Each year, the Interagency Autism Coordinating Committee (IACC) releases a list of scientific advances that represent significant progress in the field. The "2017 Summary of Advances" provides short, plain language summaries of the top research breakthroughs selected by the IACC from a pool of research articles nominated by the members. The 20 studies selected for 2017 have provided new insight into potential biomarkers to predict risk of autism spectrum disorder (ASD), developmental trajectories of children with ASD, and the impact of various prenatal exposures on ASD risk. The advances also include studies that investigated treatments and interventions for both ASD and co-occurring conditions, the impact of policy changes on ASD health care spending, patterns of injury mortality, and prevalence differences across demographic groups. Articles in the "IACC Summary of Advances" are grouped according to the topics represented by the seven questions of the "2016-2017 IACC Strategic Plan for ASD": (1) How Can I Recognize the Signs of ASD, and Why Is Early Detection So Important? (2) What Is the Biology Underlying ASD? (3) What Causes ASD, and Can Disabling Aspects of ASD Be Prevented or Preempted? (4) Which Treatments and Interventions Will Help? (5) What Kinds of Services and Supports Are Needed to Maximize Quality of Life for People on the Autism Spectrum? (6) How Can We Meet the Needs of People with ASD as They Progress into and through Adulthood? and (7) How Do We Continue to Build, Expand, and Enhance the Infrastructure System to Meet the Needs of the ASD Community? Citations for the articles selected for the Summary of Advances, as well as a complete listing of those nominated, are included at the end of the document. [For the 2016 Summary, see ED589773.]