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. 1986 Apr;21(3):183–187. doi: 10.1007/BF00199359

Drug localisation and growth inhibition studies of vindesine-monoclonal anti-CEA conjugates in a human tumour xenograft

G F Rowland 1, R G Simmonds 1,✉, V A Gore 1, C H Marsden 1, W Smith 1
PMCID: PMC11038923  PMID: 2421898

Abstract

The distribution of tritiated vindesine (3H-VDS) was studied in the tissues and tumours of athymic mice bearing a human colorectal tumour xenograft. Selective tumour localisation was obtained when 3H-VDS was injected as a conjugate with a monoclonal anti-CEA antibody (11.285.14) but not as a conjugate with a non-binding monoclonal IgG1 (Ag8) or as free succinoyl-VDS. The amounts of VDS that localised in the tumour following injections of 3H-VDS-11.285.14 increased in proportion to the amount injected, over a wide dose range. Conjugates prepared using the Fab fragments of 11.285.14 showed no evidence of selective tumour uptake in comparison with normal tissues.

Various dose levels of VDS-11.285.14 conjugate and free VDS were studied for effects on the growth of the tumour xenograft. A growth inhibition of 50% was obtained at 1.5 mg/kg with free VDS and at 2.5 mg/kg with conjugated VDS. The conjugate was, however, considerably less toxic.

Keywords: Growth Inhibition, Tumour Xenograft, Colorectal Tumour, Tumour Uptake, Inhibition Study

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