Sequences of Combination Chemotherapy Experiments

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Abstract
An experimental scheme is suggested for determining optimal combinations of two drugs. A first experiment uses three doses, chosen to cover the effective range (assumed known), of each of the pure drugs, and three corresponding doses of each of three mixtures. A second experiment is conducted in the region defined by the observed and estimated optimal treatments from the first experiment, and a quadratic surface fitted to selected results of the second experiment, or of both experiments, is used to obtain a revised estimate of the optimal treatment; if this estimate lies outside the range of treatments used in the second experiment a third should be performed. An example is given, using data derived from life-spans of leukemic mice treated with Amethopterin and Terephthalanilide.

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