The condition and the treatment
Lymphomas are cancers of the lymphatic system, part of the body's immune system. In non-Hodgkin's B‑cell lymphoma the B cells, a type of white blood cell produced in the bone marrow, grow and spread abnormally. Multiply relapsed or refractory means the cancer has come back several times or has not responded to treatment, and aggressive means that the cancer grows and spreads quickly, and causes severe symptoms.
Pixantrone (Pixuvri) is a chemotherapy drug that stops cancer cells growing and dividing.
NHS Choices (www.nhs.uk) may be a good place to find out more.