期刊
CANCER RESEARCH
卷 69, 期 1, 页码 185-192出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-08-2513
关键词
-
类别
资金
- NIH [RO1 CA109663, PO1 CA44991, K08 CA095448]
- Frederick Kullman and Penny E. Petersen Memorial Funds
- James and Shirley Raisbeck
- Lymphoma Research Foundation
- Damon Runyon Cancer Foundation
- NATIONAL CANCER INSTITUTE [P01CA044991, R01CA109663, K08CA095448] Funding Source: NIH RePORTER
Radioimmunotherapy (BIT) for treatment of hematologic malignancies frequently fails because of disease recurrence. We therefore conducted pretargeted (P)RIT studies to augment the efficacy in mice of therapy using a pretargeted antihuman (h)CD45 antibody (Ab)-streptavidin (SA) conjugate followed by a biotinylated clearing agent and radiolabeled 1,4,7,10-tetraazacylodode cane N,N',N '',N'''-tetraacetic (DOTA)-biotin. Tumor-to-blood ratios at 24 hours were 20:1 using pretargeted anti-hCD45 RIT and <1:1 with conventional BIT. In vivo imaging studies confirmed that the PRIT approach provided high-contrast tumor images with minimal blood-pool activity, whereas directly labeled anti-hCD45 Ab produced distinct tumor images but the blood pool retained a large amount of labeled Ab for a prolonged time. Therapy experiments showed that Y-90-DOTA-biotin significantly prolonged survival of mice treated with pretargeted anti-hCD45 Ab-SA compared with mice treated with conventional RIT using Y-90-labeled anti-hCD45 Ab at 200 mu Ci. Because human CD45 antigens are confined to xenograft tumor cells in this model, and all murine tissues are devoid of hCD45 and will not bind anti-hCD45 Ab, we also compared one-step and PRIT using an anti-murine (m)CD45 Ab where the target antigen is present on normal hematopoietic tissues. After 24 h, 27.3% +/- 2.8% of the injected dose of activity was delivered per gram (% ID/g) of lymph node using I-131-A20-Ab compared with 40.0 +/- 5.4% ID/g for pretargeted In-111-DOTA-biotin. These data suggest that pretargeted methods for delivering RIT may be superior to conventional BIT when targeting CD45 for the treatment of leukemia and may allow for the intensification of therapy, while minimizing toxicities. [Cancer Res 2009;69(1):185-92]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据