我的一些关于肿瘤的观点

sunsong7

不大同意上述定义， Wikipedia的定义如下：0 e# L% T& @  J8 u: \7 N# d
Cancer i/ˈkænsər/, known medically as a malignant neoplasm, is a broad group of various diseases, all involving unregulated cell growth. In cancer, cells divide and grow uncontrollably, forming malignant tumors, and invade nearby parts of the body. The cancer may also spread to more distant parts of the body through the lymphatic system or bloodstream. Not all tumors are cancerous. Benign tumors do not grow uncontrollably, do not invade neighboring tissues, and do not spread throughout the body. There are over 200 different known cancers that afflict humans.[1]
) p4 e4 c0 Y! y6 w$ Z0 \1 I2 hDetermining what causes cancer is complex. Many things are known to increase the risk of cancer, including tobacco use, certain infections, radiation, lack of physical activity, obesity, and environmental pollutants.[2] These can directly damage genes or combine with existing genetic faults within cells to cause the disease.[3] Approximately five to ten percent of cancers are entirely hereditary.

sunsong7

回复 饶冠华 的帖子
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6 T/ k6 f5 k+ d' w  W$ [; Q我比较倾向于接受将癌定义为“neoplasm”（赘生物、新生物）而不是简单的“ proliferation”（增生）。

sunsong7

饶冠华 发表于 2013-2-28 15:04
# m) B6 @+ h6 C! Y" X- E回复 zb_ming 的帖子
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我个人观点并不觉得肿瘤细胞是一种新生物，看上去反而更像一种由正常细胞各种功能 杂 ...

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肿瘤的基因型/表型/行为均与体细胞不同,因此可被认为是"新生物".

sunsong7

回复 pujixing 的帖子
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老狼以为求得永生为细胞的本能， 癌细胞挣脱了分化和死亡宿命而返回到单细胞生存状态永生细胞。6 t, u6 x, H3 i
癌细胞的发生可能是一种“返祖”现象？http://www.stemcell8.cn/thread-32073-1-1.html
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