CD4 and colon carcinoma: Lastly, systemic expansion and liver accumulation of PBC-suppressing PDC-E2-specific TR1-like CD4+ T-cells (Fig. 10f–n) did not impair the ability of pMHC-NP-treated NOD.c3c4 mice to mount immune responses against allogeneic colon carcinoma (CT26) and melanoma (B16/F10) liver metastases arising upon intra-splenic injection, as compared to untreated NOD.c3c4 mice or syngeneic hosts (Balb/c and C57BL/6J, respectively) (Fig. 10i–q).