Volume 26, Issue 4 pp. 322-328
Research Article

Fine-structure deletion mapping of 10q22–24 identifies regions of loss of heterozygosity and suggests that sporadic follicular thyroid adenomas and follicular thyroid carcinomas develop along distinct neoplastic pathways

Jen Jen Yeh

Jen Jen Yeh

Clinical Cancer Genetics and Human Cancer Genetics Programs, Ohio State University Comprehensive Cancer Center, Columbus, Ohio

Charles A. Dana Human Cancer Genetics Unit, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, Massachusetts

Department of Surgery, Boston University School of Medicine, Boston, Massachusetts

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Debbie J. Marsh

Debbie J. Marsh

Clinical Cancer Genetics and Human Cancer Genetics Programs, Ohio State University Comprehensive Cancer Center, Columbus, Ohio

Charles A. Dana Human Cancer Genetics Unit, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, Massachusetts

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Jan Zedenius

Jan Zedenius

Center for Metabolism and Endocrinology, Department of Surgery, Karolinska Institute at Huddinge University Hospital, Stockholm, Sweden

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Trisha Dwight

Trisha Dwight

Molecular Genetics Laboratory, Royal North Shore Hospital, Department of Medicine, University of Sydney, St. Leornards, NSW, Australia

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Leigh Delbridge

Leigh Delbridge

Department of Surgery, Royal North Shore Hospital and University of Sydney, Sydney, Australia

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Bruce G. Robinson

Bruce G. Robinson

Molecular Genetics Laboratory, Royal North Shore Hospital, Department of Medicine, University of Sydney, St. Leornards, NSW, Australia

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Charis Eng

Corresponding Author

Charis Eng

Clinical Cancer Genetics and Human Cancer Genetics Programs, Ohio State University Comprehensive Cancer Center, Columbus, Ohio

Cancer Research Campaign Human Cancer Genetics Research Group, University of Cambridge, Cambridge, United Kingdom

Human Cancer Genetics Program, Ohio State University Comprehensive Cancer Center, 690C Medical Research Facility, 420 W. 12th Avenue, Columbus, OH 43210.Search for more papers by this author

Abstract

Previous studies have demonstrated frequent loss of heterozygosity (LOH) of markers on chromosome arm 10q in both follicular thyroid carcinomas (FTCs) and follicular thyroid adenomas (FAs). A novel tumor suppressor gene, PTEN, has been mapped to 10q23.3 and is the susceptibility gene for Cowden syndrome, an autosomal dominant disorder characterized by multiple hamartomas and a risk of benign and malignant tumors of the breast and thyroid. Studies examining the relationship of somatic PTEN status and follicular thyroid neoplasms have only demonstrated a variable subset of tumors that have somatic monoallelic deletions of PTEN, suggesting that other tumor suppressor genes may be present in this region. We therefore sought to conduct a detailed examination of LOH of 20 polymorphic markers in a 19-cM region spanning 10q22–24, including PTEN, in 44 FAs and 17 FTCs. Using this fine-structure somatic mapping approach, we defined at least two novel regions of LOH in follicular adenomas and follicular carcinomas, suggesting the presence of at least two distinct tumor suppressor genes that may play a role in thyroid neoplasia. Furthermore, the difference in patterns of LOH in adenomas versus carcinomas lends additional support to the hypothesis that adenomas and carcinomas can develop along two separate, nonserial pathways. Genes Chromosomes Cancer 26:322–328, 1999. © 1999 Wiley-Liss, Inc.

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