Radiation therapy is one of the main methods for the treatment of tumors by the different effects and damages of normal cells and tumor cell
Radiation therapy is one of the main methods for the treatment of tumors by the different effects and damages of normal cells and tumor cells in various tissues and organs.
Because the normal tissue is damaged by the radiation, the automatic stability control system begins to play a role, the cell proliferation cycle is shortened, and the cell growth rate is also increased, so that the damaged normal tissue can be repaired quickly. However, the tumor cell group has its own reaction system, which is different from that of the normal tissue, which is different from the normal tissue. In the process of human tumor cells was observed, found significant relationship between cell proliferation and cell loss rate and radiosensitivity, where the average growth rate of the fastest growth rate, and the high rate of tumor cell renewal, is more sensitive to radiation: General embryonal tumors are the most sensitive to radiation; lymphoid tumors again; epithelial tumor; and stromal tumor is most sensitive, require higher doses it may play a role. Due to the normal tissue and tumor tissue automatic stability control system is different, so in the recovery and growth of time after irradiation of normal tissues and tumor tissues are not the same as normal tissue after irradiation, cell cycle recovery time, and tumor tissue damage repair of radiation slow cell cycle extension the irradiated tumor; although there may be a temporary phenomenon of accelerated growth, but the growth rate is less than the normal tissue and to repair the damage of the fast growth rate of proliferation; tumor cell populations within the original than the normal tissue, the cells in the cell cycle, so by the lethal damage more than normal tissue, subject to different degrees of damage than the normal tissue for.
Therefore, in the clinical tumor radiotherapy, the use of normal tissue and tumor tissue, the effect of different radiotherapy, fractionated radiotherapy, to achieve as much as possible to kill tumor cells and protect the normal tissue. In the clinical treatment of tumors, more than 70% of patients with cancer were treated with radiation therapy, including radical radiotherapy and palliative radiotherapy.
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