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。
The enhanced idea of molecular biology and mobile biology as a result of cancer exploration has triggered new solutions for most cancers considering that US President Richard Nixon declared the "War on Most cancers" in 1971.
Metastasis is typical from the late levels of most cancers and it could possibly come about by using the blood or even the lymphatic process or both equally. The standard measures in metastasis are:
Conservation is the guts of what the zoo believe in, and get the job done in conservation in 4 groups, in the sector, breeding, sustainability and training
手术主要用于去除瘤灶，达到治疗的目的，同时也适用于癌症的预防、诊断、分期、术后结构重建与功能康复等。
在治疗后数月或数年后发生，有口干、皮肤及皮下组织增厚、神经损伤、心肺功能异常（如干咳、气喘等）、胃肠功能紊乱（如恶心、呕吐、体重下降等）等表现，症状较为严重且长久，应尽量避免。
保持健康体重。超重或肥胖可能增加您患癌症的风险。通过健康饮食和定期运动相结合，努力达到并保持健康体重。
Epigenetic alterations happen routinely in cancers. For instance, 1 study stated protein coding genes that 癌症 were routinely altered within their methylation in association with colon most cancers.
從正常組織到腫瘤組織的形態變化 癌組織在顯微鏡下具有鮮明的外觀，主要是有大量分裂中的細胞、變大的細胞核、細胞大小與形狀改變、失去細胞特化的特徵、失去正常組織結構和細胞間的邊界變的不明顯。免疫組織化學染色法和其他分子生物學標記方法可根據腫瘤細胞的特徵提早發現腫瘤，而有助於診斷和預後。
微量營養素缺乏被認為與癌症有關，但是進行隨機臨床實驗需要眾多人數參與，需時多年才能完成，因此花費也極為昂貴和複雜，所以很少實施。而通常只能以單劑量來做實驗，缺乏其他濃度比較，使得難以評估實際臨床所需的量也是一大問題。
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Which therapies are made use of depends on the type, place and grade of the most cancers as well as the affected individual's well being and Tastes. The treatment intent might or might not be curative.[citation essential]
只有一小部分癌症是由于遗传疾病所致。如果癌症在您的家族中较为常见，则突变可能从一代传给下一代。您可能适合接受基因检测，以确认您是否遗传了可能增加某些癌症风险的突变。请记住，遗传基因突变并不表示肯定会罹患癌症。
Deficient expression of DNA mend proteins as a result of an inherited mutation can maximize cancer challenges. People having an inherited impairment in almost any of 34 DNA repair genes (see article DNA fix-deficiency problem) have enhanced cancer threat, with some defects making sure a a hundred% life time potential for cancer (e.