How do you approach thoracic treatment volumes for limited-stage small cell lung cancer?

Usually finding a target in LD-SCLC (limited disease, small cell lung cancer) is not a problem. The early days was very much cookie-cutter including both above clavicle regions, both hila and down to diaphragm. When the Intergoup trial was conceived in the late 80's, there was a need to define volum...