Radiotherapy
Radiation therapy referred to as radiotherapy, it is the use of high-energy electromagnetic radiation effects on living organisms, so that the structural changes of biological molecules to achieve the purpose of destruction of cancer cells as a treatment. Radiation to treat cancer, because cancer cells to radiation-sensitive. At present the clinical application of radiation are X-line treatment, and two kinds of r-line treatment.
The effectiveness of radiation therapy for cancer depends on many factors, such as clinical time, sooner or later, tumor histological types, and its sensitivity to radiation, the patient's overall situation and the circumstances surrounding the tumor are related.
The level of radiation sensitivity of tumors and tumor cell division rate, growth is proportional to speed. The same kind of pathological and radiation sensitivity is inversely proportional to the degree of differentiation, namely, poorly differentiated tumor cells while radiation sensitivity is high and the degree of differentiation, the higher the radiation sensitivity of the low. Therefore, according to the tumor in different clinical response to different doses of radiation can be divided into three categories: one is a radiation-sensitive tumors, often 50 to 60 Gy irradiation, tumor or disappeared, such as lymphoma, seminoma, dysgerminoma and poorly differentiated squamous cell carcinoma,