The invention relates to therapy and methods of applying the therapy to a patient. The invention includes the introduction of immature dendritic cells into the patient and the introduction of PD-1 and/or PD-L1 inhibitor into the patient. The immature dendritic cells are introduced intratumorally and/or through vessel and the PD-1 and/or PD-L1 inhibitor is introduced intratumorally and/or through vessel and/or subcutaneously. The immature dendritic cells can be formed by collecting monocyte cells from the patient and culturing the cells in a culture medium. The invention can be effective to regress, reduce or eliminate tumor cells in tumor tissue of the patients, including metastasized tumors. Further, the treatment of the invention is effective in the absence of conventional therapy, such as radiotherapy and chemotherapy.
