Cancer development is a complex process that involves a variety of factors and mechanisms. Here's a brief overview in English, followed by a translation in Chinese: English Answer: Cancer develops when certain changes, known as mutations, occur in the DNA of cells. These mutations can be triggered by various factors, including: 1. Genetic factors: Some people inherit genes that make them more susceptible to developing cancer. 2. Exposure to carcinogens: These are substances or agents that can cause cancer, such as tobacco smoke, certain chemicals, and radiation. 3. Lifestyle choices: Behaviors like smoking, excessive alcohol consumption, and a diet high in processed foods can increase the risk of cancer. 4. Chronic infections: Some viruses, bacteria, or parasites can increase the risk of developing specific types of cancer. 5. Age: The risk of developing cancer increases as you get older because cells accumulate more mutations over time. 6. Immune system: A weakened immune system may be less able to detect and destroy cancer cells. When cells in the body lose their normal regulatory controls, they can grow and divide without stopping. This uncontrolled growth can lead to the formation of a mass of abnormal cells known as a tumor. Not all tumors are cancerous; benign tumors do not spread to other parts of the body, while malignant tumors can invade nearby tissues and spread to distant organs through the bloodstream or lymphatic system, a process known as metastasis. Chinese Translation: 癌症的发展是一个涉及多种因素和机制的复杂过程。以下是英文简要概述，随后是中文翻译： 中文回答： 癌症的发展是在细胞的DNA中发生了被称为突变的某些变化时发生的。这些突变可能由以下因素触发： 1. 遗传因素：一些人遗传了使他们更容易发展成癌症的基因。 2. 暴露于致癌物：这些是可能导致癌症的物质或因子，例如烟草烟雾、某些化学物质和辐射。 3. 生活方式选择：吸烟、过量饮酒和高加工食品的饮食等行为可以增加患癌症的风险。 4. 慢性感染：某些病毒、细菌或寄生虫可以增加发展特定类型癌症的风险。 5. 年龄：随着年龄的增长，患癌症的风险增加，因为细胞随时间累积了更多的突变。 6. 免疫系统：减弱的免疫系统可能不太能检测和摧毁癌细胞。 当体内的细胞失去了正常的调控能力，它们可以无限制地生长和分裂。这种不受控制的生长可以导致形成一团称为肿瘤的异常细胞。并非所有肿瘤都是癌性的；良性肿瘤不会扩散到身体的其他部分，而恶性肿瘤可以侵入附近的组织，并通过血液或淋巴系统传播到远处的器官，这个过程被称为转移。read more >>

Causes of cancer. Cancer is ultimately the result of cells that uncontrollably grow and do not die. Normal cells in the body follow an orderly path of growth, division, and death. Programmed cell death is called apoptosis, and when this process breaks down, cancer begins to form.read more >>