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Tumor expression levels of excision repair cross-complementing gene-1 (ERCC1) and thymidylate synthase (TS) were evaluated using immunohistochemistry. Representative images are depicted (original magnification ×400). (a) Low ERCC1 expression was observed in 84 patients (77%), (b) high ERCC1 expression was observed 25 patients (23%), (c) low TS expression was observed in 61 patients (57%), and (d) high TS expression was observed in 48 patients (43%).
