Glenn Lightner in 2012 at age 13. His father searched clinicaltrials.gov for years, to no avail, hoping to find a promising experimental cancer treatment that might save his son's life. Courtesy of Lawrence Lightner hide caption

itoggle caption Courtesy of Lawrence Lightner

Nurses assist a new patient at an Ebola center in Liberia's Lofa County. As drug trials get underway, patients may receive experimental medicines. Tommy Trenchard/NPR hide caption

itoggle caption Tommy Trenchard/NPR