Receiver operating characteristic (ROC) curve analysis showed that AT1R-Abs titers above 9.2 IU/mL had 89% sensitivity and 92% specificity for the diagnosis of either chronic sclerodermatous GVHD or COP after allo-SCT (AUC = 0.932, 95% CI, 0.822–0.933, p < 0.001), (Figure 5b). This evidence concerns the gene AGTR1 and cryptogenic organizing pneumonia.