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Table 2 Association between tumour characteristics and ctDNA positivity

From: Circulating tumour DNA for monitoring colorectal cancer—a prospective cohort study to assess relationship to tissue methylation, cancer characteristics and surgical resection

Factor Odds ratio (95% CI) P value
Stage   < 0.001
 I 1 (reference)  
 II 12.5 (4.3–36.6)  
 III 16.6 (5.7–48)  
 IV 92.1 (16.5–513.8)  
Location   0.004
 Proximal colon 1 (reference)  
 Distal colon and rectum 3.0 (1.4–6.2)