Primary refractory lymphoma or in second or subsequent relapse including after autologous or syngeneic stem cell transplant OR patients at a high risk for relapse defined as: (i) patients with primary refractory lymphoma or multiply relapsed lymphoma who are in remission but not eligible for autologous SCT or (ii) patients with relapsed lymphoma after autologous SCT who are in remission but not eligible for allogeneic SCT (Group A)