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Allelotype analysis of early colorectal cancers with lymph node metastasis
T Arai1, Y Akiyama, A Yamamura
1First Department of Surgery, Tokyo Medical and Dental University School of Medicine, Japan.
International Journal of Cancer
|August 12, 1998
Summary
Frequent allelic losses on chromosomes 8p and 18q are linked to lymph node metastasis in early colorectal cancer (CRC). These chromosomal regions may harbor tumor suppressor genes crucial for CRC progression and metastatic potential.
Area of Science:
- Oncology
- Genetics
- Cancer Research
Background:
- Colorectal cancer (CRC) progression is associated with allelic losses in specific chromosomal regions.
- Early-stage CRCs with positive lymph nodes are highly malignant and possess metastatic capabilities.
Purpose of the Study:
- To investigate the correlation between allelic losses and metastatic potential in early colorectal cancer.
- To identify chromosomal regions associated with lymph node metastasis in pT1 CRC tumors.
Main Methods:
- Analysis of loss of heterozygosity (LOH) using microsatellite markers on chromosomes 1p, 8p, 14q, 18q, and 22q.
- Examination of 19 lymph node-positive and 20 lymph node-negative early CRC specimens.
- Immunohistochemical staining for p53 protein expression.
Main Results:
- Significant association between LOH at 8p21-22 (57.9%) and 18q21 (89.4%) and lymph node metastasis in early CRC.
- Allelic losses in regions 8p21-22 and 18q21 were significantly more frequent in node-positive than node-negative tumors (p < 0.01).
- No significant correlation found between LOH at 1p, 14q, 22q, or p53 expression and lymph node metastasis.
Conclusions:
- Putative tumor suppressor genes involved in CRC metastasis are likely located on chromosomes 8p21-22 and 18q21.
- Allelic losses in these specific chromosomal regions are potential risk factors for lymph node metastasis in early colorectal cancer.