Upregulation of tumour associated antigen RCAS1 is implicated in high stages of colorectal cancer.

Abstract:

BACKGROUND:RCAS1 (receptor binding cancer antigen expressed on SiSo cells) is a tumour associated antigen. It is involved in immune evasion by tumour cells, by binding to receptors on cells involved in the immune response, such as T cells and natural killer cells, and inducing apoptosis. High expression of RCAS1 has been demonstrated immunohistochemically in tumours of the cervix, breast, lung, and stomach; however, the expression of RCAS1 has never been investigated in colorectal cancer. AIMS:To investigate the expression of RCAS1 in colorectal cancer and identify at which stages of colorectal carcinogenesis it is expressed. METHODS:Sixty surgically resected colorectal cancer specimens obtained from Rajavithi Hospital, Bangkok, Thailand were studied. RCAS1 expression was detected immunohistochemically using monoclonal anti-RCAS1 antibody. RCAS1 mRNA expression was also investigated by reverse transcription polymerase chain reaction in the freshly isolated tissues, and serum RCAS1 was measured by enzyme linked immunosorbent assay. RESULTS:Staining for the RCAS1 protein was intense in high stages of colorectal cancer, but weak in normal tissues. The RCAS1 mRNA results correlated with the immunohistochemistry results. Positive serum RCAS1 concentrations were found in 10 of 18 patients with stage II disease and 12 of 32 with stage III and IV, but not in patients with stage I disease. All lymph node and liver metastases showed high expression of RCAS1 protein. CONCLUSIONS:RCAS1 appears to be upregulated in high stages of colorectal cancer, both in the serum and the tissue. RCAS1 expression might be a useful additional criterion for staging this cancer.

journal_name

J Clin Pathol

authors

Leelawat K,Watanabe T,Nakajima M,Tujinda S,Suthipintawong C,Leardkamolkarn V

doi

10.1136/jcp.56.10.764

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

764-8

issue

10

eissn

0021-9746

issn

1472-4146

journal_volume

56

pub_type

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