GLT1D1 and B-cell non-Hodgkin lymphoma: To test the cause–effect relationship between GLT1D1 expression and glycosylation of PD‐L1, we transfected B‐cell lymphoma lines (Raji and JVM2) with relatively high level of GLT1D1 with siRNA against GLT1D1 and then analyzed glycosylated PD‐L1.