CD8A and endometriosis: Immunohistochemical validation of their transcriptomic data confirmed increased proportions of CD8+ cells among all leukocytes in the eutopic endometrium of endometriosis patients versus controls in both the proliferative and early secretory phases (0.2292 ± 0.0591 vs 0.1790 ± 0.0562, p = 0.0132, AUC = 0.727) (28).