<qa>  What is the maximum amount of time for prior anti-lymphoma therapy?4. Prior anti-lymphoma therapy chemotherapy, immunotherapy or other investigational agent within 4 weeks prior to start of study treatment corticosteroid treatment at doses of 20 mgday, G-CSF or GM CSF are permitted up to 2 weeks prior to start of study treatment.. Note: excluding pre-treatment with rituximab as part of this study 