PAS and CD31 detection in FFPE slides was conducted as previously described [54 (link),55 (link)]. The slides were first immunostained with CD31 (Abcam, Cambridge, UK, ab124432) as described above. After secondary antibody incubation, PAS staining was performed following the manufacturer’s recommendations (Sigma, St. Louis, MO, USA, 395B-1KT). Briefly, the slides were incubated for 5 min at room temperature with PAS, washed, and incubated for 15 min with Schiff’s Reagent. The slides were then counterstained with hematoxylin, dehydrated, and mounted.
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