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Related Experiment Videos

Shared T cell epitopes in epithelial tumors

G E Peoples1, R C Smith, D C Linehan

  • 1Laboratory of Biological Cancer Therapy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.

Cellular Immunology
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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Common tumor antigens recognized by T cells exist across various epithelial cancers, including ovarian, breast, and lung. This suggests a potential for developing a universal peptide-based cancer vaccine.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Human Leukocyte Antigen (HLA)-A2 and the HER2/neu proto-oncogene are crucial for T cell recognition in ovarian cancer.
  • These proteins are widely expressed in epithelial-derived tumors, indicating potential shared targets.

Purpose of the Study:

  • To identify common tumor-associated antigens in HLA-A2-positive, HER2/neu-positive epithelial cancers.
  • To assess the feasibility of a common peptide-based tumor vaccine for diverse epithelial cancers.

Main Methods:

  • Acid-elution of HLA-bound peptides from ovarian cancer tissues.
  • Fractionation of eluted peptides and reconstitution of T cell epitopes on the HLA-A2+ T2 cell line.
  • Generation of tumor-specific cytotoxic T lymphocytes (CTL) from tumor-infiltrating lymphocytes (TILs) of ovarian, breast, and non-small-cell lung cancers.

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Main Results:

  • CTLs recognized at least three common peptide fractions from multiple cancer elutions.
  • One identified peptide fraction co-eluted with a HER2/neu-derived peptide recognized by the same CTLs.
  • Demonstrated cross-reactivity of tumor-specific CTLs against shared peptide epitopes.

Conclusions:

  • Common tumor-associated antigens exist among HLA-A2+, HER2/neu+ epithelial cancers.
  • These findings support the theoretical possibility of a universal peptide-based cancer vaccine targeting shared tumor antigens.
  • Highlights the potential for broad application in treating various epithelial-derived malignancies.