They found that a subset of proteins overexpressed in ovarian cancer tissue were present in the exosomal protein list, including epithelial cell surface antigen (EpCAM), proliferation cell nuclear antigen (PCNA), tubulin beta-3 chain (TUBB3), epidermal growth factor receptor (EGFR), apolipoprotein E (APOE), claudin 3 (CLDN3), fatty acid synthase (FASN), ERBB2, and L1CAM (CD171). Here, PCNA is linked to ovarian carcinoma.