immunolocalization has demonstrated that heterogeneity is present at the tumor , tissue , and cellular level within endometrial carcinomas , and the failure of some progesterone receptor-positive ( by biochemical assay ) tumors to respond to progestin therapy may reflect false positive results due to contamination of progesterone receptor-negative tumors by adjacent benign endometrium or myometrium .
C0476089
endometrial carcinomas
C0014180
endometrium