Cancer and Leukemia Group B (CALGB; former name: Acute Leukemia Group B, ALGB) is a cancer research cooperative group in the United States. CALGB research is focused on seven major disease areas: leukemia, lymphoma, breast cancer, lung cancer, gastrointestinal malignancies, genito-urinary malignancies, and melanoma. In each of these areas, multi-modality treatment programs are designed by national experts. CALGB is headquartered at the University of Chicago in Chicago, Illinois and maintains its statistical centers at Mayo Clinic in Rochester, Minnesota and Duke University in Durham, NC.