Fig. 2From: Association of emergence of new mutations in circulating tumuor DNA during chemotherapy with clinical outcome in metastatic colorectal cancerCorrelations between baseline mTBI and CEA level and PFS. a Negative correlation between the baseline mTBI level and PFS was seen: Spearman correlation at P = 0.0083, r = − 0.5725. b No correlation between the baseline serum CEA level and PFS was observed: Spearman correlation at P = 0.2928, r = − 0.2475Back to article page