It is disclosed a method for obtaining a specific tumor antigen peptide repertoire loaded and/or activated dendritic cell comprising the steps of: a) exposing in suitable conditions a tumor cell expressing said specific tumor antigen peptide repertoire to at least one Pattern Recognition Receptor (PRR) agonist and/or to an inflammatory cytokine to obtain a tumor cell with an increased activity of at least one protein belonging to the group of connexins； b) co-culturing said tumor cell with an increased activity of at least one protein belonging to the group of connexins with dendritic cells, to get specific tumor antigen peptide repertoire loaded and/or activated dendritic cells； Step a) and b) are performed simultaneously or in sequence. The group of connexins preferably consists of connexin 43, connexin 40, connexin 45, connexin 47, connexin 50.
