A lot more scheduling, money, and effort goes into preparing MD/PhD interviews compared to MD ones. First, you meet with many more faculty and the program administrators go to great lengths to manage everyone's schedules. Second, they often provide meals, hotels/lodging, transportation, etc which they pay using their program grant. They basically treat you really nicely the whole time. I didn't mean to imply in my last message that you should go and pretend like you're interested. Certainly, if you have absolutely no intention of ever attending the school, I think it would be most ethical to cancel, as the above posters suggest. It would have been prudent to cancel earlier, but I guess this may have been unavoidable. However, my sense was that there was a "preference" for the school that had accepted Original, but not necessarily a 100% certainty. I don't think it is unethical to go to an interview if you prefer a different school, as actually touring the other place may change your mind or cause you to reconsider. You have earned the interview, so there is nothing questionable about that. MD/PhD programs vary a lot more than do medical schools in a variety of ways. Therefore, the decision on where to attend is quite complex. My point above was that you just should be careful and if you do decide to cancel, do it in a way that avoid burning bridges. Hope this helps. 😀