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Basic Sciences

Localization of Gd2-specific Monoclonal Antibody 3F8 in Human Osteosarcoma

John P. Heiner, Floro Miraldi, Steven Kallick, John Makley, John Neely, William H. Smith-Mensah and Nai-Kong V. Cheung
John P. Heiner
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Floro Miraldi
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Steven Kallick
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John Makley
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John Neely
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William H. Smith-Mensah
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Nai-Kong V. Cheung
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DOI:  Published October 1987
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Abstract

3F8 is a murine IgG3 monoclonai antibody specific for the antigen disialoganglioside Gd2. Immunofluorescence staining showed strong binding of 3F8 to 15 of 17 human osteosarcomas, including primary and metastatic tumors. The targeting potentials of the native monoclonal antibody (3F8) and the F(ab′)2 fragment (p-3F8) were tested in BALB/c athymic nude mice xenografted with human osteosarcomas. After radiolabeling with iodine using the chloramine T method, both 3F8 and p-3F8 retained immunoreactivities. The irrelevant IgG3 antibody TIB114 and its F(ab′)2 fragment were used as negative controls. A Ewing's sarcoma xenograft, which was low in Gd2 antigen, was also studied for comparison. Mice were sacrified 1 day and 4 days after i.v. antibody injection. 3F8 and p-3F8 showed preferential accumulation in osteosarcoma over normal tissues with tumor:nontumor ratios of 2.7–58:1 and 1.4–82:1, respectively, on Day 1. These ratios improved to 10–163:1 and 6.0–75:1 on Day 4. The intact antibody 3F8 showed selective tumor uptake with a much higher percentage of injected dose per g than the fragment p-3F8 and exhibited a longer tissue half-life than p-3F8. These data indicate that anti-Gd2 monoclonal antibodies may be useful for imaging and targeted therapy of human osteogenic sarcoma. The F(ab′)2 fragment has the advantage of achieving favorable tumor:nontumor ratios sooner after antibody injection while the intact antibody shows better retention by tumor tissues.

Footnotes

  • ↵1 Supported by Grant ACS-CDA-4-85 from the American Cancer Society and in part by USPHS Grant CA-39320 from the National Cancer Institute and grants from the Ireland Cancer Center, Cleveland, OH.

  • ↵4 To whom requests for reprints should be addressed, at Memorial Sloan Kettering Cancer Center, 1275 York Ave. New York, NY 10021.

  • Received March 30, 1987.
  • Revision received June 24, 1987.
  • Accepted July 22, 1987.
  • ©1987 American Association for Cancer Research.
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October 1987
Volume 47, Issue 20
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Localization of Gd2-specific Monoclonal Antibody 3F8 in Human Osteosarcoma
John P. Heiner, Floro Miraldi, Steven Kallick, John Makley, John Neely, William H. Smith-Mensah and Nai-Kong V. Cheung
Cancer Res October 15 1987 (47) (20) 5377-5381;

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Localization of Gd2-specific Monoclonal Antibody 3F8 in Human Osteosarcoma
John P. Heiner, Floro Miraldi, Steven Kallick, John Makley, John Neely, William H. Smith-Mensah and Nai-Kong V. Cheung
Cancer Res October 15 1987 (47) (20) 5377-5381;
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