A Comprehensive Cancer Center may not be your only option, just that they have have some kind of accreditation or certification from the feds...there are only about 25 in the US (we have 2 here in SE Michigan). Most major hospitals will have a cancer center too, just does not have the CCC credentials. I hear local commercials for different hopsitals that have a cancer center, and with the prevalence of breast cancer, they are sure to have a breast clinic. That would mean that on a certain day of the week, for example, they see only breast patients.
I go to the cancer center at Univ of Michigan. I know that people just like you come there for evaluation of breast conditions, even if it is not cancer or not known. Same with mammograms and radiology, the waiting room is full of regular screening folks, not just cancer evals. You might even go online for some local or regional hospitals to look up their programs. You would get details about their offerings.
Not that we encourage folks to be hypochondriacs, but this is your body and your life, and we want you to be comfortable with the decisions made by the doc.
Oregon....you may be a first for us! We're all over the US and have had folks from Canada, New Zealand and Wales.