FAS and glioma: Staining of T98G glioma cells with Annexin V and propidium iodide (PI) indicated the average percentages of late apoptotic cells at 17%, 26%, 20%, and 51% in untreated, untreated with Fas mAb, decitabine-treated alone, and decitabine-treated with Fas mAb, respectively (Figure 6B).