A set of target peptides are presented by HLA A*0201, B*0301, B*0702 and B*2705 on the surface of disease cells. They are envisioned to, among other things, stimulate an immune response to the proliferative disease, e.g., colorectal cancer, to function as immunotherapeutics in adoptive T cell therapy or as a vaccine, facilitate antibody recognition of tumor boundaries in surgical pathology samples, act as biomarkers for early detection and/or diagnosis of the disease, and/or act as targets in the generation antibody-like molecules which recognize the target-peptide/MHC complex.