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Research ArticleADULT BRAIN

A Multiparametric Model for Mapping Cellularity in Glioblastoma Using Radiographically Localized Biopsies

P.D. Chang, H.R. Malone, S.G. Bowden, D.S. Chow, B.J.A. Gill, T.H. Ung, J. Samanamud, Z.K. Englander, A.M. Sonabend, S.A. Sheth, G.M. McKhann, M.B. Sisti, L.H. Schwartz, A. Lignelli, J. Grinband, J.N. Bruce and P. Canoll
American Journal of Neuroradiology May 2017, 38 (5) 890-898; DOI: https://doi.org/10.3174/ajnr.A5112
P.D. Chang
aFrom the Departments of Radiology (P.D.C., L.H.S., A.L., J.G.)
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H.R. Malone
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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S.G. Bowden
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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D.S. Chow
eDepartment of Radiology (D.S.C.), University of San Francisco School of Medicine, San Francisco, California.
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B.J.A. Gill
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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T.H. Ung
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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J. Samanamud
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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Z.K. Englander
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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A.M. Sonabend
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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S.A. Sheth
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
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G.M. McKhann II
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
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M.B. Sisti
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
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L.H. Schwartz
aFrom the Departments of Radiology (P.D.C., L.H.S., A.L., J.G.)
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A. Lignelli
aFrom the Departments of Radiology (P.D.C., L.H.S., A.L., J.G.)
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J. Grinband
aFrom the Departments of Radiology (P.D.C., L.H.S., A.L., J.G.)
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J.N. Bruce
bNeurological Surgery (H.R.M., S.G.B., B.J.A.G., T.H.U., Z.K.E., A.M.S., S.A.S., G.M.M., M.B.S., J.N.B.)
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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P. Canoll
cPathology and Cell Biology (P.C.), College of Physicians and Surgeons at Columbia University, New York, New York
dGabriele Bartoli Brain Tumor Laboratory and the Irving Cancer Research Center (H.R.M., S.G.B., B.J.A.G., T.H.U., J.S., Z.K.E., A.M.S., J.N.B., P.C.), New York, New York
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    Fig 1.

    Whole-cell counting. A, Digitized, low-power magnification view of a single H&E-stained slide. Two representative 400× fields from this single tissue specimen of relatively lower (B) and higher (C) cell density illustrate the tissue heterogeneity present at a microscopic level. Stained cellular nuclei identified by the automated counting algorithm are outlined in green. D, The “heat map” demonstrates distribution of cell density at the level of a HPF throughout the tissue sample.

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    Fig 2.

    Cell-counting statistics. A, Comparison between manual and automated cell counts for 25 high-power fields of various cellular densities. Correlation is high (r = 0.984), suggesting that the automated algorithm accurately reflects manual counts. B, For each biopsy sample, the median cell density of all HPFs is compared with that of the 98th percentile. A relatively strong linear correlation is preserved (r = 0.901), suggesting that the 98th percentile cell density simply represents a linear translation of the median cell density. C, Correlation analysis is repeated for all percentiles (0–100). With the exception of extreme values, most percentiles retain a strong linear correlation (r > 90%) with the median cell density.

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    Fig 3.

    Cell count versus MR signal intensity. Scatterplots demonstrate median cell density as a function of signal intensity on ADC (A), T2-FLAIR (B), and T1-postcontrast subtraction sequences (C) correlated by using single-variable regression analysis. The linear regression and Pearson correlation (r) were significant (P < .05) for all 3 sequences. D, The scatterplot shows the actual and predicted cell counts as estimated by combining all 3 imaging modalities in a multiple-variable regression model.

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    Fig 4.

    Correlation versus distance from the biopsy. Scatterplots demonstrate the correlation between cell density and signal intensity for each MR image (ADC, T2-FLAIR, T1-postcontrast subtraction) obtained by taking the mean of concentric spheric shells of voxels at an increasing distance from the original biopsy point. Notably, the correlations drop to 0 at a radius of approximately 5 mm (∼10 voxels), providing an estimate of the spatial accuracy of the biopsy location. T1SUB indicates T1-subtraction.

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    Fig 5.

    Whole-tumor model overlay. Estimated cellularity by applying the multiple regression model on a voxelwise basis across the tumor. The model is derived from linear regression by using ADC, T2-FLAIR, and T1-postcontrast sequences shown in the inset on the left. In the right panels, corresponding biopsy specimens (400× magnification, H&E stained sections) are shown from 2 regions obtained on the same section, highlighting the considerable variation in cellularity in and around the region of contrast enhancement (demarcated by a white outline).

Tables

  • Figures
  • Multivariate linear regression model coefficients

    βSET-ScoreP Value
    Constant1025.9817.1<.001
    ADC−10632.0−3.30<.001
    FLAIR−56.023.5−2.38<.001
    T1-subtracted12924.65.27<.001
    • Note:—SE indicates standard error.

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American Journal of Neuroradiology: 38 (5)
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P.D. Chang, H.R. Malone, S.G. Bowden, D.S. Chow, B.J.A. Gill, T.H. Ung, J. Samanamud, Z.K. Englander, A.M. Sonabend, S.A. Sheth, G.M. McKhann, M.B. Sisti, L.H. Schwartz, A. Lignelli, J. Grinband, J.N. Bruce, P. Canoll
A Multiparametric Model for Mapping Cellularity in Glioblastoma Using Radiographically Localized Biopsies
American Journal of Neuroradiology May 2017, 38 (5) 890-898; DOI: 10.3174/ajnr.A5112

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A Multiparametric Model for Mapping Cellularity in Glioblastoma Using Radiographically Localized Biopsies
P.D. Chang, H.R. Malone, S.G. Bowden, D.S. Chow, B.J.A. Gill, T.H. Ung, J. Samanamud, Z.K. Englander, A.M. Sonabend, S.A. Sheth, G.M. McKhann, M.B. Sisti, L.H. Schwartz, A. Lignelli, J. Grinband, J.N. Bruce, P. Canoll
American Journal of Neuroradiology May 2017, 38 (5) 890-898; DOI: 10.3174/ajnr.A5112
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