American doctors and hospitals have been dealing with drug shortages for the past decade. Shortages of chemotherapy and other cancer-fighting agents have been particularly frequent. And when the cancer patients are children, it’s especially difficult for their doctors. They have to make tough decisions about who gets potentially life-saving drugs and who does not. A group of pediatric cancer specialists just released guidelines on allocating scarce medications. We discuss what’s behind the drug shortfalls and what government regulators, the pharmaceutical industry and hospitals say needs to be done.