Interestingly, in 2016, Ahn et al. first reported that the mRNA expression level of carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) was significantly decreased in ectopic lesions of EMs patients compared to control endometrial tissue from patients without EMs [53]. This evidence concerns the gene CEACAM1 and eosinophilia-myalgia syndrome.