Effects of ovulation induction on ovarian morphology: an animal study.
OBJECTIVE
The aim of this study was to investigate whether the ovulation induction has relation with postneoplastic lesions.


METHODS
Seventy-eight female, 90-day-old rats were enrolled for the trial. They were divided into three groups. In the first group, 13 rats received one cycle of ovulation induction with Follitropin Beta and human chorionic gonadotropin. The second group of 13 rats received three cycles of ovulation induction, and the third study group consisted of 13 rats which received six cycles of ovulation induction. Each group had a control group consisting of same number of rats that had not received ovulation induction. At the 12th month after the ovulation induction protocols ended, rat ovaries were extirpated for histopathological examination. In histopathological examination, malignant lesions, ovarian cyst and cyst diameter, epithelial stratification, epithelial tufting, mitotic index, polymorphism of epithelial cells and nucleus, epithelial cell nuclear diameter, chromatin density nuclear atypia, and mitotic activity in ovarian cyst epithelium were evaluated.


RESULTS
No malignant ovarian lesion was found in the three groups. Ovarian cyst development was most frequent in the rats that underwent six cycles of ovulation induction. Epithelial stratification and tufting were most frequent in the rats which underwent ovulation induction six times. Significant difference was found between induction and control groups in second and third groups for cellular and nuclear polymorphism, presence of nucleolus, and nuclear chromatin density.


CONCLUSIONS
Although development of malignant lesion were not found in any of the rat ovaries after ovulation induction, increase in the prevalence of epithelial dysplasia especially with increase in the number of induction cycles shows that some ovarian pathologies can occur subsequent to ovulation induction.
Department of Obstetrics and Gynecology, Selcuk University Faculty of Meram Medicine, Konya, Turkey. celikcet@hotmail.com
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D000818:Animals; D002471:Cell Transformation, Neoplastic / Q000139:chemically induced / Q000473:pathology; D006063:Chorionic Gonadotropin / Q000009:adverse effects; D005260:Female; D037201:Follicle Stimulating Hormone, beta Subunit / Q000009:adverse effects; D010051:Ovarian Neoplasms / Q000139:chemically induced / Q000473:pathology*; D010053:Ovary / Q000187:drug effects / Q000473:pathology*; D010062:Ovulation Induction / Q000009:adverse effects*; D011230:Precancerous Conditions / Q000139:chemically induced / Q000473:pathology*; D051381:Rats
D006063:Chorionic Gonadotropin; D037201:Follicle Stimulating Hormone, beta Subunit