To validate these findings, we performed mIHC analysis of FFPE (formalin-fixed paraffin-embedded) tissues from our retrospective OC cohort (n = 11) using a cocktail of antibodies to define specific cell types: PDGFRβ, fibroblast marker; FAP, cancer-associated fibroblasts (CAFs) marker; E-cadherin, epithelial cancer cell marker, combined with ROR1 and phospho-STAT3 (pSTAT3) Tyr705 staining. Here, STAT3 is linked to cancer.