About Cancer
关于癌症

癌症是一组由细胞异常增生引起的疾病，通常被称为恶性肿瘤。这些异常细胞可以快速生长，侵袭邻近组织，并扩散到身体的其他部位，这一过程被称为转移。

癌症的主要特征包括：

• 不受控制的细胞生长：正常细胞有固定的生长和分裂周期，而癌细胞则失去了这种控制。

• 侵袭性：癌细胞可以侵入并破坏周围的健康组织。

• 转移性：癌细胞可以通过血液或淋巴系统扩散到身体的其他部位。

癌症的成因复杂，通常是多种因素共同作用的结果，包括遗传因素、环境因素（如化学物质、辐射）、生活方式（如吸烟、饮酒）以及某些病毒感染。

Cancer is a group of diseases caused by abnormal cell growth, commonly referred to as malignant tumors. These abnormal cells can grow rapidly, invade nearby tissues, and spread to other parts of the body, a process known as metastasis.

The main characteristics of cancer include:

• Uncontrolled cell growth: Normal cells have a fixed growth and division cycle, while cancer cells lose this control.

• Invasiveness: Cancer cells can invade and destroy surrounding healthy tissues.

• Metastasis: Cancer cells can spread to other parts of the body through the blood or lymphatic system.

The causes of cancer are complex and usually result from a combination of factors, including genetic factors, environmental factors (such as chemicals, radiation), lifestyle factors (such as smoking, drinking), and certain viral infections.