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Multiple myeloma also known as plasma cell myeloma or Kahler's disease .It is a cancer of plasma cells, a type of white blood cell normally responsible for producing antibodies. In multiple myeloma, collections of abnormal plasma cells accumulate in the bone marrow, where they interfere with the production of normal blood cells. Bisphosphonate treatment is often started along with chemo. If the areas of damaged bone continue to cause symptoms, radiation therapy may be used.
Recently the incidence rate of multiple myeloma (MM) has increased in Japan. Epidemiologic efforts have suggested that certain occupational and chemical exposures are likely to increase the risk for MM. We therefore performed a case-control study of MM, examining occupational factors. Data for 57 cases and 57 controls were obtained from Sapporo Medical University Hospital and its affiliated hospitals in Hokkaido. Controls were matched to each case by gender, age (+/- 5 years) and hospital.