Furthermore, in ectopic endometrium expression and localization of MT1-MMP and MMP2 in ectopic endometrium was found to be only increased in the secretory but not in the proliferative phase compared to eutopic endometrium [25], whereas Londero et al. [26] reported an increased MT1-MMP and MMP2 protein presence in endometriosis compared to eutopic endometrium. Here, MMP2 is linked to endometriosis.