In what specialties is it important to do in-field research for matching?

I'm about to matriculate into a program where students do a year of dedicated research and have to begin considering mentors now. I know some fields appreciate research regardless of the study subject, while some prefer the research is related to the speciality. For example, nephro might like that I did a study on bone cancer, while derm wouldn't care as much because it isn't derm related. I guess the question is, what are the other "derm" fields? Rad onc? Ortho? Uro? Thanks.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums