FASLG and glioma: FasL expression in the primary human glioma cells resulted in approximately 30 % cell death (Figure 2B) in pG8-FasL-infected cells in comparison to those infected with the pG8-18 amplicon vector, which was further confirmed in the TUNEL staining whereby only pG8-FasL-infected cells (eGFP+) were TUNEL positive (Figure 2C).