Compared to pre-induction controls the median (range) %CD56+ cells (1.1% (0.8–3.0) n = 5; KW test, P = 0.17, Fig. 3) was not statistically significantly different at 3 months (2.0% (1.3–2.5) n = 8) and 15 months (1.8% (0.8–3.4) n = 8) in the eutopic endometrium post-induction of endometriosis although the median levels were slightly higher. This evidence concerns the gene NCAM1 and endometriosis.