The process of oncogenesis includes initial mutation, latency, cancer promotion, and progression. The initial mutation refers to the mutation of the cell under the action of the carcinogen, but the mutation does not develop into a tumor without proper environment. This stage is called the incubation period; the cancer promotion refers to the cancer promoter (stimulation of cell growth). The process of proliferation under the action of factors such as hormones, the role of cancer-promoting factors is reversible, if removed, the clones that cause amplification will disappear; evolution means that the tumor becomes more and more invasive during the growth process. The process is irreversible. Tumor formation often involves mutations in many genes that take ten to several decades, and malignant tumors are usually senile diseases.
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