Non-Hodgkin's Lymphoma (NHL)

Background: \- Researchers who are studying hairy cell leukemia, and how the disease compares with other disorders, are interested in obtaining additional samples from leukemia patients and healthy volunteers. The investigators are particularly interested in samples from individuals who have diseases that can be treated with a new type of drug called immunotoxin, in which an antibody carrying a toxin binds to a cancer cell and allows the toxin to kill the cell. Objectives: \- To collect a variety of clinical samples, including blood, urine, lymph samples, and other tissues, in order to study the samples and develop new treatments for leukemia. Eligibility: \- Individuals 18 years of age and older who have been diagnosed with leukemia or other kinds of blood and lymphatic system cancers, or who are healthy volunteers. Design: * Individuals who have leukemia will be asked to provide blood, bone marrow, urine, and tumor tissue samples as requested by the researchers. Healthy volunteers will provide only blood and urine samples. * No treatment will be given as part of this protocol.

The goal of this clinical trial is to Primary Objectives: 1. To compare the incidence of febrile neutropenia in patients with non-Hodgkin's lymphoma who received early or late granulocyte colony-stimulating factor (G-CSF) during standard chemotherapy in a multicenter study 2. To determine the incidence of leukopenia and neutropenia in patients with non-Hodgkin's lymphoma who received early or late G-CSF during standard chemotherapy in a multicenter study Secondary Objectives: 1. To determine changes in white blood cell, hemoglobin, and platelet levels in patients with non-Hodgkin's lymphoma who received early or late G-CSF during standard chemotherapy. 2. To determine the quality of life of patients with non-Hodgkin's lymphoma who undergoing standard chemotherapy and with neutropenia Researchers will compare the outcome between patients received either early G-CSF (within 72 hours) or late G-CSF (after 72 hours). All patients will be followed up to monitor for febrile neutropenia events, other hematological parameters and quality of life.