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Cellularity and apparent diffusion coefficient in oligodendroglial tumours characterized by genotype

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Abstract

Purpose Apparent diffusion coefficient (ADC) describes water diffusion within tissues. Previous studies report a negative linear correlation between minimum ADC and tumour cellularity in different types of gliomas, but there are no studies in oligodendroglial tumours. This study evaluated the relationship between ADC and tumour cellularity in oligodendroglial tumours characterized by genotype. Methods ADC was assessed in 17 patients with known 1p/19q status: 3 grade II oligodendrogliomas (OII), 9 grade II oligoastrocytomas (OAII), 5 grade III oligoastrocytomas (OAIII). Regions of interest were placed on ADC maps around tumour margins to generate mean tumour ADC, and over minimum and maximum tumour ADC. Histopathology assessment of tumour cellularity determined minimum, maximum and mean cell density in serial stereotactic biopsies. Results 1p/19q loss was present in 2/3 OII, 5/9 OAII, 2/5 OAIII. Grade III tumours had higher maximum cell density than grade II tumours (17.2 vs. 10.57%: Mann Whitney U; P = 0.20). Oligoastrocytoma were more likely to have a lower minimum cell density than oligodendrogliomas (Mann Whitney U; P = 0.032). There was no relationship between cell density and genotype. There was no linear correlation between mean ADC and mean cell density (Spearmans rho; r = 0.486: P = 0.438), minimum ADC and maximum cell density (Spearmans rho; r = 0.158: P = 0.660), and maximum ADC and minimum cell density (Spearmans rho; r = 0.039: P = 0.985). Conclusions In oligodendroglial tumours there is no relationship between quantitative assessment of cellularity and ADC. This may reflect differences in oligodendroglial tumour biology compared to other gliomas, although the composition of the extracellular matrix may influence ADC more than cellularity.

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Acknowledgments

Supported by grants from The Walton Centre Neuroscience Fund, Clatterbridge Cancer Research Trust and The Royal Colleges of Edinburgh and Ireland.

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We declare that we have no conflict of interest.

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Correspondence to Michael D. Jenkinson.

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Jenkinson, M.D., du Plessis, D.G., Smith, T.S. et al. Cellularity and apparent diffusion coefficient in oligodendroglial tumours characterized by genotype. J Neurooncol 96, 385–392 (2010). https://doi.org/10.1007/s11060-009-9970-9

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  • DOI: https://doi.org/10.1007/s11060-009-9970-9

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