The New England Journal of Medicine
e-mail icon  FREE NEJM E-TOC    HOME   |   SUBSCRIBE   |   CURRENT ISSUE   |   PAST ISSUES   |   COLLECTIONS   |    Advanced Search
Sign in | Get NEJM's E-Mail Table of Contents — Free | Subscribe
 
Original Article
PreviousPrevious
Volume 332:839-847 March 30, 1995 Number 13
NextNext

The Molecular Basis of Turcot's Syndrome
Stanley R. Hamilton, M.D., Bo Liu, Ph.D., Ramon E. Parsons, M.D., Ph.D., Nickolas Papadopoulos, Ph.D., Jin Jen, Ph.D., Steven M. Powell, M.D., Anne J. Krush, M.S., Theresa Berk, M.S.S.A., Zane Cohen, M.D., Bernard Tetu, M.D., Peter C. Burger, M.D., Patricia A. Wood, M.D., Ph.D., Fowzia Taqi, M.D., Susan V. Booker, B.A., Gloria M. Petersen, Ph.D., G. Johan A. Offerhaus, M.D., Anne C. Tersmette, Ph.D., Francis M. Giardiello, M.D., Bert Vogelstein, M.D., and Kenneth W. Kinzler, Ph.D.

 Sign up for free e-toc
 

This Article
-Full Text
- PDF

Commentary
-Letters
-Letters

Tools and Services
-Add to Personal Archive
-Add to Citation Manager
-Notify a Friend
-E-mail When Cited

More Information
-PubMed Citation
ABSTRACT

Background Turcot's syndrome is characterized clinically by the concurrence of a primary brain tumor and multiple colorectal adenomas. We attempted to define the syndrome at the molecular level.

Methods Fourteen families with Turcot's syndrome identified in two registries and the family originally described by Turcot and colleagues were studied. Germ-line mutations in the adenomatous polyposis coli (APC) gene characteristic of familial adenomatous polyposis were evaluated, as well as DNA replication errors and germ-line mutations in nucleotide mismatch-repair genes characteristic of hereditary nonpolyposis colorectal cancer. In addition, a formal risk analysis for brain tumors in familial adenomatous polyposis was performed with a registry data base.

Results Genetic abnormalities were identified in 13 of the 14 registry families. Germ-line APC mutations were detected in 10. The predominant brain tumor in these 10 families was medulloblastoma (11 of 14 patients, or 79 percent), and the relative risk of cerebellar medulloblastoma in patients with familial adenomatous polyposis was 92 times that in the general population (95 percent confidence interval, 29 to 269; P<0.001). In contrast, the type of brain tumor in the other four families was glioblastoma multiforme. The glioblastomas and colorectal tumors in three of these families and in the original family studied by Turcot had replication errors characteristic of hereditary nonpolyposis colorectal cancer. In addition, germ-line mutations in the mismatch-repair gene hMLH1 or hPMS2 were found in two families.

Conclusions The association between brain tumors and multiple colorectal adenomas can result from two distinct types of germ-line defects: mutation of the APC gene or mutation of a mismatch-repair gene. Molecular diagnosis may contribute to the appropriate care of affected patients.


Source Information

From the Division of Gastrointestinal and Liver Pathology, Department of Pathology (S.R.H.); the Oncology Center (S.R.H., B.L., R.E.P., N.P., J.J., S.M.P., S.V.B., B.V., K.W.K.); the Division of Medical Genetics, Department of Medicine (A.J.K.); the Division of Neuropathology, Department of Pathology (P.C.B.); the Department of Pathology (F.T., G.J.A.O.); and the Division of Gastroenterology, Department of Medicine (F.M.G.); School of Medicine, and the Department of Epidemiology, the School of Hygiene and Public Health (G.M.P., A.C.T.), Johns Hopkins University, Baltimore; the Familial Gastrointestinal Cancer Registry, Mount Sinai Hospital, Toronto (T.B., Z.C.); the Laboratoire d'Anatomie Pathologique, Hôtel-Dieu de Québec, Quebec, Canada (B.T.); and the Division of Medical Oncology, Department of Medicine, Stratton Veterans Affairs Medical Center and Albany Medical College, Albany, N.Y. (P.A.W.).

Address reprint requests to Dr. Hamilton at the Department of Pathology, Ross Bldg., Rm. 632, Johns Hopkins University School of Medicine, 720 Rutland Ave., Baltimore, MD 21205-2196.

Full Text of this Article


Related Letters:

The APC Gene in Turcot's Syndrome
Yong W. H., Raffel C., von Deimling A., Louis D. N., Rutz H. P., Kikuchi T.
Extract | Full Text  
N Engl J Med 1995; 333:524, Aug 24, 1995. Correspondence

Survival of Patients with Turcot's Syndrome and Glioblastoma
Merlo A., Rochlitz C., Scott R.
Extract | Full Text  
N Engl J Med 1996; 334:736-737, Mar 14, 1996. Correspondence

This article has been cited by other articles:



HOME  |  SUBSCRIBE  |  SEARCH  |  CURRENT ISSUE  |  PAST ISSUES  |  COLLECTIONS  |  PRIVACY  |  HELP  |  beta.nejm.org

Comments and questions? Please contact us.

The New England Journal of Medicine is owned, published, and copyrighted © 2008 Massachusetts Medical Society. All rights reserved.