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• W2103507211 abstract "The epithelial glycoprotein 40 (EGP40) is an important target in the clinic for radioimmunolocalization and monoclonal antibody (MAb)-mediated therapy of cancer. We determined which tumor-related factors (including antigen distribution and density, vascularization and perfusion) were involved in the uptake of the anti-EGP40 MAb 323/A3 in 4 different human ovarian cancer xenografts grown s.c. in nude mice. The reactivity pattern of 323/A3 in all xenografts in vitro was similar and showed a strong and homogeneous distribution of the EGP40 antigen. FMa xenografts, however, showed the highest uptake of 323/A3 in vivo, which was 5.5-, 6.2- and 10.0-fold higher than that in OVCAR-3, Ov.Pe and Ov.Sh xenografts, respectively. FMa xenografts contained 2.1- to 3.5-fold more antigen per gram protein when compared with the antigen content of the other xenografts. FMa and Ov.Sh xenografts demonstrated a better vascularization pattern, whereas Ov.Pe and OVCAR-3 xenografts were moderately to poorly vascularized. FMa xenografts were also better perfused, as was shown by a 1.6- to 1.8-fold higher uptake of the 99mTc-labeled blood flow marker hexamethylpropyleneamine oxime (HMPAO). The tumor uptake of the non-specific MAb E48 was 2.2- to 11.2-fold lower when compared with that of 323/A3, but the sequence of uptake was similar (FMa > OVCAR-3 = Ov.Pe > Ov.Sh), indicating the lowest extravasation of MAbs in Ov.Sh xenograft tissue. Since both the antigen content and the perfusion appeared to be important factors of influence on the tumor uptake of 323/A3, attempts were made to manipulate these determinants to improve the tumor uptake. Neither γ-interferon nor 5-fluorouracil were able to increase EGP40 expression in human ovarian cancer cells in vitro. Treatment of tumor-bearing mice with the calcium-antagonist flunarizine did not result in an improved perfusion, although a slight increase in the initial tumor uptake of 323/A3 was observed in Ov.Sh-bearing mice. Our results illustrate the relative contribution of various tumorrelated factors that determine the usefulness of a MAb for imaging and therapy of cancer. Int. J. Cancer 71:237–245, 1997. © 1997 Wiley-Liss, Inc." @default.
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• W2103507211 date "1997-04-10" @default.
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• W2103507211 title "Determination of tumor-related factors of influence on the uptake of the monoclonal antibody 323/A3 in experimental human ovarian cancer" @default.
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• W2103507211 doi "https://doi.org/10.1002/(sici)1097-0215(19970410)71:2<237::aid-ijc19>3.0.co;2-e" @default.
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