Imaged-guided Therapy of Ewing Sarcoma Using Magnetic Nanoparticles Coupled with anti-CD99-Antibody and siRNA against EWS/FLI1

Ewing Sarcoma (ES) is the second most common bone tumor in children and adolescents. It is characterized by a specific translocation between the EWS gene and members of the ETS-family of transcription factors. The reciprocal translocation between EWS and FLI1 [t(11;22)(q24;q12)] is identified in about 86% of ES. Furthermore tumor cells strongly express the CD99 surface antigen and the Ewing Tumor-Associated Antigen (ETAA). The objective of the project is to deliver siRNA against EWS/FLI1 using magnetic nanoparticles for monitoring of delivery via MRI. Coupling of respective particles with an anti-CD99 and/or an…