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Telomerase activity in periampullary tumors correlates with aggressive malignancy
J H Balcom1, T Keck, A L Warshaw
1Department of Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.
Annals of Surgery
|August 29, 2001
Summary
Telomerase activity is prevalent in periampullary carcinomas, with higher levels indicating greater aggressiveness in pancreatic adenocarcinoma. This enzyme
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Telomeres shorten with cell division, signaling senescence.
- Telomerase activity is crucial for maintaining telomere length and cellular immortality.
- Upregulated telomerase is a hallmark of over 80% of cancers, absent in normal tissues.
Purpose of the Study:
- To assess telomerase activity in periampullary malignancies and pancreatic diseases.
- To correlate telomerase activity with tumor stage and aggressiveness.
Main Methods:
- Telomerase activity was measured in 62 periampullary tumors using the telomerase repeat amplification protocol (TRAP).
- Quantitative analysis involved gel electrophoresis, SYBR green staining, and densitometry.
- Fluorometric TRAP assays confirmed findings.
Main Results:
- Telomerase activity was detected in 79% of periampullary carcinomas, including pancreatic adenocarcinomas (81%).
- Higher telomerase activity correlated with poor differentiation, larger tumor size (>2 cm), and lymph node metastasis in pancreatic cancer.
- Intraductal papillary mucinous tumors showed activity only in invasive foci; benign conditions lacked activity.
Conclusions:
- Telomerase activity is a frequent finding in periampullary carcinomas.
- The level of telomerase activity is linked to the aggressiveness of pancreatic adenocarcinoma.
- Telomerase may serve as a valuable molecular marker for biologic staging.