piero Berti, Aldo Pinchera, Claudio Marcocci

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Abstract

OBJECTIVES: Some histological features may suggest the malignant nature of a parathyroid tumour. However, the diagnosis of parathyroid cancer can only be definitively established in the presence of local invasion or metastases. DESIGN: We further investigated the role of the retino blastoma gene (Rb1) and the breast cancer susceptibility gene (BRCA2) in the differential diagnosis between benign and malignant parathyroid tumours by evaluating loss of heterozygosity (LOH) at these loci and Rb protein (pRb) immunohistochemistry. PATIENTS AND MEASUREMENTS: Fifty-three parathyroid adenomas from patients with sporadic primary hyperparathyroidism (PHPT) and 10 parathyroid cancer specimens were studied. Microsatellite polymorphisms at the Rb1 and BRCA2 loci were polymerase chain reaction (PCR) amplified from each patient's paired tumour and leucocyte DNA samples, using oligonucleotide primers flanking the repeat sequence. Immunohistochemical staining of pRb was carried out using a monoclonal antibody. RESULTS: All but one of the 53 tumour-leucocyte pairs was informative for at least one of the three polymorphic markers of the Rb1 gene. Fifteen adenomas (28.8%) showed LOH. Regarding the BRCA2 gene, 46 tumour-leucocyte pairs were informative and LOH was present in eight (17.4%). All six carcinomas had LOH for at least one marker at the Rb1 locus. LOH for the BRCA2 microsatellite was found in three of the five informative primary tumour samples. Immunohistochemical analysis revealed that all adenomas were positive and the number of pRb-positive cells varied significantly among different samples.The mean percentage of stained cells was 15-7%. Eleven of the 30 (36.7%) adenomas showed sparse positive staining, 13 (43.3%) intermediate staining and six (20%) extensive staining. All parathyroid cancers were entirely negative for pRb immunostaining. CONCLUSIONS: Inactivation of the Rb1 gene is a common event in parathyroid tumorigenesis. Retention of heterozygosity seems to exclude parathyroid malignancy, which is suggested by the combined finding of LOH and lack of protein expression.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalClinical Endocrinology
Volume60
Issue number1
DOIs
Publication statusPublished - Jan 2004

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Parathyroid Neoplasms
Loss of Heterozygosity
Genes
Neoplasms
Adenoma
Staining and Labeling
Leukocytes
Microsatellite Repeats
BRCA2 Gene
Retinoblastoma Protein
DNA Primers
Primary Hyperparathyroidism
Terminal Repeat Sequences
Neoplasm Genes
Gene Silencing
Carcinogenesis
Differential Diagnosis
Immunohistochemistry
Monoclonal Antibodies
Breast Neoplasms

ASJC Scopus subject areas

  • Endocrinology

Cite this

Cetani, F., Pardi, E., Viacava, P., Di Pollina, G., Fanelli, G., Picone, A., ... Marcocci, C. (2004). A reappraisal of the Rb1 gene abnormalities in the diagnosis of parathyroid cancer. Clinical Endocrinology, 60(1), 99-106. https://doi.org/10.1111/j.1365-2265.2004.01954.x

A reappraisal of the Rb1 gene abnormalities in the diagnosis of parathyroid cancer. / Cetani, Filomena; Pardi, Elena; Viacava, Paolo; Di Pollina, Giada; Fanelli, Giovanni; Picone, Antonella; Borsari, Simona; Gazzerro, Elisabetta; Miccoli, Paolo; Berti, Piero; Pinchera, Aldo; Marcocci, Claudio.

In: Clinical Endocrinology, Vol. 60, No. 1, 01.2004, p. 99-106.

Research output: Contribution to journalArticle

Cetani, F, Pardi, E, Viacava, P, Di Pollina, G, Fanelli, G, Picone, A, Borsari, S, Gazzerro, E, Miccoli, P, Berti, P, Pinchera, A & Marcocci, C 2004, 'A reappraisal of the Rb1 gene abnormalities in the diagnosis of parathyroid cancer', Clinical Endocrinology, vol. 60, no. 1, pp. 99-106. https://doi.org/10.1111/j.1365-2265.2004.01954.x
Cetani, Filomena ; Pardi, Elena ; Viacava, Paolo ; Di Pollina, Giada ; Fanelli, Giovanni ; Picone, Antonella ; Borsari, Simona ; Gazzerro, Elisabetta ; Miccoli, Paolo ; Berti, Piero ; Pinchera, Aldo ; Marcocci, Claudio. / A reappraisal of the Rb1 gene abnormalities in the diagnosis of parathyroid cancer. In: Clinical Endocrinology. 2004 ; Vol. 60, No. 1. pp. 99-106.
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AU - Fanelli, Giovanni

AU - Picone, Antonella

AU - Borsari, Simona

AU - Gazzerro, Elisabetta

AU - Miccoli, Paolo

AU - Berti, Piero

AU - Pinchera, Aldo

AU - Marcocci, Claudio

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N2 - OBJECTIVES: Some histological features may suggest the malignant nature of a parathyroid tumour. However, the diagnosis of parathyroid cancer can only be definitively established in the presence of local invasion or metastases. DESIGN: We further investigated the role of the retino blastoma gene (Rb1) and the breast cancer susceptibility gene (BRCA2) in the differential diagnosis between benign and malignant parathyroid tumours by evaluating loss of heterozygosity (LOH) at these loci and Rb protein (pRb) immunohistochemistry. PATIENTS AND MEASUREMENTS: Fifty-three parathyroid adenomas from patients with sporadic primary hyperparathyroidism (PHPT) and 10 parathyroid cancer specimens were studied. Microsatellite polymorphisms at the Rb1 and BRCA2 loci were polymerase chain reaction (PCR) amplified from each patient's paired tumour and leucocyte DNA samples, using oligonucleotide primers flanking the repeat sequence. Immunohistochemical staining of pRb was carried out using a monoclonal antibody. RESULTS: All but one of the 53 tumour-leucocyte pairs was informative for at least one of the three polymorphic markers of the Rb1 gene. Fifteen adenomas (28.8%) showed LOH. Regarding the BRCA2 gene, 46 tumour-leucocyte pairs were informative and LOH was present in eight (17.4%). All six carcinomas had LOH for at least one marker at the Rb1 locus. LOH for the BRCA2 microsatellite was found in three of the five informative primary tumour samples. Immunohistochemical analysis revealed that all adenomas were positive and the number of pRb-positive cells varied significantly among different samples.The mean percentage of stained cells was 15-7%. Eleven of the 30 (36.7%) adenomas showed sparse positive staining, 13 (43.3%) intermediate staining and six (20%) extensive staining. All parathyroid cancers were entirely negative for pRb immunostaining. CONCLUSIONS: Inactivation of the Rb1 gene is a common event in parathyroid tumorigenesis. Retention of heterozygosity seems to exclude parathyroid malignancy, which is suggested by the combined finding of LOH and lack of protein expression.

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