Anti-angiogenesis Tyrosine kinase inhibitors (TKIs) have been proved to show promising effects on prolonging progression-free survival (PFS) for advanced chondrosarcoma after failure of standard multimodal Therapy. Methylsulfonic apatinib is one of those TKIs which specifically inhibits VEGFR-2. This study summarizes the experience of two Peking University affiliated hospitals in off-label use of apatinib in the treatment of extensively pre-treated chondrosarcoma.

Inclusion Criteria:

• 1) histologically confirmed high-grade sarcoma;
• 2) initial treatment in the orthopedic oncology departments of the two affiliated hospitals of Peking University;
• 3) tumors not amenable to curative treatment or inclusion in clinical trials;
• 4) unresectable local advanced lesions or multiple metastatic lesions that could not be cured by local therapy;
• 5) measurable lesions according to Response Evaluation Criteria for Solid Tumors (RECIST1.1) ;
• 6) Eastern Cooperative Oncology Group performance status 0 or 1;
• 7) acceptable hematologic, hepatic, and renal function.

Exclusion Criteria:

• had central nervous system metastasis;
• had other kinds of malignant tumors at the same time; had cardiac insufficiency or arrhythmia;
• had uncontrolled complications such as diabetes mellitus, coagulation disorders, urine protein ≥ ++ and so on;
• had pleural or peritoneal effusion that needs to be handled by surgical treatment;
• combined with other infections or wounds;
• pregnant or breastfeeding.