The best Side of 癌症

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：

Genetic variations can come about at distinct concentrations and by distinct mechanisms. The attain or loss of an entire chromosome can occur by means of problems in mitosis. Far more widespread are mutations, which might be alterations while in the nucleotide sequence of genomic DNA.

维基百科中的醫學内容仅供参考，並不能視作專業意見。如需獲取醫療幫助或意見，请咨询专业人士。詳見醫學聲明。

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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。

這種擴散會使治療複雜化，因為轉移性癌症需要更密集和全身的方法。 癌細胞通常通過以下方式擴散：

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 functions shown, Though they range significantly from circumstance to case. Cancers are categorised by the type of cell the tumor cells resemble and is thus presumed to get the origin on the tumor. These styles include:

Reduced expression of DNA repair service genes disrupts DNA repair. This is certainly shown from the determine at the 4th stage from your best. (From the determine, red wording indicates the central purpose of DNA damage and defects in DNA repair service in the progression to cancer.) When DNA maintenance is deficient DNA destruction continues to be in cells at a higher than normal degree (5th amount) and causes amplified frequencies of mutation and/or epimutation (sixth stage).

因p53突變而引起的李佛美尼症候群，會產生多種腫瘤，包含骨肉瘤、乳癌、軟組織肉瘤、腦瘤。

一些最常见的癌症类型，如乳腺癌、宫颈癌、口腔癌和结肠直肠癌等，如能早期发现并根据最佳做法进行治疗，治愈概率很高。

People that report an increased Standard of living tend to outlive lengthier.[209] People with lower quality of life might be impacted by depression as well as other issues and/or sickness development that both equally impairs high-quality and amount of daily life. Moreover, sufferers with worse prognoses may be frustrated or report poorer quality of life since they understand that their affliction is likely to get 癌症 fatal.[citation required]

Taller people have an increased chance of most cancers mainly because they have far more cells than shorter people. Because height is genetically determined to a large extent, taller people have a heritable rise in cancer danger.[88]

虽然医生知道哪些因素会增加患癌风险，但大多数癌症会发生于没有任何已知导致癌症的风险因素的人身上。可导致癌症风险增加的已知因素包括：