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Immunization of patients with the hTERT:540-548 peptide induces peptide-reactive T lymphocytes that do not recognize tumors endogenously expressing telomerase.

AbstractPURPOSE:
Telomerase is an attractive target antigen for cancer immunotherapies because it is expressed in >85% of human tumors but is rarely found in normal tissues. A HLA-A*0201-restricted T-cell epitope was previously identified within telomerase reverse transcriptase hTERT:540-548. This peptide was reported to induce CTL that recognized tumor cells and transfectants that endogenously expressed telomerase. Therefore, we initiated a clinical protocol to evaluate the therapeutic and immunological efficacy of this peptide.
EXPERIMENTAL DESIGN:
Fourteen patients with metastatic cancers were vaccinated with hTERT:540-548 emulsified in incomplete Freund's adjuvant.
RESULTS:
In 7 patients, peripheral blood mononuclear cells collected after immunization recognized hTERT:540-548, whereas those collected before vaccination did not. However, none of these CTLs recognized tumors that endogenously expressed telomerase, and none of the patients had an objective clinical response. Several highly avid T-cell clones were generated that recognized T2 cells pulsed with <or=1 nm hTERT:540-548, but none of these recognized HLA-A*0201(+) hTERT(+) tumors or cells transduced with the human telomerase reverse transcriptase (hTERT) gene. Also, an antibody specific for hTERT:540-548/HLA-A*0201 complexes stained peptide-pulsed cells but not telomerase(+) tumors.
CONCLUSIONS:
Our results are discordant with previous studies and those of a clinical trial that claimed peripheral blood mononuclear cells from patients vaccinated with peptide-pulsed dendritic cells lysed hTERT(+) tumors. However, our findings are consistent with a previous study that demonstrated that the hTERT:540-548 peptide is cleaved in the proteasome. These results suggest that hTERT:540-548 is not presented on the surfaces of tumor cells in the context of HLA-A*0201 and will not be useful for the immunotherapy of patients with cancer.
AuthorsMaria R Parkhurst, John P Riley, Takehito Igarashi, Yong Li, Paul F Robbins, Steven A Rosenberg
JournalClinical cancer research : an official journal of the American Association for Cancer Research (Clin Cancer Res) Vol. 10 Issue 14 Pg. 4688-98 (Jul 15 2004) ISSN: 1078-0432 [Print] United States
PMID15269141 (Publication Type: Clinical Trial, Journal Article, Randomized Controlled Trial)
Chemical References
  • HLA-A Antigens
  • HLA-A*02:01 antigen
  • HLA-A2 Antigen
  • Peptide Fragments
  • RNA, Messenger
  • telomerase reverse transcriptase (540-548)
  • Telomerase
Topics
  • Adult
  • Aged
  • Cell Line
  • Cell Line, Tumor
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Gene Expression
  • HLA-A Antigens (genetics, immunology, metabolism)
  • HLA-A2 Antigen
  • Humans
  • Immunization
  • Male
  • Middle Aged
  • Neoplasm Metastasis
  • Neoplasms (enzymology, immunology, therapy)
  • Peptide Fragments (genetics, immunology, metabolism)
  • RNA, Messenger (genetics, metabolism)
  • T-Lymphocytes (immunology)
  • T-Lymphocytes, Cytotoxic (immunology)
  • Telomerase (genetics, immunology, metabolism)

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