Three of five genes that we identified as associated with disease recurrence (CD24, C1S and THBS1) were also found to be prognostic in a recent study by Tan and colleagues, which identified two prognostic OCCC gene expression subtypes in a large cohort of OCCCs [24], and may thus represent useful biomarkers for identification of poor prognosis OCCC tumours. This evidence concerns the gene C1S and neoplasm.