Serum CA125 changes in one case with malignant transformation from benign endometriosis to Müllerian adenosarcoma

To the editor:We here present a rare case of müllerian adenosarcoma arising in pelvic endometriosis and the changes of serum CA125 level during the course of malignant changes.Serum CA125 was found being persistently abnormal during the course of endometriosis progression;and the fluctuation of CA125 seemed be relative to disease condition and could reflect the response to treatment.