MKI67 and adenosarcoma: A few studies examining the immunohistochemical features of adenosarcoma have found that the stromal component stains similarly to LGESS (positive for ER, PR, WT-1, and CD10), and that SO is associated with a decrease in ER, PR, and CD10 expression as well as a higher Ki-67 proliferation index and increased expression of p53 (6, 17, 27–31).