The status of EBV infection was assessed by ISH detection for EBER on paraffin-embedded tissue sections using fluorescein-labeled oligonucleotide probes (INFROM EBER Probe, Ventana), as previously described [11 (link)]. The visualization system used was the BenchMark XT with enzymatic digestion (ISH Protease 2, Ventana) and the iVIEW Blue v3 Detection Kit (Ventana). A known EBV-positive tumor was used as a positive control in each run. An appropriate negative control section was also included.
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