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癌症的治療無論是化療、手術或放療都是對身體有極大負擔，並且在發生惡性轉移後，無論是何種方式都是很難徹底治癒。所以在癌症的治療仍然是人類面對的極大考驗。在目前對於年老的癌症患者，或許找出能維持生活品質並讓其能平靜走向生命旅程的終點的治療方式，會是比積極消除癌細胞而使用副作用極大的治療方式要來的實際且重要。
局部症狀：異常腫塊或腫脹（腫瘤），出血，疼痛和潰瘍。因為腫瘤壓迫周遭組織所引起的症狀，如黃疸。
Human immunodeficiency virus (HIV) does indirectly lead to cancer but it really triggers immune deficiency that will Amplify the chance as a consequence of other infections, occasionally as much as quite a few thousandfold (in the case of Kaposi's sarcoma). Importantly, vaccination versus the hepatitis B virus plus the human papillomavirus happen to be revealed to nearly do away with the risk of cancers caused by these viruses in individuals effectively vaccinated prior to infection.
观察患者有无局部肿块，明确其位置、边界、质地、颜色、疼痛性、活动性等情况。
而根據癌症發展的程度，又可分為零、一、二、三、四期等，及早期與晚期，通常零到一期算是早期，但在不同癌症中每期的定義和治療方法都有所不同，確實的分期仍應參考美國癌症聯合委員會的定義。
全身性的症狀：體重減輕、食欲不振、惡病體質、大量出汗（夜間盜汗）、貧血
Most cancers analysis can result in psychological distress and psychosocial interventions, including speaking therapy, may possibly assist individuals with this.
Big-scale mutations include the deletion or gain of a part of a chromosome. Genomic amplification occurs every time a mobile gains copies (usually twenty or even more) of a little chromosomal locus, usually made up of one or more oncogenes and adjacent genetic materials. Translocation happens when two different chromosomal locations turn out to be abnormally fused, generally at a characteristic location.
許多預防癌症的想法是根據流行病學的研究而來，分析病患的資料可發現生活方式或是接觸一些環境危險因子的確與特定癌症的發生機率相關。越來越多的證據顯示，根據流行病學研究所提出的建議改善，確實可以讓癌症發病率和死亡率降低。
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方法为基础，通过有针对性的国家支持、区域网络和全球行动，支持各国政府提高儿童癌症的存活率；
Contrary to treatment method that's directed at immediately killing most cancers cells, the first target of palliative treatment is to improve Standard of living.
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。