CD8A and neoplasm: Indeed, in one study comparing the effect of polymer chemistries on the response to a model antigen, ovalbumin (OVA), the 20:80 CPTEG : CPH formulation was superior to the 50:50 CPTEG : CPH formulation, inducing a greater CD8+ T cell and serum antibody responses, and resulting in longer protection against an OVA-expressing tumor cell line (53).