Also, as the heart of animals killed by thisway works much later, more blood and other materials,including hormones, will be removed from the animals(36); this could possibly be corroborated by other studiesin which indicated an association between heme ironintake and endometriosis risk (7) and also reported lowerconcentrations of hemopexin, which is the major vehiclefor the transportation of heme iron (37).In the present study, we found no association betweenthe consumption of fish and endometriosis risk. This evidence concerns the gene HPX and endometriosis.