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Table 2 Immunohistochemical expression of thymidylate synthase (TS) and topoisomerase I (Topo I) in tumor tissue samples (N = 498).

From: Topoisomerase I but not thymidylate synthase is associated with improved outcome in patients with resected colorectal cancer treated with irinotecan containing adjuvant chemotherapy

TS score N %  
0 157 32  
1 1 0.2 Negative/Low
2 47 9 expression
3 73 15  
4 105 21  
5 60 12 Positive/High
6 47 9 expression
Non Evaluable 8 2  
Topo I score    
0 170 34  
2 19 4 Negative/Low
3 54 11 expression
4 126 25  
5 80 16 Positive/High
6 32 6 expression
Non Evaluable 17 3  
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