AGTR1 and chronic graft versus host disease: In more detail, 3 out of 3 patients with cryptogenic organizing pneumonia (COP), 8 out of 9 patients with sclerodermatous chronic-GVHD, and only 3 out of 36 patients without scleroderma and/or COP were positive for the presence of AT1R-Abs (Figure 5a).