B cell lymphoma refers to types of Non-Hodgkin lymphoma that are characterised by abnormalities of the "B cells" (a type of white blood cell that makes antibodies to help fight infection). B cell lymphoma may grow and spread slowly with few symptoms (also known as indolent lymphoma) or may be very aggressive with severe symptoms.
Diffuse large B-cell lymphoma (DLBCL), a form of Non-Hodgkin lymphoma, is the most common blood cancer. Lymphomas occur when cells of the immune system, known as B lymphocytes, grow and multiply uncontrollably. DLBCL occurs mostly in adults and is a fast-growing (aggressive) lymphoma. It can start in the lymph nodes or outside of the lymphatic system in the gastrointestinal tract, testes, thyroid, skin, breast, bone, or brain. Often, the first sign of DLBCL is a painless rapid swelling in the neck, armpit, abdomen, or groin caused by enlarged lymph nodes. For some people, the swelling may be painful. Other symptoms include night sweats, unexplained fevers, and weight loss.
Non-Hodgkin lymphoma (also known as Non-Hodgkin's lymphoma, NHL, or sometimes just lymphoma) is a cancer that starts in a type of white blood cells called lymphocytes, which are part of the body’s immune system. NHL is a term that's used for many different types of lymphoma that all share some of the same characteristics. NHL usually starts in lymph nodes or other lymph tissue, but it can sometimes affect the skin.
Relapsed refers to when a patient has received active treatment, went off treatment and then the disease came back, whereas refractory refers to disease that is progressing despite active treatment.