Abstract
Epidural neuroblastoma xenografts in nude rats causing paraparesis were treated with intravenous injection of an anti-GD2 monoclonal antibody 3F8. Metastatic or primary epidural tumors in humans cause rapid neurologic compromise. Treatment is often unsatisfactory. An animal model was established to study antibody targeted therapy of epidural tumor. Human neuroblastoma was xenotransplanted into the thoracic epidural space of nude rats. When paraparesis developed, animals were treated intravenously with an anti-GD2 monoclonal antibody, 3F8, either alone or radiolabeled with131Iodine. Improvement in neurologic function occurred in 2 of 20 (10%) animals receiving no treatment or control antibody, 14 of 17 (82%) animals receiving 3F8 alone and all 9 animals receiving131I-3F8 (p<0.0001 for 3F8 or131I-3F8 vs. control). Six animals treated with 3F8 alone recovered normal neurologic function and remained well until sacrifice 10 days later. Four animals treated with 3F8 alone had no tumor evident on pathologic examination. The percent injected dose of131I-3F8/g tumor in 5 samples ranged from 0.73% to 3.8%. These observations demonstrate that neoplastic epidural compression of the spinal cord in the rat can be treated successfully with intravenous unmodified monoclonal antibody and that signs of neurologic dysfunction can be reversed. The potential of this approach in treating patients with epidural tumors and other neoplasms, especially those that are not sensitive to chemotherapy or radiotherapy, deserves to be explored.
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Bergman, I., Arbit, E., Rosenblum, M. et al. Treatment of spinal epidural neuroblastoma xenografts in rats using anti-GD2 monoclonal antibody 3F8. J Neuro-Oncol 15, 235–242 (1993). https://doi.org/10.1007/BF01050069
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DOI: https://doi.org/10.1007/BF01050069