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Multiple endocrine neoplasia
1Department of Surgery, Washington University School of Medicine, St. Louis, Missouri 63110.
Abstract:
The MEN syndromes continue to be the focus of considerable interest and research. Since successful treatment requires early diagnosis, proper screening and follow-up of patients at risk is important. In the individual at risk for developing MEN IIa, annual screening should include measurement of the basal and stimulated plasma CT levels, and determination of plasma levels of calcium, PTH, and CEA. Twenty-four hour urine excretion rates of norepinephrine, epinephrine, metanephrine, dopamine, and VMA should also be obtained. It is our recommendation that this screening be continued through the third decade of life. Patients having thyroidectomy for MTC need to be tested annually for recurrent MTC and the development of adrenal medullary disease. All patients at risk for developing MEN IIb should be evaluated in a similar fashion. Recently, several groups using DNA linkage analysis have mapped the gene for MEN IIa to chromosome 10, although the exact location of the gene is yet to be determined. Preliminary linkage studies have mapped the gene for MEN I to chromosome 11. The identification of the genes for MEN I and MEN II will greatly simplify the diagnosis of the disease and perhaps also the therapy of affected patients.
Insights
Early diagnosis of Multiple Endocrine Neoplasia (MEN) syndromes is crucial for successful treatment. Annual screening for MEN IIa and MEN IIb involves specific biochemical tests and genetic analysis for improved patient outcomes.
Area of Science:
- Endocrinology
- Genetics
- Oncology
Background:
- Multiple Endocrine Neoplasia (MEN) syndromes require early diagnosis for effective treatment.
- Screening and follow-up of at-risk patients are essential for managing MEN syndromes.
- Ongoing research focuses on understanding the genetic basis of MEN syndromes.
Purpose of the Study:
- To outline recommended screening protocols for individuals at risk of developing MEN IIa and MEN IIb.
- To highlight the importance of early diagnosis and continuous monitoring for MEN patients.
- To discuss the current progress in gene mapping for MEN I and MEN II syndromes.
Main Methods:
- Annual screening for MEN IIa includes plasma calcitonin (CT), calcium, parathyroid hormone (PTH), and carcinoembryonic antigen (CEA) levels.
- Urine analysis for catecholamines (norepinephrine, epinephrine, dopamine) and their metabolites (metanephrine, VMA) is recommended.
- DNA linkage analysis is being used to map the genes responsible for MEN I and MEN IIa.
Main Results:
- Recommended screening for MEN IIa involves annual biochemical testing and urine analysis through the third decade of life.
- Post-thyroidectomy patients require annual testing for recurrent medullary thyroid carcinoma (MTC) and adrenal medullary disease.
- Genetic mapping has localized the MEN IIa gene to chromosome 10 and the MEN I gene to chromosome 11.
Conclusions:
- Comprehensive screening protocols are vital for early detection and management of MEN syndromes.
- Genetic identification of MEN genes will significantly aid in diagnosis and potentially therapy.
- Continued research into MEN syndromes promises improved patient care and outcomes.
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