<qa>  What is a monoclonal antibody used to treat different types of lymphomas?Rationale: Previous research has demonstrated that rituximab has efficacy against chronic lymphocytic leukemia CLL and small lymphocytic lymphoma SLL. Rituximab is a monoclonal antibody used to treat different types of lymphomas. Monoclonal antibodies are a type of immunotherapy used against some types of cancer. They are produced in a laboratory and designed to target as well as bind with cells that carry specific proteins. Rituximab attaches to a protein called CD20 that is found almost exclusively on the surface of B-cells. Once rituximab attaches to the protein, the immune system activates to kill the malignant B-cells. Researchers are investigating what other therapies to combine with rituximab to reduce side effects and improve patient outcomes. The current study combines etanercept with rituximab. Etanercept is an anti-inflammatory agent being tested as a therapy for cancer. Researchers want to assess the theory that etanercept may reduce the toxicity associated with rituximab in patients and increase efficacy while providing its own treatment benefit to patients. 