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Effect of thalidomide on colorectal cancer liver metastases in CBA mice. | LitMetric
Background And Aims : Thalidomide has undergone resurgence in the treatment of specific malignancies. One of the possible actions of thalidomide may be an antiangiogenic effect. This study investigates the effects of thalidomide on tumor growth and long-term survival in a murine model of colorectal liver metastases.Methods : Liver metastases were produced in male CBA mice by intrasplenic injection of a dimethyl hydrazine induced MoCR colon cancer murine cell line. Thalidomide was administered daily at doses ranging from 50 to 300 mg/kg by intraperitoneal injection. Tumor growth was assessed using quantitative stereological analysis. The effect on long-term survival was determined at the maximum tolerated dose using Kaplan-Meier analysis. The microvascular effects of thalidomide were assessed by laser Doppler flowmetry (LDF) and microvascular resin casting. Immunohistochemistry was used to determine vascular endothelial growth factor (VGEF) and basic fibroblast growth factor (bFGF) expression.Results : Thalidomide, (50-300 mg/kg) caused no significant reduction in tumor growth by day 21 following induction of liver metastases and caused systemic toxicity at a dose of 300 mg/kg. At a dose of 200 mg/kg given beyond 35 days, thalidomide significantly reduced tumor growth compared to control, (P = 0.029). No significant impact on survival was however observed (P = 0.93). LDF and microvascular resin casting showed no differences in blood flow or tumor microvascular architecture. VGEF and FGF were expressed in tumors, but remained unaltered by thalidomide administration compared to matched controls.Conclusions : Thalidomide caused a significant reduction in the volume of colorectal liver metastases during the late phase of tumor growth. There was however no improvement in survival. Tumor growth reduction in this model did not appear to be due to microvascular changes or altered expression of VGEF or basic FGF. Further investigation into potential mechanisms of action of thalidomide and its synergistic use with other therapies is required.
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