Efficacy of danazol treatment in infertile patients with endometriosis

The study was done to assess the efficacy of danazol in the treatment of infertile patients with all stages of endometriosis. The cumulative pregnancy rates in 21 patients with Stage I and II endometriosis were compared to 21 patients with Stage III and IV endometriosis. Both groups had danazol treatment for six months. All other fertility related factors were controlled for in both groups. There was a cumulative pregnancy rate of 11% (standard error 7%) at 12 months of follow-up in the group with Stage I and II disease whilst it was 26% (standard error 10%) in the group with moderate or severe disease. These results question the validity of any classification system in prognosticating for fertility in patients with endometriosis.