2001h-154 antibodies antineoplasticagents biography cancer chronic chroniclymphocyticleukemia congresses gastrointestinalsystem healthrobins helicobacterinfections helicobacterpylori intestinalneoplasms leukemia lymphocytic lymphoma lymphomas marginalzone monoclonal monoclonalantibodies natalies newyork newyork(state) patients stomachneoplasms therapeuticuse therapy treatment wh250r149c2001 wh525r6571999