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Cancer prevention: past, present, future
1National Cancer Center, 1-1, Tsukiji 5-chome, Chuo-ku, Tokyo 104, Japan.
Abstract:
There are many examples of different types of cancers that have been prevented by appropriate measures in the past. Most of them were related to occupational, iatrogenic or accidental factors, often as the outcome of heavy exposure of humans to specific carcinogenic agents. Cancer is a disease of DNA, and is generally associated with multiple genetic alterations, these being produced in the typical case by exposure to various carcinogens, each of which exists at minute concentrations. Thus, the impact of carcinogenic factors, xenobiotics and autobiotics, is due to their actions in concert. However, a single mutation yielding genomic instability exerts a disproportionately large influence by resulting in a large number of secondary mutational events. Epigenetic changes can also not be disregarded especially from the view point of prevention of neoplasia. The occurrence of multiple primary cancers among survivors of initial primaries, and the presence of hereditary groups with a high risk of cancer development provide a strong stimulus for establishment of effective approach for cancer prevention, which should be, in principle, multi-faceted. Therefore, a holistic approach is essential with improvement in life style including choosing a balanced diet and avoidance of cigarette smoking and other sources of carcinogens, as integral elements.
Insights
Cancer prevention is achievable through multifaceted strategies, including lifestyle changes like balanced diets and avoiding carcinogens. Understanding cancer as a DNA disease highlights the importance of addressing genetic alterations and epigenetic factors for effective prevention.
Area of Science:
- Oncology
- Genetics
- Epigenetics
- Preventive Medicine
Background:
- Cancer is a complex disease primarily involving DNA alterations, often resulting from cumulative exposure to various carcinogenic agents.
- Past cancer prevention successes often targeted occupational, iatrogenic, or accidental exposures to specific carcinogens.
- Understanding the synergistic effects of multiple carcinogens and the impact of genomic instability is crucial for cancer prevention.
Purpose of the Study:
- To emphasize the necessity of a multi-faceted and holistic approach to cancer prevention.
- To highlight the role of lifestyle modifications in mitigating cancer risk.
- To underscore the significance of addressing genetic and epigenetic factors in neoplasia prevention.
Main Methods:
- Review of historical cancer prevention successes related to specific exposures.
- Analysis of cancer as a DNA disease involving multiple genetic alterations and synergistic carcinogen effects.
- Consideration of genomic instability and epigenetic changes in cancer development.
- Examination of hereditary cancer predispositions and multiple primary cancers in survivors.
Main Results:
- Cancer development is linked to cumulative genetic alterations, influenced by combined exposures to carcinogens (xenobiotics and autobiotics).
- Genomic instability, initiated by a single mutation, can disproportionately accelerate cancer progression by causing numerous secondary mutations.
- Epigenetic modifications play a significant role in neoplasia development and prevention.
Conclusions:
- Effective cancer prevention requires a comprehensive, multi-faceted strategy.
- Lifestyle improvements, including balanced nutrition and avoidance of smoking and other carcinogens, are integral to cancer prevention.
- A holistic approach integrating genetic, epigenetic, and environmental factors is essential for successful cancer prevention.