Metronomic Chemotherapy in Patients With Advanced Solid Tumor With Bone Metastasis and Advanced Pretreated Osteosarcoma

"Cyclophosphamide, Methotrexate and Sirolimus will be administrated orally. Zoledronic Acid will be administrated by infusion (IV).~Trial based on a dose escalating study design assessing two dose levels of sirolimus when prescribed in combination with metronomic cyclophosphamide (CP), methotrexate (MT) and zoledronic acid (ZA) followed by an expansion cohort once the MTD is established."