BTW, I mentioned Professor Lisa Butterfield. I think you didn't pay any attention.
Professor Lisa Butterfield is a well-renowned scientist on dendritic cell vaccine too. She used to be the chair of Cellular, Tissues and Gene Therapies Advisory Committee of FDA for four years before she joined Merck last March. She ran a clinical trial using her own version of DC vaccine on melanoma. But she didn't make any breakthrough. Together with Antoni Ribas, she published plenty papers dendritic cells and immunotherapy. I really doubt that Merck would develop its own DC vaccine since the patent wall built by LP over the past many years would block any BP from such an attempt.