Effect of AT7519M Alone and AT7519M Plus Bortezomib in Patients With Previously Treated Multiple Myeloma

"Part A: Nine patients will receive AT7519M as an intravenous infusion on days 1, 4, 8 and 11 of a three week cycle. The starting dose of AT7519M will be 21mg/m\^2/dose and will be increased to 27mg/m\^2/dose during subsequent cycles in the absence of AT7519M-related toxicities.~Part B: Amendment clarified there will be no further exploration of AT7519M as a monotherapy.~Part C: Amendment modified dose escalation to a conventional 3 + 3 design with a maximum total of 14 patients will be treated at the maximum tolerated dose."

Part C will treat between 3-26 patients with a combination of bortezomib and AT7519M in a dose escalation design. The starting doses for the dose escalation are bortezomib 1 mg/m2 and AT7519M 14 mg/m2.