Rh negative women are twice as likely to develop endometriosis

In addition to our post about AB negative women being more likely to develop endometriosis in Armenia, other studies support the higher risk to develop this cancer for rhesus negatives.

A French study of 633 patients concluded that Rh-negative women are twice as likely to develop endometriosis.

In conclusion, Rhesus negativity could represent a risk factor for endometriosis in a Caucasian population. Biologic rationale for this association is consistent and could lead to the improvement of our knowledge of endometriosis pathogenesis. This observation could also contribute to shortening the time to diagnosis as being part of a more global score to predict the risk of endometriosis, which would include other known risk factors.

Source: ABO and Rhesus Blood Groups and Risk of Endometriosis in a French Caucasian Population of 633 Patients Living in the Same Geographic Area

https://www.ncbi.nlm.nih.gov/pubmed/25243164