Medically reviewed by Amelia MacIntyre, DO There are different blood types: A, B, AB, and O, with each also being Rh-positive or Rh-negative.Knowing your blood type is important for safe blood ...

B-cell lymphoma refers to a group of cancers that attack the immune system. It is the most common type of non-Hodgkin’s lymphoma. The cancer grows in the B cells, also called B lymphocytes, which make ...