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[Oncogenes in human gastric carcinoma]
1Dept. of Pathology, Hiroshima University School of Medicine.
Gan to Kagaku Ryoho. Cancer & Chemotherapy
|June 1, 1989
Summary
Oncogene alterations are rare in gastric cancer. Specific gene amplifications like c-erbB-2 and sam correlate with tumor differentiation, while stromal c-myc expression impacts patient prognosis.
Area of Science:
- Molecular oncology
- Gastrointestinal cancer research
Context:
- Gastric carcinoma exhibits distinct genetic alterations compared to other gastrointestinal cancers.
- Understanding oncogene involvement is crucial for diagnosing and treating gastric cancer.
Purpose:
- To investigate the frequency and significance of oncogene alterations and gene amplifications in human gastric carcinoma.
- To explore the correlation between specific gene expressions (c-erbB-2, sam, TGF alpha, ras p21, c-myc, c-fos) and gastric cancer's biological malignancy and prognosis.
Summary:
- Oncogene alterations and chromosomal heterozygosity loss are infrequent in gastric carcinoma.
- Amplification of c-erbB-2 is linked to well-differentiated adenocarcinoma, while sam gene amplification is found in poorly differentiated or scirrhous carcinoma.
- Synchronous expression of TGF alpha and ras p21 correlates with malignancy; stromal c-myc and c-fos expression, particularly c-myc p62 positivity, influences patient prognosis.
- Coamplification of hst-1 and int-2 is noted in esophageal carcinoma.
- Polymerase chain reaction (PCR) shows utility in detecting oncogene point mutations in gastric carcinoma.
Impact:
- Identifies specific oncogenes and their expression patterns as potential biomarkers for gastric cancer diagnosis, differentiation, and prognosis.
- Highlights the role of stromal cell interactions in tumor behavior and patient outcomes.
- Suggests PCR as a valuable tool for molecular diagnostics in gastric cancer.