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Proceedings Paper

Nanoparticle-assisted photothermal ablation of brain tumor in an orthotopic canine model
Author(s): Jon A. Schwartz; Anil M. Shetty; Roger E. Price; R. Jason Stafford; James C. Wang; Rajesh K. Uthamanthil; Kevin Pham; Roger J. McNichols; Chris L. Coleman; J. Donald Payne
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Paper Abstract

We report on a pilot study demonstrating a proof of concept for the passive delivery of nanoshells to an orthotopic tumor where they induce a local, confined therapeutic response distinct from that of normal brain resulting in the photo-thermal ablation of canine Transmissible Venereal Tumor (cTVT) in a canine brain model. cTVT fragments grown in SCID mice were successfully inoculated in the parietal lobe of immuno-suppressed, mixed-breed hound dogs. A single dose of near-infrared absorbing, 150 nm nanoshells was infused intravenously and allowed time to passively accumulate in the intracranial tumors which served as a proxy for an orthotopic brain metastasis. The nanoshells accumulated within the intracranial cTVT suggesting that its neo-vasculature represented an interruption of the normal blood-brain barrier. Tumors were thermally ablated by percutaneous, optical fiber-delivered, near-infrared radiation using a 3.5 W average, 3-minute laser dose at 808 nm that selectively elevated the temperature of tumor tissue to 65.8±4.1ºC. Identical laser doses applied to normal white and gray matter on the contralateral side of the brain yielded sub-lethal temperatures of 48.6±1.1ºC. The laser dose was designed to minimize thermal damage to normal brain tissue in the absence of nanoshells and compensate for variability in the accumulation of nanoshells in tumor. Post-mortem histopathology of treated brain sections demonstrated the effectiveness and selectivity of the nanoshell-assisted thermal ablation.

Paper Details

Date Published: 23 February 2009
PDF: 11 pages
Proc. SPIE 7161, Photonic Therapeutics and Diagnostics V, 716130 (23 February 2009); doi: 10.1117/12.808334

Published in SPIE Proceedings Vol. 7161:
Photonic Therapeutics and Diagnostics V
Brian Jet-Fei Wong; Justus F. R. Ilgner; Nikiforos Kollias; Bernard Choi; Haishan Zeng; Reza S. Malek; Kenton W. Gregory; Guillermo J. Tearney; Laura Marcu; Henry Hirschberg; Steen J. Madsen, Editor(s)

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