PROGRESSION‐FREE SURVIVAL FOLLOWING LENALIDOMIDE‐BASED TREATMENT IS SIGNIFICANTLY LONGER IN EXTRAGASTRIC THAN IN GASTRIC MARGINAL ZONE B‐CELL LYMPHOMA OF THE MUCOSA‐ASSOCIATED LYMPHOID TISSUE LYMPHOMA (MALT LYMPHOMA). (June 2017) - Kiesewetter, B.; Mayerhoefer, M.E.; Dolak, W.; Lukas, J.; Simonitsch‐Klupp, I.; Raderer, M.