Article (Scientific journals)
Role of methalothionein in irradiated human rectal carcinoma.
Bouzourene, H; Chabert, P; Gebhardt, S et al.
2002In Cancer, 95 (5), p. 1003-1008
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Keywords :
metallothionein; rectum; cancer; radiotherapy; in vitro
Abstract :
[en] BACKGROUND. Metallothioneins (MT) are low-molecular weight, metal-binding proteins that play a role in cellular proliferation and differentiation, as well as in cellular defense mechanisms. They act as scavengers of free radicals produced by irradiation. A number of in vitro and in vivo studies have linked overexpression of cellular MT with tumor cell resistance to radiation. This is the first study that investigates whether MT expression is involved in the radioresistance of rectal carcinoma. METHODS. Using a mouse monoclonal antibody, MT expression was analyzed by immunohistochemistry on surgical samples (n 85) from 85 patients with locally advanced rectal carcinoma who were treated preoperatively with a hyperfractionated and accelerated radiotherapy schedule and on tumor biopsies (n 13) obtained before treatment. The potential correlations between MT expression and pathologic variables and survival were examined. RESULTS. MT were expressed strongly in both the cytoplasm and nucleus of tumor cells in 7 biopsy and 42 surgical samples. A comparison of MT expression in biopsy and surgical specimens showed that MT expression did not change after irradiation in most cases. Against all expectations, MT were expressed more frequently in tumors from responders than in those from the nonresponders (P 0.02). There was no correlation between MT expression and tumor stage, histology after radiotherapy, or survival. CONCLUSION. These findings do not support the hypothesis that MT overexpression at the end of radiotherapy is a marker for radiation resistance. Cancer 2002;95: 1003–8. © 2002 American Cancer Society. DOI 10.1002/cncr.10780
Disciplines :
Oncology
Hematology
Author, co-author :
Bouzourene, H;  Lausanne
Chabert, P;  Lausanne
Gebhardt, S;  Lausanne
Bosman, F-T;  Lausanne
COUCKE, Philippe  ;  Centre Hospitalier Universitaire Lausanne > Radiothérapie
Language :
English
Title :
Role of methalothionein in irradiated human rectal carcinoma.
Publication date :
2002
Journal title :
Cancer
ISSN :
0008-543X
eISSN :
1097-0142
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
95
Issue :
5
Pages :
1003-1008
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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