Abstract：
:Intracavitary instillation of radioantibodies has been proposed as therapy for anatomically confined malignant disease. To evaluate this therapeutic strategy, a monoclonal antibody reactive with human transferrin receptor (7D3) was evaluated for localization in a human malignant mesothelioma transplanted i.p. in athymic nude mice. This antibody was purified and labeled with 131I, 125I, or 111In. Radiolabeled antibody was administered i.p. or i.v. to tumor-bearing mice. Three h after injection, the percentage of injected dose/g (ID/g) of tumor was higher in free-floating ascites tumor cells (31.0%/g tumor cell pellet) after i.p. injection than after i.v. injection (12.0%). However, localization of radiolabel in i.p. solid tumors was similar (5.37% ID/g i.p. versus 4.73% of ID/g i.v.), and by 24 h both routes of administration produced similar localization of radiolabel in both free-floating ascites cells and solid tumors. In contrast, uptake of radiolabel into liver, kidney, and to a lesser extent bone and bone marrow, was less with i.p. than with i.v. administration. In clinical studies with 111In and 90Y antibodies administered i.p. to patients with ovarian cancer, confined biodistribution of the radioantibody was again seen, although interpatient variability of rate of egress of the radiolabel was documented. Therefore, both preclinical and clinical data indicate that i.p. therapy with immunoconjugates may be advantageous for cancer confined to the peritoneal cavity. This advantage stems primarily from reduced localization of isotope in organs of catabolism or toxicity (liver, kidney, bone, and bone marrow), rather than greatly increased levels of isotope in tumor. Unresolved problems include degree of antibody penetration into solid tumors, microdosimetry, and radioantibody effectiveness for tumor killing.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Griffin TW,Collins J,Bokhari F,Stochl M,Brill AB,Ito T,Emond G,Sands Hsubject
Has Abstractpub_date
1990-02-01 00:00:00pages
1031s-1038sissue
3 Suppleissn
0008-5472issn
1538-7445journal_volume
50pub_type
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