I'm betting this is true at many of the cancer centers but we found Sloan to have a whole person approach.
While my husband's plan was radiation and chemo, he was referred to a dietician who met with us several times, offered a smoking cessation specialist and a therapist if he felt he needed it. At every visit, the nurses and doctors checked into how he was doing medically and emotionally. After treatment, they reminded him to walk regularly, to build his body back up,etc.
There are many things patients can do to help heal their bodies.
And working WITH your medical team on it is encouraged. I think that's why where you go is so often emphasized here.