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Stem cell regulation, tissue ontogeny, and oncogenic events.
1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111.
Seminars in Cancer Biology
|June 1, 1992
Summary
The number of cancer-causing events depends on tissue development. Tissues with high cell division require fewer oncogenic events, while those with strict proliferation controls need more for cancer to develop.
Area of Science:
- Oncology
- Developmental Biology
- Cancer Biology
Background:
- Oncogenic events drive cancer development.
- The number of these events varies across different cancer types.
- Tissue ontogeny and stem cell proliferation dynamics are key factors.
Purpose of the Study:
- To investigate the relationship between tissue ontogeny and the number of oncogenic events required for tumor formation.
- To understand how stem cell proliferation controls influence cancer complexity.
Main Methods:
- Comparative analysis of different tissue types and their associated cancers.
- Correlation of oncogenic event numbers with stem cell proliferation characteristics.
- Review of existing literature on tumorigenesis and genetic alterations.
Main Results:
- A minimum of two oncogenic events suffice for tumors arising in tissues with normal stem cell proliferation (e.g., embryonal tumors, leukemias, lymphomas).
- Cancers like those in Li-Fraumeni syndrome, arising in conditionally proliferating tissues, require more events.
- Most complex cancers, such as carcinomas, develop in renewal tissues with tightly controlled stem cell proliferation and necessitate a higher number of oncogenic events.
Conclusions:
- The number of oncogenic events is directly correlated with the level of proliferation control in the target tissue.
- Tissue ontogeny and the regulation of stem cell proliferation are critical determinants of cancer complexity.