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What is a juvenile polyp? An analysis based on 21 patients with solitary and multiple polyps
1Division of Pediatric Pathology, Primary Children's Medical Center, University of Utah Health Sciences, Salt Lake City 84113, USA.
Insights
Juvenile polyps, common in children, may be premalignant. Dysplasia and markers of neoplastic transformation were found, suggesting a potential for malignant change, especially in juvenile polyposis cases.
Area of Science:
- Gastroenterology
- Pediatric Pathology
- Oncology
Background:
- Juvenile polyps are the most common pediatric gastrointestinal polyps.
- Traditionally viewed as hamartomas or inflammatory lesions, recent findings suggest a premalignant potential.
- The link between solitary polyps and malignancy is less understood than in juvenile polyposis.
Purpose of the Study:
- To investigate the prevalence and significance of dysplasia in juvenile polyps.
- To analyze histological and immunohistochemical markers associated with neoplastic transformation.
- To compare findings in solitary polyps versus those in juvenile polyposis.
Main Methods:
- Histological and immunohistochemical analysis of 28 juvenile polyps from 21 patients.
- Evaluation for substances linked to colorectal adenoma-carcinoma sequence.
- Assessment of p53 and human chorionic gonadotropin (hCG) immunoreactivity.
Main Results:
- Dysplasia foci were identified in polyps from 11 patients.
- p53 and hCG immunoreactivity was present in 12 of the 28 polyps.
- These neoplastic markers were more frequent in polyposis specimens compared to solitary polyps.
Conclusions:
- Juvenile polyps possess a potential for neoplastic and malignant transformation.
- These lesions share features of inflammatory processes alongside premalignant characteristics.
- Further research is needed to guide clinical management and pathological evaluation of juvenile polyps.
Background:
Juvenile polyps, the most common pediatric gastrointestinal polyp, have been typically characterized as either hamartomatous overgrowths or reactive inflammatory proliferations. Recent observations of excessive colonic and gastric carcinoma and dysplasia in juvenile polyposis have prompted reclassification of this entity as a premalignant condition. The relationship between solitary or multiple juvenile polyps and malignancy is less clear.
Patients And Methods:
To further investigate the frequency and significance of dysplasia in juvenile polyps, we analyzed 28 polyps from 21 patients histologically and immunohistochemically for substances previously associated with neoplastic transformation in the colorectal adenomacarcinoma sequence.
Results:
Fifteen patients had a solitary polyp, two had 2 to 9 polyps, and four had polyposis with 10 or more polyps. Most polyps exhibited inflammatory or regenerative atypia. Foci of dysplasia were noted in polyps from 11 patients, and immunoreactivity for p53 and human chorionic gonadotropin was present in 12 of the 28 polyps each. These findings were all more frequent in the polyposis specimens than in solitary polyps.
Conclusions:
These observations, in combination with reports of an increased risk of carcinoma in juvenile polyposis, suggest that juvenile polyps are lesions with a potential for neoplastic and malignant transformation, although they share features of an inflammatory reactive process. The implications for clinical management of patients and pathologic evaluation of juvenile polyps warrant further investigation.