Antibodies against PC, PC conjugate or bioactive components and/or fragments thereof for use in combination therapy with one or more biologic agents and/or stem cells are disclosed, as well as compositions comprising the antibodies in combination with one or more biologic agents and/or stem cells. Also disclosed are PC conjugates, PC or bioactive components and/or parts/fragments thereof for use in activation immunotherapy prior to or in combination with treatment with biologic agents and/or stem cells for curing, treating, preventing, and/or reducing the risk of developing auto-immune diseases, chronic inflammatory diseases, and cancer diseases, as well as compositions comprising them in combination with biologic agents and/or stem cells.