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Chen LL , Mu ZM , Hachem P , Ma CM , Wallentine A , Pollack A
MR-guided focused ultrasound: enhancement of intratumoral uptake of H-3 -docetaxel in vivo
Physics in Medicine and Biology. 2010 Dec;55(24) :7399-7410
PMID: ISI:000284825200001   
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Abstract
The purpose of this study is to quantify the enhancement of [H-3]-docetaxel in implanted prostate tumors treated with MR-guided pulsed focused ultrasound (MRgFUS). Human prostate cancer, LNCaP cells in 25 mu l, were implanted into the prostates of male nude mice. The tumor growth was directly monitored on MRI. When the tumor reached a designated size, MRgFUS treatment was performed using a focused ultrasound treatment system (InSightec ExAblate 2000) with a 1.5 T GEMR scanner. The tumor-bearing animals were randomly divided into three groups: group 1, MRgFUS treatment + [H-3]-docetaxel; group 2, [H-3]-docetaxel only and group 3, as a control. Animals in group 1 were treated with MRgFUS non-invasively. Immediately after the treatment, the animals received a single dose of tail vein injection of docetaxel at 15 mg kg(-1) mixed with [H-3]-docetaxel at 50 uCi kg(-1) in a total volume of 150 mu l. Animals in group 2 were treated the same as in group one, however without MRgFUS treatment. Animals in group 3 were treated as a control. Animals were sacrificed 30 min after i.v. injections regardless of whether or not they received focused ultrasound. Tumors were removed and processed. The radioactivity of [H-3]-docetaxel in the tumor tissue was quantitatively measured by a liquid scintillation counter. Our study showed that all animals tolerated the MRgFUS treatment well. Our data showed increased H-3-docetaxel concentration in the tumor in the MRgFUS-treated group (1079 +/- 132 cmp/75 mg) versus those without MRgFUS treatment (524 +/- 201 cmp/75 mg) with P = 0.037.
Notes
Chen, Lili Mu, Zhaomei Hachem, Paul Ma, C-M Wallentine, Annie Pollack, Alan Focused Ultrasound Surgery Foundation ; [DOD PC073127] We would like to thank Mrs Teresa Richardson for help with machine QA before experiments. We would also like to acknowledge the support from InSightec, especially Dr Arik Hananel, Ms Osnat Dogadkin, Mr Amit Sokolov, Javier Grinfeld MSc and Dr Jessica Foley for their excellent technical support and assistance. This study was supported by the Focused Ultrasound Surgery Foundation and in part by grant DOD PC073127. 36 Iop publishing ltd; dirac house, temple back, bristol bs1 6be, england 688bt