Administering a new form of immunotherapy to children with neuroblastoma, a nervous system cancer, increased the percentage of those who were alive and free of disease progression after two years. The percentage rose from 46 percent for children receiving a standard therapy to 66 percent for children receiving immunotherapy plus standard therapy, according to the study in the Sept. 30, 2010, New England Journal of Medicine. The randomized phase III clinical trial was coordinated by the Children’s Oncology Group (COG), a national consortium of researchers supported by the National Cancer Institute (NCI), part of the NIH.