Abstract:
BACKGROUND:To enhance the efficacy of chemotherapy for medullary thyroid carcinoma (MTC), we evaluated the effect of combining radioimmunotherapy (RAIT) with 90Y-anticarcinoembryonic antigen (CEA) monoclonal antibody MN-14 and chemotherapy in nude mice bearing human MTC xenografts. A preliminary study evaluated doxorubicin, dacarbazine (DTIC), cyclophosphamide, and vincristine, singly and in combination, for their effect on the growth of MTC xenografts (TT) in nude mice. Given individually, DTIC yielded the most effective tumor growth inhibition, delaying the mean time to doubling from 1 week for untreated tumor-bearing mice to 7.5 weeks. Administering either the 4 drugs in combination or a 2-drug combination comprised of doxorubicin and DTIC significantly improved the efficacy compared with any single drug alone, increasing the mean doubling time to 10-12 weeks. METHODS:Drug doses were selected to conform to the doses of each drug given clinically. For the combined modality therapy, administration of 90Y-labeled anti-CEA monoclonal antibody MN-14 to nude mice bearing established TT tumors was followed by various chemotherapy regimens initiated 24 hours after RAIT. Chemotherapy protocols combined with RAIT included doxorubicin or DTIC alone and in combination, and the doxorubicin, DTIC, cyclophosphamide, and vincristine 4-drug protocol. Tumor volumes were measured weekly, and toxicity was evaluated by measuring blood counts and body weight. RESULTS:Combinations of RAIT and chemotherapy with DTIC or RAIT and chemotherapy with the drug combinations were found to augment the antitumor effects of RAIT or chemotherapy alone, without a significant increase in toxicity. The mean tumor volume doubling times were increased up to 100% compared with the results of chemotherapy alone. No significant differences in tumor growth were observed between the RAIT plus DTIC protocol and the RAIT plus two- or four-drug protocols. CONCLUSIONS:The superiority of the combined modality treatment argues for the integration of RAIT into chemotherapeutic regimens for MTC treatment. Clinical trials are needed to assess these principles in MTC patients.
journal_name
Cancerjournal_title
Cancerauthors
Stein R,Chen S,Reed L,Richel H,Goldenberg DMdoi
10.1002/cncr.10157subject
Has Abstractpub_date
2002-01-01 00:00:00pages
51-61issue
1eissn
0008-543Xissn
1097-0142pii
10.1002/cncr.10157journal_volume
94pub_type
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