IL1B and endometriosis: Since the SNPs identified in the earlier GWAS reports of endometriosis and dysmenorrhea are in LD with and appear to represent the same signal as those in our current study, our analysis of epigenetic functionality and eQTLs provides insight into the genetic relationship between dysmenorrhea and the development of endometriosis in terms of linked SNPs and gene expression in the IL1 gene region.