IGF1R and endometriosis: Previous studies have revealed that, compared to normal controls, eutopic endometria from infertile women with endometriosis present aberrant molecular expression, such as decreased expression of lncRNA H19, which might regulate the H19/Let-7/IGF1R pathway contributing to impaired endometrium receptivity for pregnancy in women with endometriosis (Ghazal et al., 2015).