Dynamic contrast-enhanced derived cerebral blood volume correlates better with leak correction than with no correction for vascular endothelial growth factor, microvascular density, and grading of astrocytoma.
OBJECTIVE
To look for the impact of leak correction on correlation of perfusion indices with microvessel density (MVD) and vascular endothelial growth factor (VEGF) in astrocytomas.


METHODS
Dynamic contrast-enhanced magnetic resonance imaging was performed in 64 patients with varying grades of astrocytoma. Perfusion indices (ie, relative cerebral blood volume (rCBV) with and without leak correction, relative cerebral blood flow (rCBF), permeability (k(trans)), and leakage (v(e)) were quantified. MVD and VEGF-expressing cells were quantified from the excised tumor tissues and were correlated with perfusion metrics.


RESULTS
Perfusion indices showed significant difference among the astrocytoma grades. The corrected rCBV correlated better with MVD and VEGF. The corrected rCBV correlated (r = 0.853, P = <0.001) strongly, whereas the uncorrected rCBV (r = 0.592, P = <0.001) and k(trans) (r = 0.498, P = 0.001) correlated moderately with tumor grade. The corrected rCBV discriminated 100% low-grade from high-grade astrocytoma, while uncorrected rCBV did this in 95.5% low-grade and 71.4% high-grade astrocytoma.


CONCLUSIONS
Corrected rCBV better correlates with grade and is more accurate in discriminating low-grade from high-grade astrocytoma compared with uncorrected rCBV.
Haris
Mohammad
M
Department of Radiodiagnosis, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Husain
Nuzhat
N
Singh
Anup
A
Husain
Mazhar
M
Srivastava
Savita
S
Srivastava
Chhitiz
C
Behari
Sanjay
S
Rathore
Ram Kishore S
RK
Saksena
Sona
S
Gupta
Rakesh Kumar
RK
D000328:Adult; D016477:Artifacts; D001254:Astrocytoma / Q000473:pathology*; D001932:Brain Neoplasms / Q000098:blood supply / Q000175:diagnosis* / Q000378:metabolism*; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008833:Microcirculation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D042461:Vascular Endothelial Growth Factor A / Q000032:analysis*
D003287:Contrast Media; D042461:Vascular Endothelial Growth Factor A; D019786:Gadolinium DTPA