Are you looking for supportive additional treatments for you as a person or anti-cancer treatments? If the first, my surgeon suggested acupuncture and I gather it can be helpful for post surgical pain. There are massage therapists who specialize in cancer patients.
However, supplements etc. tend to be unproven, unregulated, and expensive. Alternative treatments that do work tend to have side effects etc. For example, a holistic healer recommended mistletoe infusions to me for breast cancer as that is common in Europe. However, these are indeed invasive and have side effects. And in the US as a rule they are not given by doctors. So be very cautious about invasive "holistic" treatments. And of course you need to tell your oncologist about anything you are doing.
Hope you find what you need!