(Undated) -- Leading cancer doctors are calling for major reform of America's safety net program for uninsured patients. Dr. Blase Polite with the American Society of Clinical Oncology says it's important to provide cancer prevention, screening, diagnosis, and treatment to every American. Twenty-seven states and the District of Columbia have chosen to expand Medicaid via the Affordable Care Act while 23 states have not. That leaves about four million people who don't make enough money to be able to go into the private exchanges. People can learn more about ASCO's efforts at www.asco.org/medicaid.