Abstract：
:Twenty-four patients suspected of having ovarian carcinoma received i.v. injection with a combination of radiolabeled intact IgG (1 mg) and F(ab')2 fragments (1 mg) of the chimeric monoclonal antibody MOv18, each form labeled with 1.85 MBq 131I or 125I. Laparotomy was performed either 2 or 6 days after injection, and the uptake of radioactivity was determined in a total of 329 biopsies of normal and malignant tissues. The mean elimination half life in plasma of cMOv18 IgG and F(ab')2 was 70 +/- 8 (SD) and 20 +/- 5 h, respectively. The mean uptake of IgG in tumor biopsies was 3.6-fold higher two days after injection and 6.9-fold higher than the uptake of F(ab')2 6 days after injection. Uptake in normal tissues was 3.3 and 5.5 times higher for IgG at 2 and 6 days, respectively. Two days after injection, the mean ratio of the uptake in tumor:normal tissue/patient was 3.8 +/- 1.5 and 4.0 +/- 1.8 for radiolabeled cMOv18 IgG and F(ab')2, respectively. Six days after injection, this was 6.7 +/- 4.7 for Ig G and 5.7 +/- 4.1 for F(ab')2. cMOv18 IgG has a longer circulation time in blood, a higher uptake in tumor and normal tissues, and a longer retention time compared to the F(ab')2 fragments. However, the tumor:normal tissue ratios are similar. The results do not warrant a definite conclusion as to which antibody form is most suitable for therapeutic application of antibodies but provide a more firm basis for rational design of therapeutic targeting studies using immunoconjugates.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Buist MR,Kenemans P,den Hollander W,Vermorken JB,Molthoff CJ,Burger CW,Helmerhorst TJ,Baak JP,Roos JCsubject
Has Abstractpub_date
1993-11-15 00:00:00pages
5413-8issue
22eissn
0008-5472issn
1538-7445journal_volume
53pub_type
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