AGTR1 and graft versus host disease: More specifically, 5 out of 12 (42%) patients with chronic fibrotic GVHD were positive for the presence of high-titer AT1R-Abs, while only 1 out of 36 (1.8%) without fibrotic GVHD was positive for high-titer AT1R-Abs (p < 0.001).