"Carbon ion radiotherapy is a safe and effective method for treating unresectable spinal sarcomas, according to a retrospective analysis from one center in Japan. Spinal sarcomas account for no more than 13% of all orthopedic tumors, and the standard treatment has been en bloc resection. These are challenging procedures, however, and piecemeal resection can lead to a high rate of local recurrence. Radiotherapy of various types has also been considered for those patients, but doses are usually kept low, again limiting the amount of local control that is possible. Carbon ions, however, are heavier than protons and carry a greater probability of tumor control."