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Expression of a tumor-associated antigen RCAS1 in hepatocellular carcinoma
K Noguchi1, M Enjoji, M Nakamuta
1Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, 812-8582, Fukuoka, Japan.
Abstract:
RCAS1 has been reported as a tumor-associated antigen in uterine and ovarian carcinomas. In vitro studies on RCAS1 indicated that it might function as an apoptosis-inducing factor since binding between RCAS1 and its receptor induced apoptosis in receptor-expressing cells. In this study, 68 surgically resected samples of hepatocellular carcinoma (HCC) were prepared and RCAS1 expression was examined immunohistochemically, because RCAS1 was also positive in all HCC cell lines tested. Clinical and pathological parameters were then compared between RCAS1-positive and -negative HCC cases. As a result, RCAS1 is expressed in 26.5% of HCC cases and vascular invasion is observed at a much higher rate in the RCAS1-positive cases (72.2%) than in RCAS1-negative cases (24.0%). RCAS1 is not an antigen specific for gynecological cancers. In HCC cases, the RCAS1-positive percentage is not high, however, RCAS1-positive HCCs exhibited a trend towards invasive character.
Insights
Receptor-binding cancer antigen 1 (RCAS1) is expressed in some hepatocellular carcinoma (HCC) cases. RCAS1-positive HCC tumors show a higher rate of vascular invasion, suggesting a role in tumor invasiveness.
Area of Science:
- Oncology
- Immunology
- Hepatology
Background:
- Receptor-binding cancer antigen 1 (RCAS1) is a known tumor-associated antigen in gynecological cancers.
- In vitro studies suggest RCAS1 may induce apoptosis upon receptor binding.
Purpose of the Study:
- To investigate RCAS1 expression in hepatocellular carcinoma (HCC).
- To correlate RCAS1 expression with clinical and pathological parameters in HCC, particularly vascular invasion.
Main Methods:
- Immunohistochemical analysis of RCAS1 expression in 68 surgically resected HCC samples.
- Comparison of clinical and pathological features between RCAS1-positive and RCAS1-negative HCC cases.
Main Results:
- RCAS1 was expressed in 26.5% of HCC cases.
- RCAS1-positive HCC cases exhibited a significantly higher rate of vascular invasion (72.2%) compared to RCAS1-negative cases (24.0%).
Conclusions:
- RCAS1 is not specific to gynecological cancers and is expressed in a subset of HCC.
- RCAS1 expression in HCC correlates with an increased trend towards invasive character, specifically vascular invasion.