TY - JOUR
T1 - Antitumor effects of a human dimeric antibody fragment 131I- AFRA-DFM5.3 in a mouse model for ovarian cancer
AU - Zacchetti, Alberto
AU - Martin, Franck
AU - Luison, Elena
AU - Coliva, Angela
AU - Bombardieri, Emilio
AU - Allegretti, Marcello
AU - Figini, Mariangela
AU - Canevari, Silvana
PY - 2011/12/1
Y1 - 2011/12/1
N2 - AFRA-DMF5.3 is a human antibody fragment that, as a dimer, specifically binds to the α-folate receptor (FR) on ovary cancer cells. Pharmacokinetic and biodistribution parameters of 131I-AFRA-DFM5.3 after intravenous administration in animal models support its potential therapeutic use. We evaluated its preclinical specificity and therapeutic efficacy in tumor models. Methods: A negative control, AFRA-DFM6.1, was obtained by protein engineering. The activity and specificity of 131I-AFRA-DFMs were evaluated by systemic administration (intravenous) in subcutaneous tumor xenograft-bearing nude mice. Pharmacokinetics, biodistribution, and efficacy were assessed by intraperitoneal administration of 131I-AFRA-DFM5.3 in nude mice bearing 2 different intraperitoneal ovarian carcinoma xenografts. Treatments were tested at different doses and as single or double administrations 1 wk apart. Results: In subcutaneous models, 131I-AFRA-DFM5.3, but not the negative control, was found to reside on FR-positive tumor masses and significantly reduced tumor growth. In intraperitoneal models, early accumulation on free-floating clumps of ovarian cancer cells and solid peritoneal masses was evident after 1 h, and tumor uptake was stable for up to 3 h. The high tumor uptake determined the efficacy of 131I-AFRA-DFM5. 3. The best antitumor activity, with more than 50% of treated animals cured, was achieved with 2 locoregional treatments of intraperitoneally growing tumors on days 2 and 9. Conclusion: These results suggest that radioimmunotherapy with 131I-AFRA-DFM5.3 is feasible and leads to significantly prolonged survival. These preclinical data provide the basis for the rationale design of therapeutic treatments of ovarian cancer patients with a radiolabeled anti-FR antibody fragment.
AB - AFRA-DMF5.3 is a human antibody fragment that, as a dimer, specifically binds to the α-folate receptor (FR) on ovary cancer cells. Pharmacokinetic and biodistribution parameters of 131I-AFRA-DFM5.3 after intravenous administration in animal models support its potential therapeutic use. We evaluated its preclinical specificity and therapeutic efficacy in tumor models. Methods: A negative control, AFRA-DFM6.1, was obtained by protein engineering. The activity and specificity of 131I-AFRA-DFMs were evaluated by systemic administration (intravenous) in subcutaneous tumor xenograft-bearing nude mice. Pharmacokinetics, biodistribution, and efficacy were assessed by intraperitoneal administration of 131I-AFRA-DFM5.3 in nude mice bearing 2 different intraperitoneal ovarian carcinoma xenografts. Treatments were tested at different doses and as single or double administrations 1 wk apart. Results: In subcutaneous models, 131I-AFRA-DFM5.3, but not the negative control, was found to reside on FR-positive tumor masses and significantly reduced tumor growth. In intraperitoneal models, early accumulation on free-floating clumps of ovarian cancer cells and solid peritoneal masses was evident after 1 h, and tumor uptake was stable for up to 3 h. The high tumor uptake determined the efficacy of 131I-AFRA-DFM5. 3. The best antitumor activity, with more than 50% of treated animals cured, was achieved with 2 locoregional treatments of intraperitoneally growing tumors on days 2 and 9. Conclusion: These results suggest that radioimmunotherapy with 131I-AFRA-DFM5.3 is feasible and leads to significantly prolonged survival. These preclinical data provide the basis for the rationale design of therapeutic treatments of ovarian cancer patients with a radiolabeled anti-FR antibody fragment.
KW - Experimental radioimmunotherapy
KW - Folate receptor
KW - Human antibody fragment
KW - Ovarian cancer
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U2 - 10.2967/jnumed.110.086819
DO - 10.2967/jnumed.110.086819
M3 - Article
C2 - 22068897
AN - SCOPUS:83755168279
VL - 52
SP - 1938
EP - 1946
JO - Journal of Nuclear Medicine
JF - Journal of Nuclear Medicine
SN - 0161-5505
IS - 12
ER -