[Drug-resistant B cell chronic lymphocytic leukemia safely treated with rituximab to control leukemic cell increment and platelet transfusion dependence].

A 61-year-old man was found to have mild lymphocytosis during a medical checkup and was referred to our hospital in 1993. Physical examination showed a mild hepatomegaly, and bone marrow examination revealed the proliferation of monoclonal mature B cells. He was diagnosed with B-CLL.