Comparative study between the concentration of interleukin-6 in peritoneal fluid and in serum of patients with endometriosis

ABSTRACT

Our purpose was to compare the level of interleukin- 6 in peritoneal fluid with that in serum in patients with and without endometriosis undergoing laparoscopic procedures and to set a value for Interleukin 6 as a marker for endometriosis in the serum and peritoneal fluid of patients diagnosed laparoscopically to have endometriosis and correlate it with the stage of the disease. The present study was conducted at the period starting from March 2002 to October 2003 in the laparoscopy unit, Ain Shams University Maternity hospital. Fifty patients underwent laparoscopy were recruited in this case control cross-sectional study. These patients were divided into two groups. Group I included thirty patients diagnosed to have endometriotic lesions by means of laparoscopy and histopathologic confirmation. Group II included twenty patients diagnosed laparoscopically to have no visible gynecological lesions [e.g. women undergoing laparoscopic tubal ligation]. These patients were subjected to full history taking with special regard to symptoms suggestive of endometriosis, full general, abdominal and local examination for signs of endometriosis, laparoscopic visualization and staging of endometriosis according to the criteria of the revised American Fertility Society classification system, testing for serum and peritoneal fluid Interleukin-6 using the BioSource International ELISA. [Enzyme linked immunosorbent assay], and histopathologic confirmation of peritoneal endometriotic lesions. Interleukin- 6 was significantly higher among female patients diagnosed to have endometriosis than in control patients both in serum and peritoneal fluid. Also, our study revealed a highly significant direct correlation between the level of serum and peritoneal fluid IL-6 among women with endometriosis. A significant direct correlation between the level of IL-6 with the grade of endometriosis among cases was found both in serum and peritoneal fluid IL-6. However, no significant correlation was found between the grade of endometriosis and pain among the cases group. Increased peritoneal fluid levels of interleukin-6 in patients with active red endometriosis may relate to endometriosis-associated infertility and to the pathogenesis of endometriosis