To explore this effect and, in particular, to determine SAR in potentiating the toxicity of anticancer drugs, a range of indomethacin analogues was synthesised and their activity tested in our screens (hereafter described as combination toxicity assays). Indomethacin Figure 1, Scheme 4 and Scheme 6 was a logical candidate for investigation as its structure is very amenable to modification to establish the influence of the various substituents, for example the role of the 5-methoxy, ...