Related Experiment Videos
Clonal analysis of human colorectal tumors
E R Fearon1, S R Hamilton, B Vogelstein
1Oncology Center, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Science (New York, N.Y.)
|October 9, 1987
Summary
Human colorectal tumors, including adenomas and carcinomas, originate from a single cell (monoclonal origin). Loss of chromosome 17p sequences is linked to cancer progression.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Understanding the cellular origins of colorectal tumors is crucial for diagnosis and treatment.
- Human colorectal neoplasms encompass a spectrum from benign adenomas to malignant carcinomas.
Purpose of the Study:
- To investigate the clonal origin of human colorectal tumors.
- To identify chromosomal alterations associated with tumor progression.
Main Methods:
- Utilized restriction fragment length polymorphisms (RFLPs) to analyze X chromosome inactivation patterns in female tumors.
- Employed autosomal RFLPs as clonal markers to detect somatic chromosomal sequence loss or gain.
Main Results:
- All 50 studied colorectal tumors (20 carcinomas, 30 adenomas) exhibited monoclonal X chromosome inactivation patterns.
- Somatic loss of chromosome 17p sequences was observed in over 75% of carcinomas but rarely in adenomas.
Conclusions:
- Colorectal neoplasms arise from a monoclonal origin.
- Loss of chromosome 17p sequences may be a key event in the progression from benign adenomas to malignant carcinomas.