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癌症是多种因素长期共同作用引发的基因异常疾病。当机体受到环境中的化学、物理、病毒等致癌物质的影响，和/或因自身遗传、内分泌、性别、年龄等因素的作用时，可发生一系列基因异常改变，形成恶性肿瘤。
Metastasis is frequent from the late levels of most cancers and it could take place by using the blood or the lymphatic system or both of those. The everyday techniques in metastasis are:
Human immunodeficiency virus (HIV) does not directly bring about cancer but it will cause immune deficiency that can Enlarge the risk because of other bacterial infections, at times nearly quite a few thousandfold (in the case of Kaposi's sarcoma). Importantly, vaccination in opposition to the hepatitis B virus and the human papillomavirus are shown to just about eliminate the chance of cancers due to these viruses in persons properly vaccinated prior to infection.
避免暴露于紫外线辐射（这主要源于阳光暴晒和人工晒黑设备)和/或采取防晒措施；
癌症篩檢，是希望在一般大眾身上提早找出潛在未發現與早期無症狀的癌症。所進行的測試必須適合廣大民眾能夠負擔，並且安全，無侵入性而且不易有假陽性結果產生。一旦發現癌症的跡象，更精確的後續檢驗，或使用侵入性手術取得組織切片以確定篩檢結果則是必要的。
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）和砷（一种饮水污染物）；
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Laser therapy utilizes high-depth gentle to take care of most cancers by shrinking or destroying tumors or precancerous growths. Lasers are most commonly applied to take care of superficial cancers which have been around the surface of the human body or even the lining of internal organs. It can be made use of to take care of basal cell pores and skin most cancers and also the very early phases of Some others like cervical, penile, vaginal, vulvar, and non-modest cell lung most 癌症 cancers. It is frequently coupled with other treatment plans, which include surgery, chemotherapy, or radiation therapy.
Palliative treatment can be perplexed with hospice and as a consequence only indicated when folks solution conclude of daily life. Like hospice care, palliative care makes an attempt to help you the affected individual cope with their rapid desires and to extend convenience.
A big proportion of cancers are adenocarcinomas, with normal histopathology attributes revealed, Even though they differ substantially from case to case. Cancers are categorised by the type of mobile the tumor cells resemble and is also hence presumed to get the origin in the tumor. These kinds include:
Which therapies are utilised is determined by the sort, locale and quality of your cancer as well as the affected individual's health and preferences. The remedy intent might or might not be curative.[citation required]
All friends ages thirteen and up carrying costumes and remaining accompanied by a youngster or youngsters under the age of 13 are permitted on zoo grounds to get involved in acceptable zoo-sponsored events through which costumes historically are worn (e.
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。