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Multiple endocrine neoplasia (MEN)-associated tumours.
1Department of Pathology and Laboratory Medicine, Anatomic Pathology Section, University of Parma, I-43100 Parma, Italy. cesare.bordi@unipr.it
Summary
Multiple Endocrine Neoplasia (MEN) syndromes, types 1 and 2, involve distinct genetic defects leading to tumors in specific endocrine glands. Tumor development follows a similar hyperplastic pattern across MEN types, suggesting potential links in sporadic cases.
Area of Science:
- Endocrinology
- Oncology
- Genetics
Background:
- Multiple Endocrine Neoplasia (MEN) syndromes are inherited disorders predisposing individuals to tumors in endocrine glands.
- MEN type 1 is associated with the MEN 1 tumor suppressor gene (11q13), affecting pituitary, parathyroid, and pancreatic tumors.
- MEN type 2 involves mutations in the RET proto-oncogene (10q11.2), leading to thyroid C-cell, parathyroid, and adrenal medulla tumors.
Purpose of the Study:
- To review the pathological changes in tumors associated with MEN 1 and MEN 2 syndromes.
- To correlate these tumor pathologies with the underlying genetic defects.
- To elucidate the tumor development patterns in MEN syndromes.
Main Methods:
- Review of pathological findings in MEN 1 and MEN 2 associated tumors.
- Analysis of genetic mutations (MEN 1 gene, RET proto-oncogene) linked to MEN syndromes.
- Examination of tumor development patterns, including hyperplasia and nodular lesions.
Main Results:
- MEN 1 tumors result from MEN 1 gene inactivation; MEN 2 tumors stem from RET proto-oncogene mutations.
- MEN 2A and MEN 2B phenotypes correlate with specific RET mutations (exons 10/11 for 2A, codon 918 for 2B).
- Tumorigenesis in MEN involves initial diffuse hyperplasia followed by nodular growth, common across target organs.
Conclusions:
- Tumor development in MEN syndromes follows a consistent hyperplastic and nodular progression.
- The genetic defects in MEN 1 and MEN 2 dictate specific tumor types and locations.
- Endocrine hyperplastic changes and tumors in patients with seemingly sporadic tumors may indicate an underlying MEN condition.