Only 350 cases of retinoblastoma are diagnosed a year in all of North America. It isn't your typical cancer and as such there really are only a few facilities in the country that have doctors that regularly treat the disorder. Children's Hospital in Los Angeles is among the world leaders. There are also excellent facilities in New York, Austin, Chicago, Ann Arbor, Houston, and a few other places. The best treatment tends to be at the best universities, like Texas, U. of Illinois Chicago, Michigan, etc. The facilities in NY and LA are at world renowned hospitals.
So yeah Salt Lake City is fine for treatment of normal cancer, but not so much for retinoblastoma.