The expression of Ki-67 was examined in 150 patients—52 benign postmenopausal endometrial polyps with no bleeding history, 19 endometrial carcinoma which had coexisting benign endometrial polyps, 12 endometrial polyps with foci of endometrial carcinoma and four patients with polyps who later developed endometrial carcinoma (the latter analysed as four postmenopausal endometrial polyps and four endometrial carcinoma cases), 31 atrophic endometria and 32 premenopausal benign endometrial polyps (Figure 1). This evidence concerns the gene MKI67 and endometrial polyp.