 2. Any major surgery, radiotherapy, cytotoxic chemotherapy, biologic therapy, immunotherapy, immunomodulatory drugs, experimental therapy within 4 weeks prior to the first dose of the study drugs. Note: Prior therapy with anti CD20 monoclonal antibody, anti CD52 monoclonal antibody, and lenalidomide are allowed. For oral targeted therapies such as idelalisib, venetoclax, a washout of 3 days is allowed. 