CT-guidance interstitial 125 Iodine seed brachytherapy as a salvage therapy for recurrent spinal primary tumors (Radiation Oncology)

Background: Management of spinal neoplasms has relied on open surgery and external beam radiotherapy (EBRT). Although primary spinal tumors are rare, their treatment remains a pervasive problem. This analysis sought to evaluate the safety and efficacy of CT-guided 125I seed brachytherapy for recurrent paraspinous and vertebral primary tumors. Methods: From November 2002 to June 2014, 17 patients who met the inclusion criteria were retrospectively reviewed. 14 (82.4%) had previously undergone surgery, 15 (88.2%) had received conventional EBRT and 3 (17.6%) had chosen chemotherapy. The number of 125I seeds implanted ranged from 7 to 122 (median 79) with specific activity of 0.5-0.8?mCi (median 0.7?mCi). The post-plan showed that the actuarial D90 of 125I seeds were 90?183?Gy (median 137?Gy). The follow-up period ranged from 2 to 69?months (median 19?months). The local control rate was calculated by the Kaplan-Meier method. Results: For 5 Chondrosarcomas, the 1-, 2-, 3-year local control rates were 75%, 37.5%, and 37.5%, respectively, with a median of 34?months (range, 4?39 months). For 4 chordomas, the local control rate was 50% with a median follow-up of 13?months (range, 3?17 months). For 3 fibromatosis, all of them were survival without local recurrence at the end of follow-up. During the follow-up period, 35.3% (6/17) died from metastases, 17.6% (3/17) developed local recurrence by 8, 14 and 34?months while 64.7% (11/17) remained alive. 100% experienced pain relief and normal or improved ambulation, without more than Frankel grade 3 radiation myelopathy. Conclusions: Percutaneous 125I seed implantation can be an alternative or retreatment for recurrent spinal primary tumors.