癌症是以异常细胞生长为特征的众多疾病的统称，这些异常细胞会失控地分裂，并能浸润和毁坏正常身体组织。癌症通常可以扩散到全身各处。
癌症是一组可影响身体任何部位的多种疾病的通称。使用的其它术语为恶性肿瘤和赘生物。癌症的一个决定性特征是异常细胞快速生成，这些细胞超越其通常边界生长并可侵袭身体的临近部位和扩散到其它器官。后者被称为转移。广泛转移是癌症死亡的主要原因。
Some option therapies have been investigated and proven being ineffective but nevertheless continue on for being promoted and promoted. Most cancers researcher Andrew J. Vickers mentioned, "The label 'unproven' is inappropriate for this sort of therapies; it truly is time to assert that many substitute cancer therapies have been 'disproven'."[204]
大脑和神经系统问题。癌症会压迫到附近的神经，导致身体某一部位疼痛和丧失功能。累及大脑的癌症可能导致头痛和卒中样体征和症状，例如身体一侧无力。
另一方面，現在有些方法則是想利用身體本身的免疫系統產生非專一性的免疫反應來對抗癌細胞，例如卡介苗膀胱內灌注免疫療法（英语：intravesical BCG immunotherapy）將卡介苗灌注進入膀胱內，以引發免疫反應對抗表淺性膀胱癌（英语：superficial bladder most cancers）。此外使用干擾素和介白質素，均可引起免疫反應。而使用疫苗所產生的免疫反應來對抗腫瘤的研究也正在進行當中，尤其是針對惡性黑色素瘤與腎細胞腫瘤（英语：renal cell carcinoma））。
Operation is the main technique of treatment method for the majority of isolated, stable cancers and should Perform a role in palliation and prolongation of survival. It is often a very important Element of the definitive prognosis and staging of tumors, as biopsies are usually demanded.
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。
局部症狀：異常腫塊或腫脹（腫瘤），出血，疼痛和潰瘍。因為腫瘤壓迫周遭組織所引起的症狀，如黃疸。
Inside the seventies, a comparatively preferred alternative cancer remedy in the US was a specialized method of converse therapy, based on the idea that cancer was attributable to a nasty Mind-set.[244] Those with a "most cancers identity"—frustrated, repressed, self-loathing and fearful to precise their feelings—were being thought to get manifested cancer via subconscious need. Some psychotherapists claimed that cure to change the client's outlook on everyday living would overcome the cancer.[244] Amongst other outcomes, this belief authorized Culture guilty the victim for possessing brought on the most cancers (by "wanting" it) or owning prevented its heal (by not turning into a sufficiently happy, fearless and loving individual).
畸胎瘤是性腺或胚胎剩件中的全能细胞发生的肿瘤，常发生于性腺，一般含有两个以上胚层的成分，结构混乱，也有良性和恶性之分。
书籍：《妙佑医疗国际家庭健康手册》 书籍：《活得更年轻、更长久》 妙佑医疗国际商店的各种药片辅助工具 简报：妙佑医疗国际卫生来信 — 数字版 显示更多来自妙佑医疗国际的产品和服务
There exists an association among celiac disorder and a heightened risk of all cancers. Individuals with untreated celiac condition have an increased possibility, but this chance 癌症 decreases with time immediately after analysis and demanding procedure. This can be due to adoption of a gluten-absolutely free eating plan, which would seem to have a protecting part against the event of malignancy in those with celiac disorder.
Deficient expression of DNA mend proteins due to an inherited mutation can boost cancer dangers. Persons by having an inherited impairment in almost any of 34 DNA mend genes (see write-up DNA repair-deficiency ailment) have greater cancer possibility, with some defects making certain a one hundred% life span potential for most cancers (e.
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；