The failure of the dams came as a big surprise. Johnstown had constructed an entire system designed to completely eliminate the flood risk. In addition, regular inspections had turned up no defects. Still, the dams were no match for the thunderstorm that stalled over the area on July 20.
Common types of blood cancer include: 1  Leukemia: Cancer that originates in blood-forming tissue. 2  Non-Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes, a type of white blood cell that helps the body fight infections. Non-Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes, a type of white blood cell that helps the body fight infections. 2  Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes.
Chronic lymphocytic leukemia, or CLL, is one of the many types of blood cancers. Blood cancers derive from the cells of the bone marrow and lymph nodes.ultiple Myeloma. This very complicated blood cancer is caused by the overgrowth in the bone marrow of an immune cell called a plasma cell, which secretes a protein into the bloodstream, called an âM-protein,â that can be detected by a test called an immunoelectrophoresis.