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Correlation of relaxometry and histopathology: the transplantable human gliobastoma SF295 grown in athymic nude mice

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Summary

Human gliobastomas of the brain are characterized by a wide range of proton relaxation ratesin vitro (1/T1 and 1/T2) and heterogeneous appearance in magnetic resonance imaging. It was previously found that their 1/T1 values vary widely at magnetic field strengths much below imaging fields, even at the same water content. In the present study, we measure 1/T1 at different magnetic field strengths (NMRD profile) for a specific transplantable, human glioblastoma (SF295), grown subcutaneously in athymic nude mice, to search for histologic characteristics that might correlate with the variability of 1/T1 at low fields (1/T1L).

Using a field-cycling relaxometer, NMRD profiles were obtained for 32 fresh, histologically characterized, tumor specimens, 7 to 24 days post implantation of cryopreserved SF295 fragments. Tumor volume, dry weight, and pH of specimens were determined, the extent of hemorrhage and necrosis rated, and specimen location within the tumor recorded.

A statistically significant increase in the average 1/T1 was found with increasing level of necrosis at 0.0024 T and below, possibly reflecting progressive protein aggregation in samples with up to 40% necrosis. This correlation was not significant at imaging fields. Although pH was increased in central necrosis, neither pH, dry weight, sample location, nor fresh hemorrhage could explain the changes in 1/T1L. The variability of 1/T1L among SF295 samples is much reduced compared to that of fresh surgical specimens of human glioblastomas of the brain.

The heterogeneous appearance of glioblastomas in MRI may have a histologic correlate which reflects molecular changes involved with induction of cell death and necrosis. Further investigations may identify the factors responsible for affecting 1/T1L (hypoxia, radiation, chemotherapy).

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Authors and Affiliations

  1. Department of Neurosurgery, New York Medical College, 10595, Valhalla, NY

    Marga Spiller & Samuel S. Kasoff

  2. Department of Pharmacology, New York Medical College, 10595, Valhalla, NY

    Philip C. Merker

  3. Dana Faber Laboratory, American Health Foundation, 10595, Valhalla, NY

    Michael J. Iatropoulos & Gary M. Williams

  4. Department of Radiology, New York Medical College, 10595, Valhalla, NY, USA

    Shayne M. Childress

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  1. Marga Spiller
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  2. Philip C. Merker
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  4. Shayne M. Childress
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  5. Gary M. Williams
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  6. Samuel S. Kasoff
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Spiller, M., Merker, P.C., Iatropoulos, M.J. et al. Correlation of relaxometry and histopathology: the transplantable human gliobastoma SF295 grown in athymic nude mice. J Neuro-Oncol 25, 113–126 (1995). https://doi.org/10.1007/BF01057755

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