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Maspin highlights colorectal serrated polyps: preliminary findings
Carlos A Rubio1, Ann Kaufeldt2
1Department of Pathology, Karolinska Institute and University Hospital, Stockholm, Sweden Carlos.Rubio@ki.se.
Aims:
Maspin, a 42-kDa serine proteinase inhibitor, is a tumor suppressor protein that stimulates apoptosis and inhibits motility, invasion and cancer metastasis. Mutant maspin leads to partial loss of tumor suppressor function, decreased susceptibility to apoptosis and to malignant progression. We recently found maspin expression (ME) in the cytoplasm of serrated colonic lesions, such as hyperplastic polyps (HP) and sessile serrated adenoma/polyps (SSA/P).
Materials And Methods:
ME was investigated in 10 colorectal lesions: three HP, three SSA/P and four conventional colorectal adenomas (CCRA).
Results:
Widespread cytoplasmic ME (comprising the entire height and width of the lesion) was present in the three HP and in the three SSA/P. In contrast, ME was only focally expressed in the four CCRA. ME was not present in the normal mucosa adjacent to those lesions.
Conclusion:
These preliminary findings suggest that maspin might be of help in discriminating between serrated colonic lesions (HP and SSA/P) and CCRA.
Insights
Maspin expression differs between colorectal lesion types. Widespread cytoplasmic maspin expression was found in serrated lesions (hyperplastic polyps and sessile serrated adenoma/polyps), but not in conventional adenomas, aiding in discrimination.
Area of Science:
- Oncology
- Gastroenterology
- Molecular Biology
Background:
- Maspin is a tumor suppressor protein inhibiting cancer progression.
- Mutant maspin is linked to reduced apoptosis and malignant progression.
- Maspin expression was recently observed in serrated colonic lesions.
Purpose of the Study:
- To investigate maspin expression patterns in various colorectal lesions.
- To determine if maspin expression can differentiate serrated lesions from conventional adenomas.
Main Methods:
- Maspin expression was analyzed in hyperplastic polyps (HP), sessile serrated adenoma/polyps (SSA/P), and conventional colorectal adenomas (CCRA).
- Immunohistochemical analysis was performed on 10 colorectal lesions.
Main Results:
- Widespread cytoplasmic maspin expression was detected in all HP and SSA/P samples.
- Focal maspin expression was observed in CCRA samples.
- Normal colonic mucosa adjacent to lesions showed no maspin expression.
Conclusions:
- Maspin expression patterns may help distinguish serrated colonic lesions from conventional adenomas.
- These preliminary findings suggest maspin as a potential diagnostic marker.
