Joke Collection Website - Mood Talk - How does cancer form?

How does cancer form?

The formation of cancer is now a two-step theory. Let me briefly describe it to you:

The environment in which people live contains many carcinogens, from ultraviolet rays from the sun to various aspects of daily life. Chemical substances (including free radicals mentioned above), viruses, etc., as well as sequence errors that occur during cell replication, etc. Therefore, cells in a normal human body mutate all the time, but not all of them become cancerous. Mutations are only the first step in the development of cancer.

In addition, most mutations do not cause cancer. Some mutations occur in non-coding regions and will not have any direct impact after the mutation. The other part leads to the death of mutated cells. Only mutations in specific sites of genes that regulate cell growth and differentiation may lead to cancer.

Normal cells have a set of mechanisms inside them to inhibit cancer growth. Once mutated cells are found, the mutated cells can be eliminated in time. Nip cancer in the bud. Only when the tumor suppressor mechanism is also destroyed can mutated cells become cancer cells. Once cancer cells are formed, they may not yet form cancer. Because normal immune surveillance also has a control over cancerous cells. Only when cancer cells escape immune surveillance can they develop into cancer. Therefore, it is a long process from cell mutation to finally becoming clinically diagnosable cancer.

Cancer cells are essentially different from normal cells in all aspects, which is why cancer is difficult to treat. The growth of cancer cells is no longer regulated and controlled by the body (malignant manifestation). The speed of metabolism and growth rate are often much higher than that of normal cells. However, the metabolic pathways they encounter inside are the same as those of normal cells, so specific drugs have been discovered. Very difficult.