Treatment of recurrence of osteosarcoma in children. 32ND ANNUAL MEETING OF THE EUROPEAN MUSCULO SKELETAL ONCOLOGY SOCIETY. FLORENCE, ITALY MAY 15-17, 2019 PALAZZO DEI CONGRESSI. Vadym Kobys , Sergej Savertulenko , Vladymyr Konovalenko , Oksana Ivasuk , Olja Matuschok , Oleg Nesterov , Marina Dovgenko. Kyiv City Oncology Center, Kyiv – Ukraine, 2 Institute of Experimental Pathology, Oncology and Radiobiology, Kyiv – Ukraine