- Phase I: Beginning 9-11 days before vaccination, patients undergo leukapheresis for collection of peripheral blood mononuclear cells (PBMCs). PBMCs are processed for the generation of dendritic cells (DC) to be used for vaccinations. PBMCs are transfected with RNAs encoding for Melan-A, MAGE-3, and survivin antigens. DC are pulsed with keyhole limpet hemocyanin (KLH) for some patients.