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Telomerase activity in human proliferative breast lesions
C Poremba1, W Böcker, H Willenbring
1Gerhard-Domagk-Institute of Pathology, Domagkstrasse 17, University of Munster, D-48149 Munster, Germany.
International Journal of Oncology
|April 18, 1998
Summary
Telomerase activity is a key indicator in breast cancer, detected in 90% of invasive carcinomas but absent in normal tissues. This suggests telomerase reactivation is an early event in breast cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Telomerase counteracts telomere shortening, enabling unlimited cancer cell proliferation.
- Understanding telomerase's role in breast carcinogenesis is crucial for diagnosis and prognosis.
Purpose of the Study:
- To detect and quantify telomerase activity in various breast tissue types.
- To assess the correlation between telomerase activity and breast cancer characteristics.
Main Methods:
- Utilized a non-radioactive telomeric repeat amplification protocol (TRAP) assay.
- Analyzed 98 frozen sections of normal, benign, and malignant breast tissues.
- Employed an automated laser-fluorescence sequencer for semiquantitative analysis.
Main Results:
- Telomerase activity detected in 90% of invasive breast carcinomas; absent in normal and benign hyperplastic tissues.
- Activity found in 59% of ductal in situ carcinomas, indicating early reactivation.
- Positive correlation between telomerase activity and MIB1-defined cell proliferation.
Conclusions:
- Telomerase reactivation is an early event in breast carcinogenesis.
- Telomerase activity is a sensitive marker for malignancy but requires careful interpretation in benign lesions like fibroadenomas.