Tons of questions about research. The more academic and research-heavy the program is, the more they will ask you about research. I had entire interview days where I spoke about nothing but research. No one actually scrutinized my publication record though and asked me to really describe a paper or abstract. Most were content with my 1 minute "executive summary/elevator pitch" about research and the conversation just segued from there.
You will have a lot of people asking you what exactly in heme onc you what to specialize in. If you already have something in mind, great. If you don't, I would actually recommend you to come up with something because it is kind of awkward to be too undifferentiated (most people want to tell you about Dr. so-and-so doing XYZ at their institution, and if you say "I don't know yet," it's hard to continue the conversation). Don't lie though, lest some annoying interviewer starts pimping you about the field that you feigned interest in. Also, don't say benign heme just because that's the least popular subfield and you'll get credits that way. One of my coresidents actually got burned when he showed up to interviews saying precisely that and thinking he would get some advantage by saying it.
But don't sweat the interviews too much. I only had one bad interviewer (out of several dozen) and this guy brazenly asked me, "why should we take you when the candidate who I just interviewed has more publications?" Needless to say, I was really turned off by this and the program automatically dropped several ranks on my final list.
