In one study [51], expression of the endothelial constitutive isoform of nitric oxide synthase (ecNOS) was investigated in 50 endometrial carcinomas (42 endometrioid, 4 serous papillary, 2 clear cell, and 2 adenosquamous carcinomas) and 21 normal endometrial gland tissue specimens. The gene discussed is NOS3; the disease is endometrial carcinoma.