This program probes the latest developments in cancer research, including some aspects of research to make cigarettes smoking safe. At Issue camera crews visit Palm Beach, Florida, where the American Cancer Society seminar for science writers was held during the last week in March, and doctors who are doing cancer research at their laboratories. Among those doctors who will be shown at work will be Nobel Prize winner Dr. Szent-Gyorgyi, director of the Institute for Muscle Research of the Marine Biological Laboratory in Wood Hole, Massachusetts. Dr. Szent-Gyorgyi told the seminar last week that a possible treatment of cancer may come soon with the chemical identification of a naturally occurring material that has inhibited cancerous growth in animals during tests. The guests include Dr. Ruth Sagen, department of zoology, Columbia University; Dr. Morton Levin of Roswell Park Memorial Institute, Buffalo, New York; Dr. James T. Nix of Nix Clinic, Spokane Washington; Dr. Samuel K. McIlvanie, Rockwood Clinic, Spokane, Washington; Miss Mildred Spencer, science writer for the Buffalo Evening News. Running Time: 28:30 (Description adapted from documents in the NET Microfiche) At Issue consists of 69 half-hour and hour-long episodes produced in 1963-1966 by NET, which were originally shot on videotape in black and white and color.