Fig. 1

Correlations between cell-free DNA concentration at baseline and MRI characteristics. The cfDNA concentration is plotted against three tumor volumes: a T2-Flair; b T1-enhanced volume with necrosis; c T1 enhanced volume without necrosis (p = 0.018); and d rCBV (p = 0.03). rCBV had the highest association with cfDNA concentration. Gado: gadolinium; W/: with; W/O: without; rCBV: relative cerebral blood volume