9.14
Cancer Prevention
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Q1: What role do inherited genetic mutations play in cancer development?
Inherited genetic mutations account for approximately 5 to 10 percent of all cancers. Parents with cancer-causing mutations can pass these to their children, predisposing them to cancer. Genetic testing helps individuals assess their cancer risk and determine appropriate screening and prevention strategies for managing hereditary cancer.
Q2: How do tobacco smoke chemicals cause DNA damage and cancer?
Polycyclic aromatic hydrocarbons (PAHs) in tobacco smoke react with metabolic enzymes in pulmonary cells, creating reactive metabolites that directly interact with DNA and induce genetic mutations. Such DNA damage can ultimately lead to tumorigenesis. This mechanism demonstrates how environmental chemical exposure increases cancer risk.
Q3: What lifestyle changes can reduce cancer incidence?
About 50 percent of cancer cases can be prevented through healthy lifestyle choices including regular exercise, balanced diet, and weight management. Populations with vegetable and fruit-rich diets show reduced cancer incidence, while those consuming processed meat, animal fat, and high-calorie foods face increased risk. Daily exercise and proper nutrition are key preventive strategies.
Q4: How do plant compounds like flavonoids help prevent cancer?
Flavonoids and isoflavonoids are secondary plant metabolites with anti-cancer properties found in vegetables, fruits, and legumes like soybeans. These phytochemicals prevent cancer by inhibiting cell cycle progression, reducing oxidative stress, inducing detoxification enzymes, stimulating immune response, and triggering apoptosis in abnormal cells.
Q5: Why does physical activity reduce breast and colon cancer risk?
Regular exercise increases food movement through the intestine, reducing bowel lining exposure to mutagens and lowering colon cancer risk. Rigorous physical activity decreases circulating estrogen exposure to breast tissue, reducing breast cancer risk. Exercise also helps control obesity, which is associated with increased risk of multiple cancer types.
Q6: How can viral infections be prevented to reduce cancer risk?
Viruses like Hepatitis B and Epstein-Barr can weaken immune systems, damage DNA, or introduce oncogenes into host cells, causing cancer. Virus-associated cancers can be prevented through avoiding exposure to these pathogens or receiving immunization against them, providing effective protection strategies.
Q7: What environmental exposures require protective measures to prevent cancer?
Prolonged UV radiation exposure causes skin cancer and can be prevented by reducing sun exposure and avoiding tanning booths. Industrial chemicals like asbestos require appropriate protective equipment (PPE) to prevent or reduce exposure. Taking preventive steps against environmental carcinogens significantly reduces cancer development risk.