Abstract
A multicentre validation study of the acute in vitro cytotoxicities of 31 liquid or solid chemicals was carried out by six laboratories, using primary rat hepatocyte cultures as a model system. We report here a comparison of neutral red uptake IC50 and LD50 values. Oral, i.p. and i.v. LD50 values were available for 27, 24 and 18 chemicals, respectively, and an IC50 value was obtained for 15, 14 and 11 of these compounds, respectively. A significant correlation was found only between IC50 and i.v. LD50 values.
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