Permanent implantation of radioactive particles for brachytherapy (referred to as particle therapy) for tumor treatment is a hot spot that has received widespread attention in the international oncology community in recent years. Foreign applications began in the 1970s and has now become the preferred treatment for early stage prostate cancer in the United States, and only a few clinical applications have been reported in China since 2000. It is mainly applied to lung cancer, liver cancer, breast cancer, malignant black, metastatic cancer of chest and abdominal wall and neck, etc. Radioactive particles are sealed in a miniature titanium shell with a certain dose of radioactive elements (such as 125I) by high technology, and the particle implantation plan is formulated by TPS and implanted into the tumor body by minimally invasive puncture technology, which immediately sends out continuous tumor-killing rays and kills tumor cells day and night with remarkable targeted blasting function. Advantages of particle therapy: 1. One time implantation, long time effect According to the accurate calculation of TPS, it can meet the prescription dose requirement, and the treatment operation can be completed by one time implantation of sufficient amount of particles, and the effect time is more than 3 half-lives (6 months). 2.Minimal trauma, no incision, no wound Percutaneous puncture, low physical requirements for patients, fast recovery, only a few days of hospitalization or no hospitalization. 3.Do not give cancer cells a chance to breathe, the particles send out continuous and uninterrupted low-energy rays to kill cancer cells day and night, after the cancer cells in the value-added stage are killed, other cells in the cycle enter the value-added stage and are killed again, which works repeatedly for up to 6 months to kill cancer cells to the maximum extent, while the slight damage to the surrounding tissues caused by low-energy rays can be repaired at the same time. 4.Accurate calculation and accurate implantation TPS is applied to accurately calculate the position of the particles and the dose of treatment, so that the particles are accurately positioned for safe and effective treatment. 5, high efficiency and low toxicity 125I particles in the tissue killing range of 1.7cm, minimal impact on the surrounding, coupled with the treatment of steep attenuation gradient so that almost no damage to the surrounding normal tissue, almost no nausea, vomiting, hair loss, white blood cell reduction and other adverse reactions, can be carried out at the same time with other methods to achieve the effect of increased efficiency and not increased toxicity, creating an opportunity for comprehensive treatment. 6, low overall cost According to the TPS calculation results of a single implantation of the prescribed dose of the required particles, you can complete the conventional external radiation required 1.5 months of treatment, saving a lot of non-therapeutic costs. Mainly used for: 1.Tumors that are not suitable for surgery, limited metastatic cancer foci, and solid tumors on the body surface can have good effect; 2.Particle implantation can still have good effect for primary tumors that fail to be controlled by radiotherapy and chemotherapy and other anti-cancer methods; 3.Cooperation with radiotherapy, chemotherapy and radiotherapy can significantly reduce the toxic side effects and complications of various therapies and improve the efficacy of comprehensive anti-cancer treatment; 4.Palliative particle implantation can also It can significantly improve the quality of life of elderly patients and advanced tumor patients. 5.Particles can be used for body surface refractory tumors with good effect.