Patient: The site of the disease is the posterior end of the humerus of the right shoulder. The first benign mass was found in February, and after scraping surgery, the tumor recurred in June and became malignant, and the first chemotherapy in September was not effective due to insufficient dose, and the tumor has increased in size. How long can I live? Doctor: There is something unclear in your description. Parosteal osteosarcoma is a kind of osteosarcoma, which usually does not need chemotherapy, but only the degenerative or highly malignant tumors need chemotherapy. Pathological fractures do not indicate what stage the tumor has progressed to, but can have an impact on limb preservation. Although it may all be osteosarcoma, each person will have their own situation. You do not have any imaging treatment, so I cannot give you further answer. It is recommended that you be treated at a bone tumor specialist.