Meeting Banner
Abstract #1724

Optimization of Combined Anti-VEGF Plus Radiation Therapy in Brain Tumor Xenograft Models

Kimberly Pechman1, 2, Andrew Lozen1, Kathleen M. Schmainda, 23

1Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, United States; 2Translational Brain Tumor Program, Medical College of Wisconsin, Milwaukee, WI, United States; 3Radiology and Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States

Few systematic studies have examined optimal timing for combining anti-angiogenic therapy with radiation for brain tumor treatment. MRI measures of enhancing tumor volume have proven unreliable since decreases in enhancement may be independent of biologic effect. The purpose of this study was to use rCBV, derived from DSC-MRI, and enhancing volume to optimize combination of anti-VEGF agent, B20, and radiation for treatment of U87 brain tumor models. The studies demonstrate optimal combination occurs when radiation before B20 providing the largest survival benefit.

Keywords

additional addressed administered advancing agent aggressive alone analyzed animal anti approved becoming beginning benefit biophysics blood brain cell cells choice circulation clear cohorts coil college combination combinations combined common concurrently confound consequently contrast control controls corrected create cultured currently daily days decrease degree delivery density dependence depends derived determine determined dose drug drugs efficacy enhanced enhancing entail evaluate evaluating existed fitted fully function furthermore general goal grade growth harvested healthier human hypoxia improve included increasingly induced influence inhibited injected inoculation insight interestingly larger leakage linear little loading maps markers matrix measures measuring median medical minimize model models neurosurgery optimal optimization optimize paradigm paradigms permeability plus post primary processed program proliferation proven providing questions radiation radiology rare rats receive recurrent reported response scanner seven significance since slices south starting studies surface survival systematic tailed temporal therapeutic therapies therapy timing tissue translational transmit treated treatment treatments tumor underway unreliable untreated vascular volume volumes