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C-myc oncogene expression in anal squamous neoplasia
O A Ogunbiyi1, J H Scholefield, K Rogers
1University Department of Surgery, Clinical Sciences Centre, Northern General Hospital, Sheffield.
Journal of Clinical Pathology
|January 1, 1993
Summary
Oncogene c-myc expression patterns in anal squamous neoplasia indicate its role in disease progression. Immunohistochemical staining for c-myc protein may help identify high-risk anal intraepithelial neoplasia III lesions.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Anal squamous neoplasia encompasses a spectrum of conditions from anal intraepithelial neoplasia (AIN) to invasive squamous cell carcinoma.
- Understanding the molecular mechanisms driving the progression of AIN to invasive cancer is crucial for early detection and intervention.
Purpose of the Study:
- To investigate the expression patterns of the c-myc oncogene in various stages of anal squamous neoplasia.
- To evaluate the potential of c-myc protein as a biomarker for predicting disease progression in anal squamous neoplasia.
Main Methods:
- Archival specimens of normal anal epithelium, AIN III, and anal squamous cancers were analyzed.
- Immunohistochemical staining using the Myc1-6E10 monoclonal antibody was employed to detect the c-myc gene product, p62.
- A total of 10 normal epithelia, 10 AIN III, and 31 anal squamous cancers were examined.
Main Results:
- Distinct c-myc p62 staining patterns were observed between invasive tumors, normal epithelium, and AIN III.
- 71% of invasive anal tumors (22/31) showed intense, diffuse staining (nuclear and/or cytoplasmic).
- Positively staining invasive tumors were well-differentiated, while negatively staining tumors were poorly or moderately differentiated. Focal, less intense nuclear staining was noted in normal and AIN III tissues.
Conclusions:
- c-myc oncogene expression is involved in the pathogenesis of anal squamous neoplasia.
- Immunohistochemical detection of c-myc protein may serve as a valuable tool for identifying AIN III lesions with a higher likelihood of progressing to invasive disease.