Which of the following malignant tumors is radioresistant?: (A) Ewing's sarcoma, (B) Retinoblastoma, (C) Osteosarcoma, (D) Neuroblastoma
Answer is C. Osteosarcoma is a radioresistant tumor; therefore treatment focuses on chemotherapy and surgery. Ref: Encyclopedia of Cancer, Volume 1, By Manfred Schwab, 2008, Page 2201; Aicle: Pahenolide and Ionizing Radiation Synergistically Induce Cell Death in LM7 Osteosarcoma Cells, 2012.