WT1 and neoplasm: In serous OC, patients with both high-WT1 IgG Ab level and WT1-positive staining survival did not differ in PFS compared with others (P = 0.264, Fig.5B), whereas significant poor PFS was found in subgroups with nonserous subtype (P = 0.039, Fig.5C) and tumor grade 3 (P = 0.039, Fig.5D).