I just read about 3 studies on osteosarcoma that are currently being conducted at UW-Madison. I hadn't heard of the first (administration of rapamycin after carboplatin), so that's interesting. Also, if you're in the Madison area and qualify for one of these studies, it could help offset the cost of surgery and/or treatment.
For more information, see https://uwveterinarycare.wisc.edu/clinical-studies/oncology/