IL11 and neoplasm: IL11 immunostaining was significantly higher in epithelial tumour cells from Grades 1 and 3 but not Grade 2 tissue compared to endometrial epithelial cells from proliferative phase women (p < 0.05 in G1 and p < 0.001 in G3, Fig 1A) but was higher only in Grade 1 compared to postmenopausal women.