CEA staining was absent in mesenchymal, lymphatic, and hematopoietic cells; skin; liver; adrenal gland; kidney; gall bladder epithelium; Brunner glands; prostate; seminal vesicle; epididymis; testis; breast; placenta; endocervix; endometrium; ovary with corpus luteum and follicular cysts; thyroid; hypophysis; cerebrum; and in the cerebellum (Supplementary Table S1). This evidence concerns the gene CEACAM5 and Follicular Cyst.