Clinical course. Clinical course by EBV PCR titer, detailed with key events including timing of rituximab, CTLs, and blinatumomab. EBV, Epstein-Barr Virus; IR, interventional radiology; IU/mL, international units per milliliter; LP, lumbar puncture; PCR, polymerase chain reaction; PET, positron emission technology; PTLD, posttransplant lymphoproliferative disease.