PTEN and Endometrial Cyst: In a study of 19 OEAs, 22 OCCAs, and 23 solitary endometrial cysts, LOH at 10q23.3 (the gene locus of PTEN) occurred in 42.1% (8 of 19) OEAs, 27.3% (6 of 22) OCCAs, and 56.5% (13 of 23) solitary endometrial cysts.