Hamartomatous polyposis syndromes
1Genomic Medicine Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
Insights
Hamartomatous polyposis syndromes, including juvenile polyposis, Peutz-Jeghers, and PTEN hamartoma tumor syndromes, involve gastrointestinal polyps and increased cancer risk. Accurate diagnosis is crucial for management and genetic counseling.
Area of Science:
- Gastroenterology
- Genetics
- Oncology
Background:
- Hamartomatous polyposis syndromes are inherited disorders characterized by gastrointestinal hamartomatous polyps.
- These syndromes, including juvenile polyposis syndrome, Peutz-Jeghers syndrome, and PTEN hamartoma tumor syndrome, have varying polyp characteristics and cancer predispositions.
- Recognition is vital due to significant morbidity and mortality from both malignant and non-malignant complications.
Purpose of the Study:
- To highlight the importance of recognizing hamartomatous polyposis syndromes.
- To emphasize the need for accurate diagnosis for tailored surveillance and management strategies.
- To underscore the role of genetic testing in patient and family management.
Main Methods:
- Review of clinical and genetic features of hamartomatous polyposis syndromes.
- Discussion of diagnostic criteria and surveillance recommendations.
- Exploration of molecular pathogenesis and therapeutic implications.
Main Results:
- Hamartomatous polyposis syndromes present with diverse clinical manifestations and malignancy risks.
- Accurate diagnosis guides syndrome-specific management and surveillance.
- Genetic testing facilitates predictive testing for at-risk family members.
Conclusions:
- Accurate diagnosis of hamartomatous polyposis syndromes is essential for effective management and risk stratification.
- Understanding molecular pathogenesis aids in developing targeted therapies for these and sporadic malignancies.
- Early recognition enables timely genetic counseling and family-focused interventions.
Abstract:
The hamartomatous polyposis syndromes are a heterogeneous group of disorders that share an autosomal-dominant pattern of inheritance and are characterized by hamartomatous polyps of the gastrointestinal tract. These syndromes include juvenile polyposis syndrome, Peutz-Jeghers syndrome and the PTEN hamartoma tumor syndrome. The frequency and location of the polyps vary considerably among syndromes, as does the affected patient's predisposition to the development of gastrointestinal and other malignancies. Although the syndromes are uncommon, it is important for the clinician to recognize these disorders because they are associated with considerable morbidity and mortality, not only from malignancy but also from nonmalignant manifestations such as bleeding, intussusception, and bowel obstruction. Each hamartomatous polyposis syndrome has its own distinctive organ-specific manifestations and each requires a different surveillance strategy, which makes accurate diagnosis crucial for appropriate patient management. The availability of clinical genetic testing for these disorders means that appropriate recognition allows for timely referral for cancer genetic counseling, and often allows for predicative testing in at-risk family members. Promisingly, an understanding of the molecular pathogenesis of these disorders offers insights into the mechanisms underlying the development of sporadic malignancy, and enables rational selection of targeted therapies that warrant further investigation.
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