<qa>  What is a prospective study of oral ketamine versus placebo?This is a prospective, single center, double blind, randomized, two-arm feasibility study of oral ketamine versus placebo for the treatment of depression in depressed patients with cancer undergoing curative intent cancer therapy. Approximately 20 patients with cancer about to undergo cancer therapy will be randomized 1:1 to receive study treatment with one of the following regimens: 