There were 1688 citations for “Glypican-1 identifies cancer exosomes and detects early pancreatic cancer” (27), followed by “Systemically Injected Exosomes Targeted to EGFR Deliver Antitumor MicroRNA to Breast Cancer Cells” (28), with 1049 citations, and “A doxorubicin delivery platform using engineered natural membrane vesicle exosomes for targeted tumor therapy” (29), with 1047 citations. The gene discussed is GPC1; the disease is breast cancer.