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癌症扩散。随着癌症进展，它可能扩散（转移）到身体其他部位。癌症扩散到哪里取决于所患癌症的类型。
Upper body X-ray exhibiting lung cancer inside the left lung Most cancers are at first recognized possibly as a result of visual appearance of indicators or indications or through screening.[one hundred twenty five] Neither of such causes a definitive analysis, which calls for the examination of the tissue sample by a pathologist.
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。
观察患者有无局部肿块，明确其位置、边界、质地、颜色、疼痛性、活动性等情况。
Observer l’agitation des échoppes et des temples cachés dans les ruelles animées de Chinatown. Admirer le Bouddha couché du Wat Pho avant de grimper au sommet de la Tour Baiyoke II, pour un panorama vertigineux sur la ville.
DNA repair inhibition is proposed to become a predominant mechanism in hefty metal-induced carcinogenicity. Additionally, Regular epigenetic alterations in the DNA sequences code for modest RNAs identified as microRNAs (or miRNAs). miRNAs never code for proteins, but can "focus on" protein-coding genes and lower their expression.
这里需要注意另外一个概念——肿瘤。肿瘤是局部组织细胞增生所形成的新生物。 肿瘤分为良性肿瘤和恶性肿瘤两大类。良性肿瘤不会扩散或侵入附近组织。切除后， 良性肿瘤通常不会再长出来，而恶性肿瘤有时会。然而，良性肿瘤的体积有时可能 很大，有些会引起严重的症状或危及生命，比如脑部的良性肿瘤。恶性肿瘤可分为 癌和肉瘤，癌是指来源于上皮组织的恶性肿瘤。癌性肿瘤会扩散或侵入附近的组织， 并可以扩散到身体的远处形成新的肿瘤(这一过程称为转移)。许多癌症形成实体瘤， 但白血病是血液癌症不会形成实体瘤。如果还是没能理解肿瘤和癌症的关系，可以看 下图。在后续的文章中我们将针对各类不同的癌症进行深入的讨论与分析。
癌症會根據發生的部位，有不同前兆或症狀，但這些前兆也可能由其他疾病引起，因此，如果以下症狀持續數週都沒有改善，請前往醫院進行檢查。
Complementary and choice cancer therapies are a various team of therapies, procedures and products which usually are not part of traditional medication.[202] "Complementary medication" refers to methods and substances employed coupled with standard medicine, although "substitute drugs" refers to compounds used as an alternative to common drugs.[203] Most complementary and alternative medicines for most cancers haven't been analyzed or examined employing regular procedures which include scientific trials.
[238] People from Asian and South American international locations also usually choose a slower, a lot less candid method of disclosure than is idealized in America and Western Europe, they usually feel that occasionally It might be preferable not to be advised about a cancer diagnosis.[238] In general, disclosure from the diagnosis is a lot more popular 癌症 than it absolutely was during the twentieth century, but comprehensive disclosure with the prognosis will not be available to quite a few sufferers around the globe.[238]
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Businesses can also make using the services of or firing decisions based upon misconceptions about cancer disabilities, if present. The EEOC offers job interview pointers for companies, and lists of attainable methods for assessing and accommodating staff with cancer.[253]