Ovarian cancer prognosis in women with endometriosis. A retrospective nationwide cohort study of 32,419 women.
Endometriosis is associated with ovarian cancer; the risk of developing ovarian cancer is put at between 5 and 10%. Often the cancer is of the subtypes endometrioid or clear cell cancer. These cancers present earlier and are commonly unilateral.
It was thought that women who develop ovarian cancer having previously been diagnosed with endometriosis had better survival rates. This study of the Dutch cancer population revealed 32,000 case of ovarian cancer, 6% had suffered from endometriosis prior to diagnosis.
Those women who had been endometriosis patients were younger and had more easily resected cancer on presentation. Even after allowing for the bias due to the more easily treated disease, having been diagnosed with endometriosis was protective, with survival being two times better than that of other patients who had not.
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