The increased cost of novel treatments without adequate assessment of how they affect patient outcomes is a pressing concern given that inappropriate use of expensive technologies is one of the key factors that threaten the affordability of cancer care in the United States. To explore these issues further, the National Cancer Policy Forum (NCPF) of the Institute of Medicine organized a workshop in July 2015. This is the third NCPF workshop in a series examining the affordability of cancer care. Participants explored clinical benefits and comparative effectiveness of emerging advanced technologies for cancer treatment in radiation therapy and surgery and potential strategies to assess the value and promote optimal use of new technologies in cancer treatment. This report summarizes the presentations and discussions from the workshop.