Chronic lymphocytic leukemia (CLL) and prolymphocytic leukemia (PLL) are types of blood cancer. They develop in types of white blood cells called B cells or T cells, or the precursors to these cells.
Chronic lymphocytic leukemia (CLL) is a type of blood cancer that causes your bone marrow to make too many of a type of white blood cells called lymphocytes. Unlike other types of leukemia, it’s a ...