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5 天前 · Cancer, group of numerous distinct diseases that are characterized by the uncontrolled multiplication of abnormal cells in the body. Cancer is a major cause of sickness and death worldwide. Learn more about the history of cancer, cancer rates and trends, and the causes, diagnosis, and treatment of cancer.
Cancer - Mutations, Carcinogens, Genetics: Since the 17th century, the field of epidemiology has been responsible for the identification of external agents capable of causing cancer. In the last decades of the 20th century, geneticists isolated internal agents—genetic variations that cause inherited predisposition to specific tumour types.
Cancer - Diagnosis, Treatment, Prevention: Greater insight into the causes and mechanisms of cancer has led to better ways to diagnose and treat the many forms of this disease. First of all, advances in detection have improved the ability to discover cancers earlier and to diagnose them more accurately than was the case only a few years ago.
cancer, Any of a group of more than 100 distinct diseases that are characterized by the uncontrolled multiplication of abnormal cells. Cancerous cells and tissues have abnormal growth rates, shapes, sizes, and functioning. Cancer may progress in stages from a localized tumour (confined to the site of origin) to direct extension (spread into ...
2024年5月4日 · Breast cancer, disease characterized by the growth of malignant cells in the mammary glands. Breast cancer can strike males and females, although women are about 100 times more likely to develop the disease than men. Most cancers in female breasts form shortly before, during, or after menopause.
- The Editors of Encyclopaedia Britannica
The concept that cancer is a specific disturbance of the genes—an idea first proposed by German cytologist Theodor Boveri in 1914—was strengthened as cancer research burgeoned in the 1970s and ’80s.
The many causes of cancer include intrinsic factors, such as heredity, and extrinsic factors, such as environment and lifestyle. Hereditary causes of cancer are less common and are due to the inheritance of a single mutant gene that greatly increases the risk of
