The NCCN Non-Hodgkin ’ s Lymphomas Clinical Practice Guidelines in OncologyTM

Overview Non-Hodgkin’s lymphomas (NHLs) are a heterogeneous group of lymphoproliferative disorders originating in B-, T-, or natural killer (NK) lymphocytes. In the United States, B-cell lymphomas represent 80% to 85% of all cases, with 15% to 20% being T-cell lymphomas; NK lymphomas are very rare. In 2009, an estimated 65,980 new cases of NHL will be diagnosed and 19,500 will die of the disease.1 NHL is the sixth leading site of new cancer cases among men and fifth among women, accounting for 4% to 5% of new cancer cases and 3% to 4% of cancer-related deaths.1 The NCCN