PLOD1 and endometriosis: In this context, Ruth et al. showed that a SNP rs10835638 in the same region is associated with low FSH levels, longer menstrual cycles, later age at menopause, greater female nulliparity and lower risk of endometriosis [12]; and Bianco et al. demonstrated the effect of this locus on LH concentration in infertile women with endometriosis [13].