Learn about the three most important lines of latitude on Earth - the equator, Tropic of Cancer, and Tropic of Capricorn. Learn about the three most important lines of latitude on Earth - the equator, Tropic of Cancer, and Tropic of Capricorn.
General Discussion. Hairy cell leukemia (HCL) is a rare type of blood cancer characterized by abnormal changes in white blood cells known as B lymphocytes. The bone marrow creates too many of these defective cells, known as hairy cells because of the thin hair-like projections found on their surface.
It is caused by: 1  Lymphoid tumours. 2  Prolymphocytic leukaemia (PLL) 3  Hairy cell leukaemia (HCL) 4  Lymphomas with leukaemic expression. 5  Large granular lymphocytic leukaemia. 6  Acute lymphoblastic leukaemia (ALL) and chronic lymphocytic leukaemia (CLL).