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.
Plasma cell leukemia (PCL) is a rare, yet aggressive form of multiple myeloma characterized by high levels of plasma cells circulating in the peripheral blood.PIDEMIOLOGY. Plasma cell leukemia (PCL) is a rare variant of multiple myeloma that presents either as a progression of previously diagnosed multiple myeloma (ie, secondary PCL) or as the initial manifestation of disease (ie, primary PCL).