Galandrini et al. [14] conducted a similar study using cytofluorometric analysis and reported an increased frequency of human leukocyte antigen–E inhibitory receptor CD94/NKG2A-expressing peritoneal NK cells in subjects with endometriosis (75.9% ± 8.2% vs. 52.1% ± 16.3%, p < 0.0001). Here, KLRD1 is linked to endometriosis.