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Abstract #0770

Reproducibility study of disrupted white matter integrity and partial recovery in children treated for medulloblastoma

Wilburn E Reddick1, Jared J Sullivan1, John O Glass1, Yian Guo2, Julie H Harreld1, Yimei Li2, Giles W Robinson3, Amar Gajjar3, and Thomas E Merchant4
1Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN, United States, 2Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN, United States, 3Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, United States, 4Department of Radiation Oncology, St. Jude Children's Research Hospital, Memphis, TN, United States

The current reproducibility study evaluates 140 children treated for medulloblastoma and 92 age-similar controls using TBSS analysis of FA and dosimetry accounting for age. Treatment included surgery, post-operative standard or high dose craniospinal irradiation and adjuvant chemotherapy. FA measures at baseline after surgery but prior to therapy demonstrated an immediate decrease due to tumor and surgery, which was then accentuated by irradiation. A partial recovery of FA followed, which was attenuated in patients receiving higher doses. These longitudinal profiles need to be considered when conducting cross-sectional studies of patients at time points during or after therapy.

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