搜尋結果
2024年5月23日 · 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.
Causes of cancer. 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, 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 - 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.
2024年5月17日 · Carcinogen, any of a number of agents that can cause cancer in humans. They can be divided into three major categories: chemical carcinogens (including those from biological sources), physical carcinogens, and oncogenic (cancer-causing) viruses. Most carcinogens, singly or in combination, produce.
- The Editors of Encyclopaedia Britannica
2 天前 · 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.
Studies of large numbers of both familial and sporadic cancers have led to the conclusion that cancer is a disease of successive mutations, acting in concert to deregulate normal cell growth, provide appropriate blood supply to the growing tumour, and ultimately
