FAS and endometriosis: The authors suggest that a complete genetic analysis of the genes involved in the intricate regulatory system of the apoptosis may lead to the identification of susceptibility factors for the disease and a better understanding of its etiology.27 In spite of showing an absence of association between FAS polymorphisms and endometriosis, Fernández et al27 reported that this does not allow us to completely exclude these genes as potential candidates for the disease.