High Dose Thiotepa in Patients with Relapsed or Refractory Osteosarcomas: Experience of the SFCE Group oleh Perrine Marec-Berard, Céline Segura-Ferlay, Marie-Dominique Tabone, Helene Pacquement, Cyril Lervat, Jean-Claude Gentet, Claudine Schmitt, Nathalie Gaspar, Laurence Brugières