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Korean Journal of Obstetrics & Gynecology 2005;48(9):2172-2180.
Published online September 1, 2005.
Clinical application of serum CA 125 and CA 19-9 in Endometriosis.
Kyong Wook Yi, Il Hae Park, Min Koo Yeo, Seung Hun Song, Jae Kwan Lee, Min Jung Oh, Ho Suk Saw, Yong Kyun Park, Jun Yong Hur
Department of Obstetrics and Gynecology, College of Medicine, Korea University, Seoul, Korea. himuro95@hanmail.net
Abstract
OBJECTIVE
The aim of the present study was to investigate the clinical usefulness of serum CA 125 and CA 19-9 levels for diagnosing and determining the severity of endometriosis. METHODS: A total of 112 women who underwent gynecologic surgery between January 1998 and August 2004 were selected in this study. 81 patients had histologically confirmed endometriosis and the remaining 31 had benign ovarian tumor but no obvious evidence of endometriosis. Blood samples were collected in all patients before the operation and the mean values and standard deviations of both serum CA 125 and CA 19-9 levels were measured in various stages of disease. Both tumor markers were also measured in the control group. The results were compared to determine the usefulness of CA 125 and CA 19-9 in diagnosing and predicting the severity of endometriosis. As a results, new cutoff values of serum CA 125 and CA 19-9 in endometriosis were obtained. RESULTS: The mean levels of serum CA 125 and CA 19-9 in patients at stage III and IV of endometriosis were significantly higher than in patients without endometriosis, and increased in accordance with the advancement of the clinical stage. Statistically appropriate cutoff values of CA 125 and CA 19-9 were calculated to be 20 IU/mL and 10 IU/mL, respectively. The sensitivity and specificity of CA 125 at this cutoff value for endometriosis were 72% and 71%, respectively. The sensitivity and specificity were 59% and 55% respectively in the case of CA 19-9. CONCLUSION: CA 125 is a useful marker for diagnosing and determining the severity of endometriosis. CA 19-9 shows limitation in diagnosing endometriosis, but is indeed a potential marker in predicting the severity of disease.
Key Words: Endometriosis, CA 125, CA 19-9


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