Comparative immunohistochemistry between GCs of large follicular structures in bOE (n = 23, Figure 5A,D) and neoplastic GCs of cyst-like structures in GCT-uOE (n = 10, Figure 5B,C) revealed a statistically significant higher Ki67 PI (p = 0.02) in bOE (median 51.0%, IQR 52.0) compared with GCT-uOE (median 4.5%, IQR 27.3%). The gene discussed is MKI67; the disease is cyst.