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Previous Volume 348:2491-2499 June 19, 2003 Number 25 Next

	Full Text PDF PDA Full Text PowerPoint Slide Set Supplementary Material Perspective by Koh, D.-M. Letters Add to Personal Archive Add to Citation Manager Notify a Friend E-mail When Cited E-mail When Letters Appear Related Article PubMed Citation

ABSTRACT

Background Accurate detection of lymph-node metastases in prostate cancer is an essential component of the approach to treatment. We investigated whether highly lymphotropic superparamagnetic nanoparticles, which gain access to lymph nodes by means of interstitial–lymphatic fluid transport, could be used in conjunction with high-resolution magnetic resonance imaging (MRI) to reveal small nodal metastases.

Methods Eighty patients with presurgical clinical stage T1, T2, or T3 prostate cancer who underwent surgical lymph-node resection or biopsy were enrolled. All patients were examined by MRI before and 24 hours after the intravenous administration of lymphotropic superparamagnetic nanoparticles (2.6 mg of iron per kilogram of body weight). The imaging results were correlated with histopathological findings.

Results Of the 334 lymph nodes that underwent resection or biopsy, 63 (18.9 percent) from 33 patients (41 percent) had histopathologically detected metastases. Of these 63 nodes, 45 (71.4 percent) did not fulfill the usual imaging criteria for malignancy. MRI with lymphotropic superparamagnetic nanoparticles correctly identified all patients with nodal metastases, and a node-by-node analysis had a significantly higher sensitivity than conventional MRI (90.5 percent vs. 35.4 percent, P<0.001) or nomograms.

Conclusions High-resolution MRI with magnetic nanoparticles allows the detection of small and otherwise undetectable lymph-node metastases in patients with prostate cancer.

Source Information

From Massachusetts General Hospital and Harvard Medical School, Boston (M.G.H., P.F.H., S.T., R.W.); and University Medical Center, Nijmegen, the Netherlands (J.B., W.M.D., C.H.K., J.R.).

Drs. Harisinghani and Barentsz contributed equally to the article.

Address reprint requests to Dr. Weissleder at the Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Bldg. 149, 13th St., Rm. 5403, Charlestown, MA 02129-2060, or at weissleder{at}helix.mgh.harvard.edu.

Full Text of this Article

Related Letters:

Use of MRI to Detect Lymph-Node Metastases in Prostate Cancer
Yaes R. J., Frauscher F., Halpern E. J., Klauser A., Harisinghani M., Barentsz J., Weissleder R.
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N Engl J Med 2003; 349:1185-1186, Sep 18, 2003. Correspondence

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