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1 Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical
School, 330 Brookline Ave, Boston, MA 02215.
2 Present address: Department of Radiology, Johns Hopkins Medical Center,
Baltimore, MD 21287.
3 Department of Medical Oncology, Beth Israel Deaconess Medical Center, Harvard
Medical School, Boston, MA 02215.
OBJECTIVE. The purpose of this study was to determine whether the administration of liposomal doxorubicin before radiofrequency ablation increases coagulation more than radiofrequency alone in focal hepatic tumors.
SUBJECTS AND METHODS. Fourteen focal hepatic tumors (diameter: mean ± SD, 4.0±1.8 cm) in 10 patients (colorectal cancer, n = 3 patients; hepatocellular carcinoma, n = 4; neuroendocrine tumor, n = 2; breast cancer, n = 1) were treated with internally cooled radiofrequency ablation. In addition to undergoing radiofrequency, five patients (n = 7 lesions) were randomly assigned to receive 20 mg of IV doxorubicin in a long-circulating stealth liposome carrier (Doxil) 24 hr before ablation. Contrast-enhanced helical CT was performed immediately (within 30 min) after radiofrequency ablation (baseline) and 2-4 weeks after ablation. The volume of induced coagulation was measured by three-dimensional reconstruction techniques, and the measurements were compared.
RESULTS. For tumors treated with radiofrequency alone, the volume of the thermal lesion had decreased 12-24% (mean ± SD, 82.5% ± 4.4% of initial volume) at 2-4 weeks after ablation. By comparison, increased tumor destruction at 2-4 weeks after ablation was observed for all lesions treated with combined Doxil and radiofrequency (p<0.001). Six lesions increased 24-36% in volume, and coagulation surrounding a small colorectal metastasis increased 342%. No coagulation was identified in four unablated control lesions in the two patients receiving Doxil alone.
CONCLUSION. Our pilot clinical study suggests that adjuvant Doxil chemotherapy increases tumor destruction compared with radiofrequency ablation therapy alone in a variety of focal hepatic tumors. Optimization of this synergistic strategy may ultimately allow improved clinical efficacy and outcome.
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