What is the success rate of mammosite radiation?

Could you elaborate on the success rate of mammosite radiation, please? How effective is it in treating breast cancer, specifically? Are there any studies or research that have been conducted to determine its efficacy compared to other forms of radiation therapy? Additionally, are there any potential risks or side effects associated with this type of radiation therapy that patients should be aware of? Understanding these factors would be crucial in making an informed decision about treatment options.