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Correlation between quantity of circulating tumor DNA and other measurements. (a) Correlation between quantity of circulating tumor DNA and 3D measured tumor volume (n = 47). Total group: Spearman's ρ = 0.544, p < 0.001. Subgroup with detectable ctDNA: Spearman's ρ = 0.781, p < 0.001. (b) Correlation between quantity of circulating tumor DNA and CA19.9 (n = 49). Total group: Spearman's ρ = 0.199, p = 0.170. Subgroup with detectable ctDNA: Spearman's ρ = −1.20, p = 0.616.
