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.
Blood cancer is a type of cancer or tumor. Blood cancer hurts the blood, bone marrow, lymph, and lymphatic system. Sometimes more than one body part is hurt. The cause is usually different from other types of cancer. The way to find out if a person has this cancer is also different. The treatment is usually drugs. People with blood cancers see a kind of doctor called a hematologist (blood doctor) or oncologist (cancer doctor).