Purpose: Investigation of safety, tolerability, pharmacokinetics, and anti-tumor activity of the Lewis Y-specific, fully humanized monoclonal antibody (mAb) IGN311 in patients with Lewis Y positive tumors in a Phase I...Purpose: Investigation of safety, tolerability, pharmacokinetics, and anti-tumor activity of the Lewis Y-specific, fully humanized monoclonal antibody (mAb) IGN311 in patients with Lewis Y positive tumors in a Phase I clinical trial. Experimental Design: Twelve patients (pts) were enrolled in an open-label, uncontrolled, dose escalating Phase I study. Three pts received 50 mg, three pts 100 mg and six pts 200 mg IGN311 by i.v. infusion on days 1 and 15. Blood samples were taken immediately before infusion, and 0.5, 4, 8, 24 hours post infusion, as well as on days 3, 5 and 8 after the first and second infusion, respectively, and day 29. A final visit was scheduled for day 43. Results: No drug related adverse events were observed in the 50 mg and 100 mg dose groups. Three out of six patients in the 200 mg dose group showed drug related adverse reactions with nausea, vomiting and hypotension in one patient (NCI CTC grade 3) being the dose limiting toxicities. t1/2 of IGN311 was ~20 days after second infusion of IGN311. Sera of patients receiving IGN311 were capable of lysing Lewis Y positive tumor cells in vitro by both, complement-dependent cytotoxicity (CDC) and antibody-dependent cellular cytotoxicity (ADCC). Circulating tumor cells found in the peripheral blood in two out of twelve pts prior to treatment were reduced after treatment to below the quantification limit of the detection method. None of the patients showed an increase in the number of disseminated tumor cells during treatment period. Conclusions: The good safety and PK profile, the biological activity regarding CDC and ADCC mediated tumor cell lysis, and the elimination of circulating tumor cells warrant further clinical investigation of IGN311.展开更多
目的:探讨α1,2-岩藻糖转移酶(α1,2-fucosyltransferase,FUT1)基因转染对人卵巢癌细胞中HER2/neu表达及活性的影响。方法:分别应用Real time PCR、免疫细胞化学染色和Western blot方法检测转染前后卵巢癌细胞中HER2/neu在基因、蛋白水...目的:探讨α1,2-岩藻糖转移酶(α1,2-fucosyltransferase,FUT1)基因转染对人卵巢癌细胞中HER2/neu表达及活性的影响。方法:分别应用Real time PCR、免疫细胞化学染色和Western blot方法检测转染前后卵巢癌细胞中HER2/neu在基因、蛋白水平上的表达和磷酸化情况,利用免疫共沉淀方法检测HER2/neu蛋白上是否有Lewis(y)结构。结果:Real time PCR结果显示转染后细胞中HER2/neu mRNA表达明显增高。免疫细胞化学染色、免疫共沉淀结合Western blot检测到转染后卵巢癌细胞中HER2/neu蛋白和Lewis(y)抗原的表达均较转染前显著增加,HER2/neu蛋白上有Lewis(y)抗原结构。Western blot结果显示基因转染后HER2/neu的酪氨酸磷酸化水平显著升高。结论:Lewis(y)抗原是HER2/neu结构上的一部分,其表达增加不但促进卵巢癌细胞中HER2/neu的表达,还激活了HER2/neu受体酪氨酸激酶。展开更多
文摘Purpose: Investigation of safety, tolerability, pharmacokinetics, and anti-tumor activity of the Lewis Y-specific, fully humanized monoclonal antibody (mAb) IGN311 in patients with Lewis Y positive tumors in a Phase I clinical trial. Experimental Design: Twelve patients (pts) were enrolled in an open-label, uncontrolled, dose escalating Phase I study. Three pts received 50 mg, three pts 100 mg and six pts 200 mg IGN311 by i.v. infusion on days 1 and 15. Blood samples were taken immediately before infusion, and 0.5, 4, 8, 24 hours post infusion, as well as on days 3, 5 and 8 after the first and second infusion, respectively, and day 29. A final visit was scheduled for day 43. Results: No drug related adverse events were observed in the 50 mg and 100 mg dose groups. Three out of six patients in the 200 mg dose group showed drug related adverse reactions with nausea, vomiting and hypotension in one patient (NCI CTC grade 3) being the dose limiting toxicities. t1/2 of IGN311 was ~20 days after second infusion of IGN311. Sera of patients receiving IGN311 were capable of lysing Lewis Y positive tumor cells in vitro by both, complement-dependent cytotoxicity (CDC) and antibody-dependent cellular cytotoxicity (ADCC). Circulating tumor cells found in the peripheral blood in two out of twelve pts prior to treatment were reduced after treatment to below the quantification limit of the detection method. None of the patients showed an increase in the number of disseminated tumor cells during treatment period. Conclusions: The good safety and PK profile, the biological activity regarding CDC and ADCC mediated tumor cell lysis, and the elimination of circulating tumor cells warrant further clinical investigation of IGN311.
文摘目的:探讨α1,2-岩藻糖转移酶(α1,2-fucosyltransferase,FUT1)基因转染对人卵巢癌细胞中HER2/neu表达及活性的影响。方法:分别应用Real time PCR、免疫细胞化学染色和Western blot方法检测转染前后卵巢癌细胞中HER2/neu在基因、蛋白水平上的表达和磷酸化情况,利用免疫共沉淀方法检测HER2/neu蛋白上是否有Lewis(y)结构。结果:Real time PCR结果显示转染后细胞中HER2/neu mRNA表达明显增高。免疫细胞化学染色、免疫共沉淀结合Western blot检测到转染后卵巢癌细胞中HER2/neu蛋白和Lewis(y)抗原的表达均较转染前显著增加,HER2/neu蛋白上有Lewis(y)抗原结构。Western blot结果显示基因转染后HER2/neu的酪氨酸磷酸化水平显著升高。结论:Lewis(y)抗原是HER2/neu结构上的一部分,其表达增加不但促进卵巢癌细胞中HER2/neu的表达,还激活了HER2/neu受体酪氨酸激酶。
