Quinacrine-Capecitabine Combinatorial Therapy for Advanced Stage Colorectal Adenocarcinoma

Because of the well published safety profiles of both quinacrine and capecitabine, the Phase I portion of our study will aim to determine the tolerability of both agents in combinations when used at established clinical doses. This portion of the study will more closely resemble a pilot study or feasibility study rather than a dose escalation Phase I trial. The objective is to determine toxicities and adverse reactions, not a maximally tolerated dose. The investigators hypothesize that there will be no toxic interactions at the pharmacokinetic or pharmacodynamic level, and want to know the feasibility of using quinacrine and capecitabine at their respective recommended single agent doses. Because capecitabine is already regarded as standard treatment for colorectal cancer, the investigators will begin the study with a full dose of capecitabine combined with a slightly lower dose of quinacrine. If the safety-interim analysis does not detect an excess of toxicity, then subsequent patients will be enrolled using the full dose of both drugs.