PDGFRA and benign neoplasm: Differential expression was also observed between LMP tumors and benign tumors/normal ovaries for three out of five genes examined (PDGFRA, SLPI, WNT7A) and between invasive and LMP tumors for the other two genes (C6orf31, GLTSCR2) (Kruskal Wallis p < 0.05).