Intracerebral delivery of Carboplatin in combination with either 6 MV Photons or monoenergetic synchrotron X-rays are equally efficacious for treatment of the F98 rat glioma
1 INSERM U836 Équipe 6, Grenoble Institut des Neurosciences, Grenoble, France
2 Laboratoire "Lésions des Acides Nucléiques", SCIB-UMR-E n°3 (CEA/UJF) Institut Nanosciences et Cryogénie, CEA/Grenoble, Grenoble, France
3 European Synchrotron Radiation Facility, Medical Beamline ID17, Grenoble, France
4 Department of Pathology, The Ohio State University, Columbus, Ohio, 43210, USA
5 Université Joseph Fourier; Centre Hospitalier Universitaire, Grenoble, France
Journal of Experimental & Clinical Cancer Research 2012, 31:78 doi:10.1186/1756-9966-31-78Published: 20 September 2012
The purpose of the present study was to compare side-by-side the therapeutic efficacy of a 6-day infusion of carboplatin, followed by X-irradiation with either 6 MV photons or synchrotron X-rays, tuned above the K-edge of Pt, for treatment of F98 glioma bearing rats.
Carboplatin was administered intracerebrally (i.c.) to F98 glioma bearing rats over 6 days using AlzetTM osmotic pumps starting 7 days after tumor implantation. Radiotherapy was delivered in a single 15 Gy fraction on day 14 using a conventional 6 MV linear accelerator (LINAC) or 78.8 keV synchrotron X-rays.
Untreated control animals had a median survival time (MeST) of 33 days. Animals that received either carboplatin alone or irradiation alone with either 78.8 keV or 6 MV had a MeSTs 38 and 33 days, respectively. Animals that received carboplatin in combination with X-irradiation had a MeST of > 180 days with a 55% cure rate, irrespective of whether they were irradiated with either 78.8 KeV synchrotron X-rays or 6MV photons.
These studies have conclusively demonstrated the equivalency of i.c. delivery of carboplatin in combination with X-irradiation with either 6 MV photons or synchrotron X-rays.