TNFRSF1A and acute graft versus host disease: Recent studies show several plasma biomarkers that correlate with acute GVHD: suppression of tumorigenicity 2 (ST2) [3,4], interleukin (IL)-2 receptor α [5], tumor necrosis factor receptor 1 (TNFR1) [5], hepatocyte growth factor [5], IL-8 [5], and IL-6 [6] for systemic GVHD; elafin for skin GVHD [7]; and regenerating islet-derived 3-α [8] and T-cell immunoglobulin mucin-3 for gastrointestinal GVHD [8,9,10,11,12].