http://www.childrensoncologygroup.org/

It's a National Cancer Institute-supported clinical trials cooperative group devoted exclusively to childhood and adolescent cancer research. C.O.G. develops and coordinates cancer clinical trials conducted at the 238 member institutions, which include cancer centers of all major universities and teaching hospitals throughout the U.S. and Canada, as well as sites in Europe and Australia. C.O.G. members include over 5000 cancer researchers dedicated to saving the lives of children with cancer.