Summary
Background
DMP 840 is a compound from a class of bis-naphthalimide antitumor agents that recently completed Phase I clinical trials at three North American centers and is currently undergoing Phase II testing. Preclinically, it was shown to have curative activity against a variety of human tumor xenograft models.
Purpose
To test DMP 840 bothin vitro andin vivo for antiproliferative activity against predominantly mouse tumor models.
Methods
A disk diffusion soft agar colony formation assay was used to determine thein vitro growth inhibitory activity against a selection of mouse and human tumor cell lines, and the comparable selective mouse solid tumors were used forin vivo testing.
Result
In vitro DMP 840 exhibited equal cytotoxicity for human tumors (including MX-1 directly cultured from nude mice), mouse tumors and normal cells.In vivo DMP 840 was only modestly active or inactive against the following mouse tumors: Mam 16/C, T/C=30% (T/C=Percent Tumor Growth Inhibition); Mam 16/C/ADR, T/C=33%; Colon 38, T/C=9%; Panc 03, T/C=53%; Colon 51/A, T/C=28%; Pane 02, T/C= 52%; P388/0, 36% ILS (Percent Increased Life Span) and P388/ADR, 14% ILS. Furthermore, the antitumor activity was only observed at the highest non-toxic dose and was associated with a large body weight loss. In contrast, the agent was highly active against the human breast tumor MX-1 implanted subcutaneously in either athymic nude or SCID mice (Nudes: T/C=0%; 1/5 cures; SCIDS: T/C=0%; 5/5 cures).
Conclusions
Although there was no selective cytotoxicity in our clonogenic assay for human versus mouse tumor cell lines, selective activityin vivo for human xenograft tumors was noted. Overall, this compound is rather unique in its differential degree ofin vivo activity for human versus mouse tumors.Implications: Phase II trials, which are ongoing, will help determine if the preclinicalin vivo selective activity of DMP 840 translates to clinical activity in man.
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LoRusso, P., Demchik, L., Dan, M. et al. Comparative efficacy of DMP 840 against mouse and human solid tumor models. Invest New Drugs 13, 195–203 (1995). https://doi.org/10.1007/BF00873800
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DOI: https://doi.org/10.1007/BF00873800