GSTM1 and graft versus host disease: Ansari et al. [19] conducted a meticulous study using a multicenter cohort and proved the associations of GSTA1 and GSTM1 not only with CL and AUC, but also with clinical outcomes such as sinusoidal obstruction syndrome (SOS), graft-versus-host disease (GvHD) and hemorrhagic cystitis (HC).