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Loss of MHC class‐I expression in cervical carcinomas

Loss of MHC class‐I expression in cervical carcinomas The expression of MHC class‐I antigens was analysed in 67 cervical carcinoma biopsies; 16% of the biopsies showed complete or heterogeneous loss of HLA expression as judged by reactivity with antibodies recognizing monomorphic determi nants of the class‐I heavy chain bound to β2 microglobulin (β2m). In addition, other biopsies showed a loss in expression of particular allelic products: 23% for HLA‐A2; 17% for HLA‐A3; 23% for HLA‐Bw4 and 19% for HLA‐Bw6. Three biopsies showed changes at 2 alleles, 2 of which were at both HLA‐A and ‐B loci. Down‐regulation of class‐I expression may be virally mediated and HPV DNA is frequently found in cervical carcinomas. However, there appeared to be no direct correlation between the detection of HPV 16 or 18 DNA in these tumours and changes in HLA expression. There was also no correlation with the expression of the oncofoetal antigen 5T4. Our results show that a significant proportion (at least 30%) of the cervical carcinomas showed some alteration in MHC class‐I expression. Such changes may allow tumours to evade immune surveillance with more rapid progression. There was, however, no correlation with tumour type, degree of differentiation or stage of disease at presentation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Cancer Wiley

Loss of MHC class‐I expression in cervical carcinomas

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References (44)

Publisher
Wiley
Copyright
Copyright © 1990 Wiley‐Liss, Inc., A Wiley Company
ISSN
0020-7136
eISSN
1097-0215
DOI
10.1002/ijc.2910460614
Publisher site
See Article on Publisher Site

Abstract

The expression of MHC class‐I antigens was analysed in 67 cervical carcinoma biopsies; 16% of the biopsies showed complete or heterogeneous loss of HLA expression as judged by reactivity with antibodies recognizing monomorphic determi nants of the class‐I heavy chain bound to β2 microglobulin (β2m). In addition, other biopsies showed a loss in expression of particular allelic products: 23% for HLA‐A2; 17% for HLA‐A3; 23% for HLA‐Bw4 and 19% for HLA‐Bw6. Three biopsies showed changes at 2 alleles, 2 of which were at both HLA‐A and ‐B loci. Down‐regulation of class‐I expression may be virally mediated and HPV DNA is frequently found in cervical carcinomas. However, there appeared to be no direct correlation between the detection of HPV 16 or 18 DNA in these tumours and changes in HLA expression. There was also no correlation with the expression of the oncofoetal antigen 5T4. Our results show that a significant proportion (at least 30%) of the cervical carcinomas showed some alteration in MHC class‐I expression. Such changes may allow tumours to evade immune surveillance with more rapid progression. There was, however, no correlation with tumour type, degree of differentiation or stage of disease at presentation.

Journal

International Journal of CancerWiley

Published: Dec 15, 1990

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