Andrew C Gordon1, Robert J Lewandowski2, Riad Salem3, Delbert E Day4, Reed A Omary5, Andrew C Larson6. 1. Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago; Department of Biomedical Engineering, Northwestern University, Evanston, Illinois. Electronic address: a-larson@northwestern.edu. 2. Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago. 3. Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago; Division of Hematology/Oncology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago; Division of Organ Transplantation, Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago. 4. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri. 5. Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, Tennessee. 6. Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago; Department of Biomedical Engineering, Northwestern University, Evanston, Illinois.
Abstract
PURPOSE: To test whether iron oxide (IO)-containing yttrium aluminosilicate (YAS) microparticles (MPs) can generate localized therapeutic hyperthermia (≥ 43°C) when injected intratumorally in an animal model of liver cancer and whether MP distributions could be visualized with magnetic resonance (MR) imaging. MATERIALS AND METHODS: Twenty-one Sprague-Dawley rats implanted with N1-S1 liver tumors were assigned to alternating magnetic field (AMF) exposure following intratumoral injection with IO-YAS MPs (n = 7), sham surgery (n = 7), or baseline iron quantification (n = 7). Three fiberoptic probes allowed spatial and temporal monitoring of temperatures during 24 minutes of AMF exposure. T2-weighted turbo spin-echo MR imaging was performed within 1 hour after the procedure to detect signal voids caused by IO-YAS deposition. Hematoxylin and eosin-stained pathologic slides were also obtained, and the presence of IO-YAS was evaluated with inductively coupled plasma optical emission spectroscopy. RESULTS: Following AMF exposure, intratumoral temperatures after IO-YAS MP injection achieved therapeutic hyperthermia whereas those after sham surgery did not (46.6°C ± 1.3 vs 36.8°C ± 0.4; P < .0001). Within the treated group, the normal hepatic parenchyma (NHP) and rectal temperatures were 37.4°C ± 0.9 and 36.5°C ± 1.0 (P = .0809) at the conclusion of AMF exposure, respectively. A T2-weighted signal void at the tumor site was observed in all seven treated animals, and intratumoral IO-YAS was visualized on subsequent histopathologic examination in each case. The mean ratio of tumor:NHP Fe concentrations attributable to IO-YAS MPs was 108:1. CONCLUSIONS: AMF exposure of intratumoral IO-YAS MPs generates localized therapeutic hyperthermia in an animal model of liver cancer. MR detectability and potential for combination brachytherapy warrants further investigation for thermoradiotherapy in liver cancer.
PURPOSE: To test whether iron oxide (IO)-containing yttrium aluminosilicate (YAS) microparticles (MPs) can generate localized therapeutic hyperthermia (≥ 43°C) when injected intratumorally in an animal model of liver cancer and whether MP distributions could be visualized with magnetic resonance (MR) imaging. MATERIALS AND METHODS: Twenty-one Sprague-Dawley rats implanted with N1-S1 liver tumors were assigned to alternating magnetic field (AMF) exposure following intratumoral injection with IO-YAS MPs (n = 7), sham surgery (n = 7), or baseline iron quantification (n = 7). Three fiberoptic probes allowed spatial and temporal monitoring of temperatures during 24 minutes of AMF exposure. T2-weighted turbo spin-echo MR imaging was performed within 1 hour after the procedure to detect signal voids caused by IO-YAS deposition. Hematoxylin and eosin-stained pathologic slides were also obtained, and the presence of IO-YAS was evaluated with inductively coupled plasma optical emission spectroscopy. RESULTS: Following AMF exposure, intratumoral temperatures after IO-YAS MP injection achieved therapeutic hyperthermia whereas those after sham surgery did not (46.6°C ± 1.3 vs 36.8°C ± 0.4; P < .0001). Within the treated group, the normal hepatic parenchyma (NHP) and rectal temperatures were 37.4°C ± 0.9 and 36.5°C ± 1.0 (P = .0809) at the conclusion of AMF exposure, respectively. A T2-weighted signal void at the tumor site was observed in all seven treated animals, and intratumoral IO-YAS was visualized on subsequent histopathologic examination in each case. The mean ratio of tumor:NHP Fe concentrations attributable to IO-YAS MPs was 108:1. CONCLUSIONS:AMF exposure of intratumoral IO-YAS MPs generates localized therapeutic hyperthermia in an animal model of liver cancer. MR detectability and potential for combination brachytherapy warrants further investigation for thermoradiotherapy in liver cancer.
Authors: P R Stauffer; T C Cetas; A M Fletcher; D W DeYoung; M W Dewhirst; J R Oleson; R B Roemer Journal: IEEE Trans Biomed Eng Date: 1984-01 Impact factor: 4.538
Authors: P K Sneed; P R Stauffer; M W McDermott; C J Diederich; K R Lamborn; M D Prados; S Chang; K A Weaver; L Spry; M K Malec; S A Lamb; B Voss; R L Davis; W M Wara; D A Larson; T L Phillips; P H Gutin Journal: Int J Radiat Oncol Biol Phys Date: 1998-01-15 Impact factor: 7.038
Authors: Khairuddin Memon; Laura Kulik; Robert J Lewandowski; Mary F Mulcahy; Al B Benson; Daniel Ganger; Ahsun Riaz; Ramona Gupta; Michael Vouche; Vanessa L Gates; Frank H Miller; Reed A Omary; Riad Salem Journal: J Hepatol Date: 2012-09-18 Impact factor: 25.083