Growth rate of human tumour xenografts measured in nude mice by in vivo cast modelling.

Caliper measurement of xenograft tumour volume incurs shape-dependent errors of up to 230 per cent. A more sensitive and accurate method is described for repeated in vivo measurement of tumour volume by cast modelling. The technique can provide electronic data for further analysis and its accuracy and limitations can themselves be determined. Week-on-week changes in tumour volume may be detected with up to 99 per cent confidence.