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.
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Abbreviations
- BPH:
-
Benign prostatic hyperplasia
- CI:
-
Confidence interval
- DAB:
-
Diaminobenzidine
- HPIN:
-
High-grade prostatic intraepithelial neoplasia
- IHC:
-
Immunohistochemistry
- OR:
-
Odds ratio
- PAP:
-
Prostate acid phosphatase
- PCa:
-
Prostate cancer
- PLAC1:
-
Placenta-specific 1
- PSA:
-
Prostate-specific antigen
- TMA:
-
Tissue microarray
- TRUS:
-
Transrectal ultrasound
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Acknowledgments
This study was funded by grants from Iran University of Medical Sciences (Grant No: 92-02-13-22395), and Tehran University of Medical Sciences (Grant No: 90-03-13-13530). The authors would like to thank Dr M. Bozorgmehr for carefully proofreading the manuscript, Mr. E. Mirzadegan for technical assistance and preparation of figures, and Mrs. J. Taeb for arranging clinicopathological data.
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All authors declare that there is no conflict of interest.
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Ghods, R., Ghahremani, MH., Madjd, Z. et al. High placenta-specific 1/low prostate-specific antigen expression pattern in high-grade prostate adenocarcinoma. Cancer Immunol Immunother 63, 1319–1327 (2014). https://doi.org/10.1007/s00262-014-1594-z
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DOI: https://doi.org/10.1007/s00262-014-1594-z