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Garden State Cancer Center, Center for Molecular Medicine and Immunology, Newark, New Jersey
St. Joseph's Hospital and Medical Center, Paterson, New Jersey
Correspondence: For correspondence or reprints contact: David M. Goldenberg, MD, Garden State Cancer Center, Center for Molecular Medicine and Immunology, 1 Bruce St., Newark, NJ 07103.
ABSTRACT
This study evaluates the pharmacokinetics, dosimetry, toxicity and therapeutic potential of radiolabeled NP-4 and MN-14 anti-CEA antibodies in medullary thyroid cancer (MTC). Methods: Eighteen patients with advanced MTC entered exploratory clinical studies with therapeutic doses of 131I-labeled NP-4 and MN-14 murine monoclonal antibodies (MAbs) reactive with carcinoembryonic antigen (CEA). Doses administered ranged from 46 mCi for 131I-MN-14 IgG to 195 mCi for 131I-MN-14 F(ab)2 in patients negative for human anti-mouse antibodies (HAMA). Results: The radioconjugate blood half-life (T1/2) for the whole IgG was 42.5 ± 5.0 hr compared to 18.8 ± 4.1 hr for the bivalent fragments. Tumor doses of 17.5 ± 11.0 and 11.4 ± 6.3 cGy/mCi were estimated for 131I-MN-14 IgG and F(ab)2, respectively. Tumor/red marrow dose ratios exceeded 3:1 for most lesions. Red marrow doses of up to 350 cGy generally could be delivered with < grade 4 toxicity. Seven of 14 evaluable patients showed evidence of anti-tumor effects lasting up to 26 months, based on physical exam, tumor markers or computed tomography. Conclusion: This study demonstrates that anti-CEA MAbs may be suitable for radioimmunotherapy of metastatic or recurrent MTC.
Key Words: radioimmunotherapy medullary thyroid cancer carcinoembryonic antigen monoclonal antibodies
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