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Comparison of therapeutic efficacy and biodistribution of (213)Bi- and (211)At-labeled monoclonal antibody MX35 in an ovarian cancer model.

Artikel i vetenskaplig tidskrift
Författare Anna Gustafsson
Tom Bäck
Jörgen Elgqvist
Lars Jacobsson
Ragnar Hultborn
Per Albertsson
Alfred Morgenstern
Frank Bruchertseifer
Holger Jensen
Sture Lindegren
Publicerad i Nuclear medicine and biology
Volym 39
Nummer/häfte 1
Sidor 15–22
ISSN 1872-9614
Publiceringsår 2012
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för radiofysik
Institutionen för kliniska vetenskaper, Avdelningen för onkologi
Sidor 15–22
Språk en
Länkar dx.doi.org/10.1016/j.nucmedbio.2011...
Ämneskategorier Cancer och onkologi, Radiologisk forskning

Sammanfattning

INTRODUCTION: The purpose of this study was to compare the therapeutic efficacy and biodistribution of the monoclonal antibody MX35 labeled with either (213)Bi or (211)At, both α-emitters, in an ovarian cancer model. METHODS: One hundred female nude BALB/c (nu/nu) mice were inoculated intraperitoneally with human ovarian cancer cells (OVCAR-3). Two weeks later, 40 of these mice were injected intraperitoneally with ∼2.7 MBq of (213)Bi-MX35 (n=20) or ∼0.44 MBq of (211)At-MX35 (n=20). Four weeks after inoculation, 40 new OVCAR-3-inoculated mice were injected with the same activities of (213)Bi-MX35 (n=20) or (211)At-MX35 (n=20). Presence of tumors and ascites was investigated 8 weeks after therapy. Biodistributions of intraperitoneally injected (213)Bi-MX35 and (211)At-MX35 were studied in tumor-free nude BALB/c (nu/nu) mice (n=16). RESULTS: The animals injected with (213)Bi-MX35 or (211)At-MX35 2 weeks after cell inoculation had tumor-free fractions (TFFs) of 0.60 and 0.90, respectively. The untreated reference group had a TFF of 0.20. The groups treated with (213)Bi-MX35 or (211)At-MX35 4 weeks after inoculation both had TFFs of 0.25, and the reference animals all exhibited evidence of disease. The biodistributions of (213)Bi-MX35 and (211)At-MX35 were very similar to each other and displayed no alarming activity levels in the investigated organs. CONCLUSIONS: Micrometastatic growth of an ovarian cancer cell line was reduced in nude mice after treatment with (213)Bi-MX35or (211)At-MX35. Treatment with (211)At-MX35 provided a non-significantly better result for the chosen activity levels. The radiolabeled MX35 did not accumulate to a high extent in the investigated organs. No considerable signs of toxicity were observed.

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