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：
Metastasis is typical within the late levels of cancer and it could occur by using the blood or perhaps the lymphatic method or both. The standard actions in metastasis are:
Disruption of an individual gene could also outcome from integration of genomic material from a DNA virus or retrovirus, resulting in the expression of viral oncogenes in the affected cell and its descendants.
癌症是全球排在第二位的死亡原因。不过，随着癌症筛查、治疗和预防的改进，多种癌症的生存率有所提高。
Most cancers diagnosis can result in psychological distress and psychosocial interventions, like conversing therapy, could assist individuals with this.
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癌症患者治療和研究的進展限於醫師間各自的研究與測試，直到第二次世界大戰時期，許多醫學研究中心發現同一種疾病在不同國家間的發生率差別相當大，也促使各國的公共衛生組織互相通報疾病及流通醫院治療的資料，直到今日仍然是廣為各國採用。日本醫學界觀察到廣島和長崎原子彈受害者的骨髓完全被毀壞。他們認為放射線可能也可用來治療有問題的骨髓，這項發現開啟了使用骨髓移植治療白血病的想法。
A large proportion of cancers are adenocarcinomas, with normal histopathology options shown, Despite the fact that they change significantly from case to case. Cancers are classified by the type of cell which the tumor cells resemble and is consequently presumed for being the origin on the tumor. These forms involve:
第三步——发育不良，除了增殖过度外，粉色细胞的后代在形状和方向上也出现 异常；该组织被称为发育不良。再一段时间过后，一种罕见的改变细胞行为的突变 发生了（紫色）。
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Cancers comprise a 癌症 large family of diseases that contain abnormal mobile expansion Together with the prospective to invade or spread to other portions of the body.
Smaller-scale mutations include position mutations, deletions, and insertions, which can occur inside the promoter location of the gene and affect its expression, or could arise during the gene's coding sequence and change the functionality or stability of its protein item.
Multiple countrywide professional medical rules endorse early palliative look after clients whose cancer has created distressing signs and symptoms or who require help Dealing with their sickness.
Some slow-developing cancers are notably prevalent, but generally are usually not lethal. Autopsy experiments in Europe and Asia confirmed that approximately 36% of individuals have undiagnosed and apparently harmless thyroid most cancers at enough time of their deaths and that eighty% of Gentlemen build prostate cancer by age eighty.