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选择某些生活方式会增加患癌风险。抽烟、女性每天饮酒超过一杯、男性每天饮酒两杯以上、过度暴露在阳光下或经常晒伤起疱、肥胖和不安全的性行为都可能导致癌症。
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某些癌症的成長會受某些荷爾蒙的增加或減少而抑制。對荷爾蒙敏感的腫瘤常見的例子有乳癌和前列腺癌，減低或增加體內雌激素或雄激素往往可用來做為補充治療的一種。
肿瘤在其生长过程中，虽然能够暂时通过建立新生血管解决自身给养问题，但是快速的增长一样会将之推向资源和空间匮乏的边缘。隨著腫瘤細胞持續生長，在這樣競爭的壓力下，这时肿瘤就会扩散。而这种肿瘤在生长过程中侵略性不断增加的过程则被称为演进（development）。具体的行为则是生长的加快，并且开始入侵周遭的正常组织（癌症浸润），并且通过血管转移到远端（癌症转移）。
A properly-acknowledged illustration of Here is the Philadelphia chromosome, or translocation of chromosomes nine and 22, which occurs in chronic myelogenous leukemia and ends in production of the BCR-abl fusion protein, an oncogenic tyrosine kinase.
改善乳腺癌控制，减少可避免的乳腺癌死亡，重点关注健康促进、及时诊断和获得医护，以便通过世卫组织全球乳腺癌倡议加快协调的实施工作；
The physician John Hill described tobacco sniffing as the cause of nose cancer in 1761.[229] This was followed by the report in 1775 by British surgeon Percivall Pott that chimney sweeps' carcinoma, a most cancers of the scrotum, was a common ailment among the chimney sweeps.
Employers might also make employing or firing conclusions determined by misconceptions about cancer disabilities, if existing. The EEOC provides interview suggestions for companies, in addition to lists of probable answers for assessing and accommodating employees with cancer.[253]
An additional mutation while in the signaling equipment of your mobile may possibly deliver error-causing signals to nearby cells.
People in the least levels of most cancers therapy commonly acquire some kind of palliative care. In some instances, professional medical specialty Skilled companies propose that individuals and physicians reply to most cancers only with palliative treatment. This is applicable to clients who:[196]
多數癌症是自發性的（英语：sporadic），但是有些癌症還是與遺傳有關，通常遺傳到缺陷的腫瘤抑制基因時會有較顯著的影響和症狀。舉例而言：
用醫學影像技術檢測癌症，也遭遇類似問題。這些醫學影像檢測技術都是成本相當高且耗費時間。由於偵測的靈敏度極高，常發現細胞病變（英语：incidentaloma），這樣的腫瘤也可以被認為惡性，而進行具有潛在危險性的治療方法。
In the 15th, 16th and 17th hundreds of years, it turned appropriate for Physicians to dissect bodies to find the reason for Demise.[229] The German professor Wilhelm Fabry believed that breast cancer was 癌症 attributable to a milk clot in a mammary duct.