NY-ESO-1 protein expression in primary breast carcinoma and metastases: correlation with CD8+ T-cell and CD79a+ plasmacytic/B-cell infiltration

Int J Cancer. 2007 Jun 1;120(11):2411-7. doi: 10.1002/ijc.22376.


NY-ESO-1 is a cancer testis antigen expressed in various malignancies and testicular germ cells. Because of its capacity to induce specific humoral and cellular immunity in patients with NY-ESO-1-positive carcinomas, it represents a promising target for cancer immunotherapy. In breast cancer, NY-ESO-1-mRNA was reported in up to 42%, but protein expression has not been determined to larger extent. In the present tissue microarray-based study, primary breast cancers (n = 1,444), in situ lesion (n = 148), recurrences (n = 88), lymph node (n = 525) and distant metastases (n = 91) were studied for NY-ESO-1 expression by immunohistochemistry. NY-ESO-1-protein expression was compared with mRNA expression by real-time PCR. NY-ESO-1-protein was detected in 3.1% (4/128) in situ lesions and in 2.1% (28/1355) invasive breast cancer. There were 1.8% (9/493) NY-ESO-1-positive lymph node and 5.1% (4/78) positive distant metastases. NY-ESO-1 was more frequently expressed in grade 3 (4.9%) than in grade 2 (0.8%) and grade 1 (0.5%) carcinomas (p < 0.0001). Presence of tumor-infiltrating CD8+ T-cells correlated with NY-ESO-1 (p < 0.0001) on the tissue microarray. On randomly selected large sections, 4 out of 9 NY-ESO-1-positive tumors displayed a brisk infiltrate of CD79a+ plasmocytes/B-cells, but none of 10 NY-ESO-1-negative tumors (p < 0.05). NY-ESO-1-mRNA expression was detected in frozen samples of NY-ESO-1-protein positive (n = 6) and negative breast cancers (n = 8) and in normal testis. Comparison between mRNA and protein expression revealed that only breast cancers with NY-ESO-1-mRNA levels comparable or higher than testis expressed NY-ESO-1-protein. These findings suggest that NY-ESO-1-positive breast cancers represent a small subset of poorly differentiated tumors with evidence of cellular and humoral immune response.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Antigens, Neoplasm / metabolism*
  • B-Lymphocytes / immunology*
  • Breast Neoplasms / immunology
  • Breast Neoplasms / metabolism*
  • CD79 Antigens / immunology*
  • CD8-Positive T-Lymphocytes / immunology*
  • Female
  • Humans
  • Immunohistochemistry
  • In Situ Hybridization, Fluorescence
  • Lymphocytes, Tumor-Infiltrating / immunology
  • Membrane Proteins / metabolism*
  • Middle Aged
  • Polymerase Chain Reaction


  • Antigens, Neoplasm
  • CD79 Antigens
  • CTAG1B protein, human
  • Membrane Proteins