<qa>  What is the name of the prior chemotherapy regimen for metastatic disease?at least one, but no more than two prior chemotherapy regimen for metastatic disease for osteosarcoma, chondrosarcoma and Ewing sarcoma; neo-adjuvant maintenance therapy are not counted towards this requirement. Chordoma not pretreated or with 1 or 2 prior combination chemotherapy regimen or with one or two prior molecularly targeted therapy, but no more than 2 prior lines of treatment whatever the indication can be included. At least 4 weeks since last chemotherapy 6 weeks in case of nitrosoureas and mitomycin C, immunotherapy or any other pharmacological treatment andor radiotherapy; 