Identification, optimization and use of shared HLA-B*0702 epitopes for immunotherapy
The present invention provides novel methods and materials for efficiently treating patients having an HLA-B*0702 phenotype, based on peptides representing shared epitopes of tumor antigens. In particular, the invention relates to a method for identifying a HLA-B*0702-restricted peptide which can trigger a cytotoxic response against several antigens from one single multigenic family, and to several such epitopes.
1. An isolated peptide consisting of a HLA-B*0702-restricted epitope selected from the group consisting of SEQ ID NO:52 to 54.
2. A chimeric polypeptide, comprising two or more HLA-B*0702-restricted epitopes selected from the group consisting of SEQ ID NO:32-67.
3. A composition comprising at least, as an active ingredient, the isolated peptide according to claim 1 , or the chimeric polypeptide according to claim 2 , and further comprising a pharmaceutical carrier.
4. A kit of parts comprising, in separate containers:
(i) a first peptide comprising a HLA-B*0702-restricted epitope, wherein said first peptide is a chimeric polypeptide comprising two or more HLA-B*0702-restricted epitopes selected from the group consisting of SEQ ID NO: 2 to 31, and
(ii) a second peptide consisting of the chimeric polypeptide of claim 2 .
5. The kit according to claim 4 , wherein said first peptide comprises a sequence selected from the group consisting of SEQ ID NO: 15, SEQ ID NO: 16 and SEQ ID NO: 17, and said second peptide comprises the sequence of SEQ ID NO: 54.
6. The kit according to claim 4 , which is a vaccination kit, wherein said first and second peptides are in separate vaccination doses.
7. The isolated peptide according claim 1 , wherein the HLA-B*0702-restricted epitope consists of the sequence of SEQ ID NO: 52.
8. The isolated peptide according claim 1 , wherein the HLA-B*0702-restricted epitope consists of the sequence of SEQ ID NO: 53.
9. The isolated peptide according claim 1 , wherein the HLA-B*0702-restricted epitope consists of the sequence of SEQ ID NO: 54.