Abstract：
:Twenty patients with metastatic malignant melanoma were studied with 99mTc-labeled monoclonal antibody (MoAb) Fab fragment (NR-Ml-05) reactive with a high molecular weight (Mr 240,000) melanoma associated antigen. Patients received 40 mg unlabeled irrelevant MoAb (NR-2AD-IgG) and 7.5 mg unlabeled NR-Ml-05 (whole IgG) prior to infusion of 10 mg 99mTc-labeled (10-25 mCi) NR-Ml-05 Fab. Unlabeled MoAb were given to block nonspecific and specific binding sites. Gamma camera scans and single photon emission computed tomography were performed at 8 and 24 h postadministration. Of 172 preexisting lesions, 136 were imaged for a sensitivity of detection of 79%. Imaging was site and size dependent with the greatest sensitivity for liver lesions (100%) and the least for bowel (0%). Six sites (2 skin, 1 lung, 3 liver) were detected by single photon emission computed tomography that were missed on routine planar images. Forty-one additional unconfirmed sites were seen. Of these, 7 (17%) have been confirmed as tumor after a median follow-up time of 6 months. False positive scans included scar tissue, areas of chronic inflammation, an infected femoral aneurysm, and septic emboli. Nonspecific uptake of radioactivity occurred in kidney, gallbladder, bowel, thyroid, and myocardium. Human anti-mouse antibodies were detected in up to 69% of patients. In summary, radioimaging with 99mTc-NR-Ml-05 is a sensitive test, especially for detecting liver lesions. It is safe, simple to administer, and convenient for the patient. Biodistribution and imaging sensitivity differ significantly from studies in which 111In-labeled anti-melanoma MoAb have been used.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Lamki LM,Zukiwski AA,Shanken LJ,Legha SS,Benjamin RS,Plager CE,Salk DF,Schroff RW,Murray JLsubject
Has Abstractpub_date
1990-02-01 00:00:00pages
904s-908sissue
3 Suppleissn
0008-5472issn
1538-7445journal_volume
50pub_type
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