Gemcitabine plus sirolimus for relapsed and progressing osteosarcoma patients after standard chemotherapy: a multicenter, single-arm phase II trial of Spanish Group for Research on Sarcoma (GEIS)

This work was funded by the Ministry of Health, Social Policy and Equality of Spain, through a public competitive call (project reference EC11-444) and by the Spanish Group for Research on Sarcoma (GEIS), which sponsored the trial (no grant numbers apply).