"Ask the Expert” features answers by our experts to your clinical questions. Question: What is the role of PET-CT in evaluating the interim response of lymphoma to treatment?Answer: That’s an interesting question. There have been relevant data presented at the last two or three ASCO and ASH meetings on this topic.The study of interim PET scan is inherently controversial because of issues related to reproducibility, false-positives, grey-zone SUV values, and lack of good harmonization criteria, in...