良性腫瘤指腫瘤細胞未發生轉移與侵入周遭組織的情形，反之則稱為惡性腫瘤，多數會影響生理功能的腫瘤都是惡性腫瘤。
[238] Persons from Asian and South American countries also often desire a slower, fewer candid method of disclosure than is idealized in The usa and Western Europe, they usually feel that in some cases it would be preferable never to be instructed a couple of cancer analysis.[238] Generally speaking, disclosure of your prognosis is more typical than it was in the twentieth century, but entire disclosure in the prognosis just isn't provided to many people throughout the world.[238]
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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。
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[one hundred and five] Each individual of such alterations regulates gene expression without having altering the fundamental DNA sequence. These adjustments may continue being through mobile divisions, endure for a number of generations, and will be considered as reminiscent of mutations.
Regional signs and symptoms may come about as a result of mass of the tumor or its ulceration. One example is, mass effects from lung cancer can block the bronchus resulting in cough or pneumonia; esophageal most cancers can result in narrowing with the esophagus, rendering it hard or painful to swallow; and colorectal cancer may perhaps bring about narrowing or blockages in the bowel, influencing bowel routines. Masses in breasts or testicles may possibly deliver observable lumps.
神經膠質瘤：由神經膠質細胞變化成腫瘤，神經膠質細胞也是最主要的一種腦細胞類型。
化学致癌物，例如石棉、烟草烟雾成分、酒精、黄曲霉毒素（一种食品污染物）、 砷（一种饮水污染物）、烷化剂、酰化剂、亚硝胺类、芳香胺、环氧化物等；巴豆油、 激素、酚类等物品，会增加致癌物质的效应。
癌細胞擴散至距離原始腫瘤遙遠的器官及組織。此時癌細胞流竄於全身，必需借助循環全身的化學治療藥物治療。安寧照護將是治療選項之一。
If a human could Are living prolonged sufficient, it is actually inevitable that not less than among his / her cells would sooner or later accumulate a list of mutations ample for cancer to produce. ^
If an important error takes place, the harmed cell can self-destruct through programmed cell death, termed apoptosis. Should the error Manage procedures fail, then the mutations will endure and become passed together 癌症 to daughter cells.