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Telomerase activity in gastric cancer
E Hiyama1, T Yokoyama, N Tatsumoto
1Department of General Medicine, Hiroshima University School of Medicine, Japan.
Cancer Research
|August 1, 1995
Summary
Most gastric cancers (85%) show telomerase activity, linked to advanced stages and shorter survival. Telomerase activation appears crucial for tumor progression, though not universally present in all gastric tumors.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Gastric cancer involves numerous genetic alterations, but tumor immortality mechanisms remain unclear.
- Telomere stabilization and telomerase expression are key to cancer cell immortality.
- Assessing telomerase activity may offer diagnostic and prognostic insights for gastric cancer.
Purpose of the Study:
- To investigate telomerase activity in primary gastric cancers.
- To correlate telomerase activity with clinicopathological features and patient survival.
- To explore the role of telomerase in gastric cancer progression.
Main Methods:
- Analysis of telomerase activity in 66 primary gastric cancer samples using a PCR-based assay.
- Evaluation of telomere length alterations.
- Assessment of cellular DNA content to determine aneuploidy.
Main Results:
- Telomerase activity was detected in 85% of gastric tumors.
- Undetectable telomerase activity was more common in early-stage tumors (8/10).
- Detectable telomerase activity correlated with larger tumor size, advanced stage, metastasis, and significantly shorter patient survival.
- Telomere length alterations and aneuploidy were associated with telomerase activity.
Conclusions:
- Telomerase activation is frequently observed in gastric cancer, often as a late event.
- Telomerase activation may be a critical step in gastric tumorigenesis.
- Telomerase activity serves as a potential prognostic marker for gastric cancer patients.