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BJU Int. 2009 Apr;103(7):883-8. doi: 10.1111/j.1464-410X.2008.08130.x. Epub 2008 Oct 24.

Correlation of diffusion-weighted magnetic resonance data with cellularity in prostate cancer.

Author information

1
University of Hull, Centrre for MR Investigations, UK. bzelhof@hotmail.com

Abstract

OBJECTIVE:

To assess the relationship between the apparent diffusion coefficient (ADC) on magnetic resonance imaging (MRI) and cell density (CD) obtained from radical prostatectomy (RP) specimens.

PATIENTS AND METHODS:

In all, 36 patients with prostate cancer were recruited; T2-weighted and diffusion-weighted MRI was obtained axially using a 3.0 T scanner. Patients then proceeded to RP; the prostate was whole-mounted and sectioned axially. Slices (3 microm) were cut from the surface of each section and stained with haematoxylin and eosin (H&E). Five randomly positioned areas from the tumour and normal peripheral zone (PZ) were examined by light microscopy at x 200, then digitally photographed and analysed to obtain automatic CD. ADC values were determined from the MRI data using the H&E slides as a reference. ADC and CD values were measured in both malignant lesions and the PZ, and the correlation between ADC and CD assessed.

RESULTS:

ADC values were lower (P <or= 0.001) in regions pathologically determined as tumour, with a mean (sd) of 1.45 (0.26) x 10(-3) mm(2)/s, vs normal PZ, of 1.90 (0.33) x 10(-3) mm(2)/s. Similarly, the mean CD over the five fields was higher (P <or= 0.001) in tumour than in normal PZ, with values of 18.89 (4.93)% vs 9.22 (3.23)%. There was a significant correlation between the ADC values and CD (r = -0.50, P < 0.001) regardless of tissue type. CD values were high in cancer which had lower ADC values than normal PZ.

CONCLUSIONS:

ADC values were correlated successfully with CD; this information cannot be obtained with conventional MRI and is useful in characterizing prostate cancer.

[Indexed for MEDLINE]
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