癌症有超過一百個種類，一般可依據癌細胞原發部位來分類，例如肺癌、乳癌等；另外能根據不同組織或細胞做以下分類：
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The enhanced knowledge of molecular biology and cellular biology on account of cancer research has triggered new treatments for most cancers since US President Richard Nixon declared the "War on Most cancers" in 1971.
註解：癌細胞將於所到之處繼續失控的繁殖。舉例：若肺癌細胞轉移到肝臟，則肝臟將出現不斷增生的肺部細胞（不具肺功能），且此細胞具有入侵正常肝臟細胞的能力，導致肝功能不斷降低；反之，不具入侵能力但失控繁殖的細胞，稱為良性腫瘤。
上述中各種症狀都有可能由其他的疾病引起，癌症不一定是產生這些症狀的主因，確切原因仍需要鑑別診斷診察。
第五步——浸润性癌，如果基因变化使肿瘤开始侵入下层组织，并使细胞脱落到血液或淋巴中， 则认为肿瘤已变成恶性肿瘤。癌变的细胞很可能在全身形成新的肿瘤（转移）；这些可能会因破坏重要器官而致命。
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The physician John Hill described tobacco sniffing as the reason for nose most cancers in 1761.[229] This was followed by the report in 1775 by British surgeon Percivall Pott that chimney sweeps' carcinoma, a cancer on the scrotum, was a standard illness between chimney sweeps.
Experimental most cancers treatment plans are examined in medical trials to check the proposed remedy to the top existing therapy.
An extra mutation inside the signaling equipment from the mobile might 癌症 ship mistake-leading to alerts to close by cells.
例如，如果您遗传了一种使您易患癌症的基因突变，并不意味着您一定会患癌症。可能需要有一个或多个其他基因突变才会引起癌症。当您接触某种致癌物质时，您的遗传基因突变可能使您比其他人更容易患癌症。
A mutation from the mistake-correcting machinery of a mobile may well bring about that cell and its young children to build up problems additional promptly.
有些恶性肿瘤，并不被称为癌或肉瘤，而是以“恶性……瘤”的名词出现，如恶性黑色素瘤。
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；