From personal experience/research and doing a 2 month clinical rotation there with the pancreatic attending, Hopkins is pretty progressive and bountiful in that nature. Moffitt in Florida, Im sure there are many others, but these are two that come to mind
Also, I believe that MDACC has a strong pancreatic program as well... You can look at the recent RTOG protocols too to get a sense of who's active in that clinical trial...