The Association of American Cancer Institutes (AACI) is a membership association of 102 academic and freestanding cancer research centers in the United States and Canada. AACI's membership roster consists of National Cancer Institute (NCI)-designated centers and academic-based cancer research programs that receive National Institute of Health (NIH) and NCI support. The association is headquartered in the Boston University School of Medicine and Boston Medical Center (BMC). AACI cancer centers serve as the headquarters for most NCI-sponsored clinical trials.