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.
Click for high-res version. Leukemias are blood-and bone marrow cancers categorized by which type of blood cell they affect and how quickly they progress. Leukemia arises in the two main types of white blood cells: Lymphoid and meyloid cells. Fast-growing leukemias are called acute leukemias.Slower-growing leukemias are called chronic leukemias. Fred Hutch is a world leader in leukemia research.lick for high-res version. Leukemias are blood-and bone marrow cancers categorized by which type of blood cell they affect and how quickly they progress. Leukemia arises in the two main types of white blood cells: Lymphoid and meyloid cells. Fast-growing leukemias are called acute leukemias.