Merck the maker of Keytruda and Moderna the maker of mRNA vaccines are in partnership. They are running trials now using a combination of Keytruda and targeted vaccines created for individual patients based upon their specific tumor. The results thus far are very encouraging. I hope the link below will take you to the article I have referenced. One thing more are your thoughts, which have real power that can greatly influence the results you are seeking. Do your best to keep any doubts at bay because a treatment that will work for you is just around the corner.