Our findings on the prognostic impact of protein expression of PDGFβR in the perivascular and stroma fraction of serous ovarian cancer with differentiation grade 2-3 prompted us to make some comparisons with analyses of PDGFRB gene expression in high-grade ovarian cancer in publicly available databases (see Supplementary Files). The gene discussed is PDGFRB; the disease is ovarian serous adenocarcinoma.