@indyguy and @jc76, "Cancer Centers of Excellence" (COEs) are healthcare facilities recognized for their high standards in cancer treatment, research, and patient care, often through formal designations. Examples include NCI-Designated Comprehensive Cancer Centers in the U.S., which are leading research institutions, and specific programs. There are 73 NCI-Designated Cancer Centers. Here's how to find them

- NCI-Designated Cancer Centers https://www.cancer.gov/research/infrastructure/cancer-centers

There is also a designation called National Cancer Institute-Designated Comprehensive Cancer Center, a category to which Mayo Clinic belongs.
- Mayo Clinic Comprehensive Cancer Center https://www.mayoclinic.org/departments-centers/mayo-clinic-cancer-center