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人和其他哺乳动物,在特定环境下,致癌物质作用于正常细胞的细胞核,使核内遗传物质(DNA)发生变异,细胞将以无规则的异常速度繁殖,由此而形成的新生物(新生细胞群)称为癌症。癌细胞的特征之一是侵袭性生长,因而破坏了邻近器官和组织,如子宫颈癌侵入直肠和膀胱。另一特征是转移性。癌细胞转移到其他部位后,继续生长、繁殖,形成转移癌,进一步威胁机
Humans and other mammals, under certain circumstances, carcinogens act on the nucleus of normal cells, causing genetic material (DNA) in the nucleus to mutate, and the cells will multiply at irregular and irregular speeds, resulting in new organisms (newborns). The cell population) is called cancer. One of the characteristics of cancer cells is invasive growth, which destroys adjacent organs and tissues, such as cervical cancer invading the rectum and bladder. Another feature is metastasis. After the cancer cells have been transferred to other sites, they continue to grow, multiply, and form metastases, further threatening the machine.