癌症是一组可影响身体任何部位的多种疾病的通称。使用的其它术语为恶性肿瘤和赘生物。癌症的一个决定性特征是异常细胞快速生成，这些细胞超越其通常边界生长并可侵袭身体的临近部位和扩散到其它器官。后者被称为转移。广泛转移是癌症死亡的主要原因。
癌症的常用治疗方式包括外科手术、化疗、放疗等，必要时也会结合靶向治疗、生物治疗等方法。治疗后的预后取决于癌症的种类、阶段、患者的一般健康状况等因素。癌症的预防主要依赖于健康的生活方式，如均衡饮食，积极锻炼，避免烟草和过度饮酒，定期检查等。
現代人工作忙碌，飲食習慣差，多為外食、重口味並常延遲用餐，加上生活壓力大、熬夜、作息不穩定，以及長期久坐、缺乏運動等，這些不良生活習慣都會增加罹癌風險。
Most cancers screening is just not available for numerous varieties of cancers. Regardless if checks are offered, they might not be encouraged for everyone. Common screening or mass screening consists of screening everyone.
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乙肝病毒、丙肝病毒和某些类型的人乳头瘤病毒可分别增加罹患肝癌和宫颈癌的危险。艾滋病毒感染会使患宫颈癌的风险增加六倍，并还会大幅增加患其他癌症，如卡波西肉瘤的风险。
The zoo also has a wonderful butterfly garden with practically 500 free of charge flying butterflies, and excellent displays which will teach Young children about conservation far too, like the Banyan Wilds, wherever the forests of Asia arrive at life with tigers and sloth bears.
Epigenetic alterations occur regularly in cancers. For example, 癌症 just one study detailed protein coding genes that were usually altered of their methylation in Affiliation with colon most cancers.
您可以通过改变这些习惯来降低患癌风险，尽管有些习惯比其他习惯更难改变。
Radiation could potentially cause most cancers in many elements of the body, in all animals and at any age. Children are 2 times as prone to build radiation-induced leukemia as adults; radiation publicity just before birth has 10 instances the effect.[seventy six]
准确诊断癌症对采取适当有效的治疗措施必不可少，因为每种癌症类型都需要特定的治疗方案。治疗通常包括手术、放疗和/或全身性治疗（化疗、激素治疗、靶向生物治疗）。适当选择治疗方案既要考虑癌症又要考虑接受治疗的个体情况。在限定时间内完成治疗方案对于实现预期的治疗效果很重要。
筛查规划根据年龄和风险因素来选择患者，以避免进行过多假阳性研究。筛查方法的例子包括：
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如果能早期发现和治疗病例，则可降低癌症死亡率。早期发现包括两个部分，即：早期诊断和筛查。