MRI measurements correctly predict the relative effects of tumor oxygenating agents on hypoxic fraction in rodent BA1112 tumors. Int J Radiat Oncol Biol Phys 2000 May 01;47(2):481-8
Date
05/10/2000Pubmed ID
10802376DOI
10.1016/s0360-3016(00)00445-4Scopus ID
2-s2.0-0034194212 (requires institutional sign-in at Scopus site) 41 CitationsAbstract
PURPOSE: We evaluate whether magnetic resonance imaging (MRI) with blood oxygenation level-dependent (BOLD) contrast correctly predicts the relative effects of tumor-oxygenating agents on hypoxic fraction in BA1112 rhabdomyosarcomas in WAG/Rij rats.
METHODS AND MATERIALS: The response of ten tumors to carbogen (95% O(2)/5% CO(2)), a perfluorocarbon emulsion (PFC), and the combination of PFC + carbogen was studied with high spectral and spatial resolution MR imaging of the water resonance at 4.7 Tesla. Decreases in MR signal linewidth indicate increases in tumor blood oxygen levels.
RESULTS: Average MR signal linewidth was decreased 2.0% by carbogen, 2.5% by PFC + air, and 4.9% by PFC + carbogen. PFC + carbogen caused a larger linewidth decrease than either treatment alone (p < 0.04 by ANOVA). Maps of pixels responding to treatment indicate that combining PFC with carbogen significantly enlarges the area of the tumor in which oxygen levels are increased (p < 0.01 by ANOVA).
CONCLUSION: MRI predicts that PFC + carbogen will increase radiosensitivity more than either treatment alone; this agrees with the known effects of these treatments on hypoxic fraction. Utilizing MRI to choose the treatment that maximizes the size and extent of increases in tumor oxygenation could reduce hypoxic fraction.
Author List
Al-Hallaq HA, Zamora M, Fish BL, Farrell A, Moulder JE, Karczmar GSMESH terms used to index this publication - Major topics in bold
AnimalsBlood Pressure
Carbon Dioxide
Cell Hypoxia
Fluorocarbons
Magnetic Resonance Imaging
Neoplasm Transplantation
Oxygen
Radiation-Sensitizing Agents
Radiobiology
Rats
Rhabdomyosarcoma
Tumor Cells, Cultured
