Left behind: cancer disparities in the developed world.

Huge advances have been made in cancer treatments over recent decades; however, significant disparities still exist in the developed world on the basis of race, socioeconomic status, education level, geographical location, and immigration status and in the United States, insurance status. Cancer disparities persist in the continuum of cancer care from risk factors, screening, diagnosis, treatment, survivorship, and end-of-life care. The causes of disparities are complex and multifactorial. The MASCC (Multinational Association of Supportive Care in Cancer) Education Study Group would like to propose a framework of cancer disparities from a social perspective utilizing "social determinants of health" as delineated by the World Health Organization and highlight an unmet need for research and policy innovations to address cancer disparities in developed world.