A. ELISA for ephrinB2 in patient plasma samples collected from patients with LAPC, prior to, during, and after treatment with SBRT. X axis shows dose per fraction of SBRT, patients were treated with 3 fractions. Y axis represents ephrinB2 plasma concentration determined by standard curve. *p<0.05 B. ELISA for ephrinB2 in mouse plasma collected 2 weeks following increasing single fraction doses of RT to flank grafts, Y axis represents absorbance at 450nm minus negative control. N=6 replicates. C. ELISA for ephrinB2 in mice implanted with WT KPC flank grafts, vs. ADAM10 KO KPC grafts, Y axis represents absorbance at 450nm minus negative control N=6 replicates. P values calculated using Student’s T-Test.