High placenta-specific 1/low prostate-specific antigen expression pattern in high-grade prostate adenocarcinoma.

Abstract

BACKGROUND:

The scarcity of effective therapeutic approaches for prostate cancer (PCa) has encouraged steadily growing interest for the identification of novel antigenic targets. Placenta-specific 1 (PLAC1) is a novel cancer-testis antigen with reported ectopic expression in a variety of tumors and cancer cell lines. The purpose of the present study was to investigate for the first time the differential expression of PLAC1 in PCa tissues.

METHODS:

We investigated the differential expression of PLAC1 in PCa, high-grade prostatic intraepithelial neoplasia (HPIN), benign prostatic hyperplasia (BPH), and nonneoplastic/nonhyperplastic prostate tissues using microarray-based immunohistochemistry (n = 227). The correlation of PLAC1 expression with certain clinicopathological parameters and expression of prostate-specific antigen (PSA), as a prostate epithelial cell differentiation marker, were investigated.

RESULTS:

Placenta-specific 1 (PLAC1) expression was increased in a stepwise manner from BPH to PCa, which expressed highest levels of this molecule, while in a majority of normal tissues, PLAC1 expression was not detected. Moreover, PLAC1 expression was positively associated with Gleason score (p ≤ 0.001). Interestingly, there was a negative correlation between PLAC1 and PSA expression in patients with PCa and HPIN (p ≤ 0.01). Increment of PLAC1 expression increased the odds of PCa and HPIN diagnosis (OR 49.45, 95 % CI for OR 16.17-151.25).

CONCLUSION:

Our findings on differential expression of PLAC1 in PCa plus its positive association with Gleason score and negative correlation with PSA expression highlight the potential usefulness of PLAC1 for targeted PC therapy especially for patients with advanced disease.

• Authors: Roya Ghods, Mohammad-Hossein Ghahremani, Zahra Madjd, Mojgan Asgari, Maryam Abolhasani, Sanaz Tavasoli, Ahmad-Reza Mahmoudi, Maryam Darzi, Parvin Pasalar, Mahmood Jeddi-Tehrani, Amir-Hassan Zarnani
• Journal: Cancer immunology, immunotherapy : CII (Cancer Immunol Immunother) Vol. 63 Issue 12 Pg. 1319-27 (Dec 2014) ISSN: 1432-0851 [Electronic] Germany
• PMID: 25186610 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers, Tumor
• Pregnancy Proteins
• KLK3 protein, human
• Kallikreins
• Prostate-Specific Antigen

Topics

• Adenocarcinoma (immunology, metabolism, pathology)
• Adult
• Aged
• Aged, 80 and over
• Biomarkers, Tumor (biosynthesis)
• Humans
• Immunohistochemistry
• Kallikreins (biosynthesis)
• Male
• Middle Aged
• Neoplasm Grading
• Pregnancy Proteins (biosynthesis)
• Prostate-Specific Antigen (biosynthesis)
• Prostatic Neoplasms (immunology, metabolism, pathology)
• Tissue Array Analysis