How Can "No Specific Molecular Profile" Heterogeneity be Reduced in Molecularly Classified Endometrial Cancer?: Prognostic Significance of L1 Cell Adhesion Molecule.

This study aims to investigate the role of L1 cell adhesion molecule (L1CAM) in the prognostic assessment of endometrial cancers that have been depicted as having no specific molecular profile (NSMP) in molecular classification. This is a retrospective review of 150 patients who received the diagnosis of endometrial cancer and underwent surgery at the study center between January 2008 and January 2022. When evaluating L1CAM immunohistochemical staining, scoring was done according to the percentage of positivity in tumor cells. Accordingly, score 0 = 0%, score 1=1% to 10%, score 2 = >10% to 50% and score 3 = >50%. If the staining in tumor cells was ≥10% (scores 2 and 3), it was considered positive. The patients with L1CAM positivity had significantly more frequent lymphovascular space invasion and lymph node metastasis than patients with L1CAM negativity (P = 0.013 and P = 0.007). L1CAM expression was strongly associated with mutant p53 (P = 0.003). Recurrence was significantly higher (P = 0.001) and overall survival and progression-free survival were significantly lower in patients with L1CAM positivity (P = 0.001 for both). Seventy-nine patients (52.7%) were put into NSMP group. About 84.8% of them (n = 67) were L1CAM negative and 15.2% of them (n = 12) were L1CAM-positive. Recurrence was significantly higher (P = 0.001) and overall survival and progression-free survival were significantly lower in patients with NSMP who were positive for L1CAM (P = 0.002 and P = 0.001, respectively). This study demonstrates that L1CAM expression status may add prognostic information to endometrial cancer, particularly in the NSMP subgroup. Considering the prognostic importance of L1CAM, its use as a marker may make significant contributions to reducing prognostic heterogeneity, especially in the NSMP subgroup.

Effect of hemoglobin, albumin, lymphocyte, and platelet score on prognosis in intermediate-risk endometrial cancer according to molecular-based classification.

OBJECTIVE: The aim of this study is to compare the relationship between molecular classification and HALP score in endometrial cancer (EC). METHODS: Patients who were operated with the diagnosis of EC 2014 and 2024 were included in our study. 150 patients were included in the study. We divided the patients into three groups in terms of molecular classification; group 1 was the patients with POLE mutation, group 2 was the patients with MMRd and NSMP (intermediate prognosis), and group 3 was the patients with p53 mutation. Group 2 participants were divided into two groups, a low HALP score group and a high HALP score group, according to the HALP score cut-off value. RESULTS: Using the value with the highest Youden's index (0.306) as a basis, it was demonstrated that the HALP score with a cut-off value of 33.735 has a sensitivity of 61.86% and a specificity of 68.75% in intermediate-risk EC. The 5-year overall survival (OS) was found to be 75.4% in intermediate-risk EC patients with low HALP scores and 91.5% in intermediate-risk EC patients with high HALP scores (p = 0.008). The 5-year progression-free survival (PFS) was found to be 86% in intermediate-risk EC patients with low HALP scores and 94.4% in intermediate-risk EC patients with high HALP scores (p = 0.089). MMR deficiency and NSMP have been considered intermediate-risk groups for endometrial cancer and are a heterogeneous group. Although the use of the HALP score to reduce this heterogeneity is successful in predicting OS, it is not sufficient for PFS.

Relationship between molecular markers and lymphadenectomy and lymphovascular space invasion in endometrial cancer.

PURPOSE: Relationship between pathologic parameters, surgical parameters, or lymph node status with oncologic outcomes is not fully elucidated in endometrial cancer (EC). We want to investigate the molecular classification of uterine cancer in the Turkish population and its relationship between lymphadenectomy and lymph node metastasis. METHODS: In this study, 100 patients' clinical and pathologic data diagnosed with EC were analyzed. Pathologic and molecular parameters were investigated and compared them with clinical parameters. RESULTS: According to the molecular analysis, 16 patients (16%) had p53 mutation, 3 patients (3%) were classified as POLE mutant group, 38 (38%) patients in the MSI group, and the remaining 43 patients (43%) into the no specific mutation profile (NSMP) group. Lymph node metastasis rate was significantly higher in copy number high (CNH) group compared to the others. In the CNH group, 29 of 437 (6.6%) dissected lymph nodes had metastasis. The median OS was the highest in the POLE group (72 months) and lowest in the CNH group (36 months). CONCLUSION: Endometrial cancer patients showed significantly different overall and disease-free survival according to the molecular subtypes and it was consistent with the literature, Lymph node metastasis risk was the highest in CNH group. MSI status is important for the lymph node metastasis risk but not all abnormalities, especially PMS2 and MLH1 expression changes showed the highest risk.

Two-Year Follow-Up Results of Transobturator Tape Procedure with and without Concomitant Vaginal Surgery.

OBJECTIVE: This study aims to evaluate the subjective and objective outcomes of the transobturator tape (TOT) procedure performed to treat stress urinary incontinence and to determine the efficacy and safety of the TOT procedure when used along with vaginal surgery. METHODS: This is a prospective review of 24 women who had the TOT procedure done only due to stress incontinence; 22 women who underwent concomitant TOT and pelvic floor repair; and 20 women who received concurrent TOT, transvaginal hysterectomy, and sacrospinous ligament fixation. RESULTS: When compared to the patients who had TOT with pelvic floor repair, the patients who underwent TOT with hysterectomy declared to have more dyspareunia (p = 0.008) and they were found to have significantly higher post-void residual volume (p = 0.014). When compared to the patients who had only TOT, the patients who underwent TOT with hysterectomy claimed to have more pelvic pain (p = 0.012) and significantly higher post-void residual volume (p = 0.020). CONCLUSION: The TOT procedure results in moderately high objective cure rates, and concurrent application of pelvic floor repair or transvaginal hysterectomy does not affect these rates. The relatively higher incidences for voiding problems and pelvic pain in women who underwent TOT, hysterectomy, and sacropinous fixation simultaneously suggest that the extent of surgery directly correlates with the severity of postoperative complications.

Plasma L-carnitine levels of obese and non-obese polycystic ovary syndrome patients.

It is well-known that plasma L-carnitine concentrations are significantly decreased in obese individuals. A study showed that L-carnitine concentrations are significantly lower in lean PCOS patients than in lean healthy women. Thus, it has been suggested that lowered L-carnitine is associated with PCOS. This study also showed that the women with PCOS had significantly lower L-carnitine levels than those of the healthy controls. In addition, this study hypothesised that low L-carnitine levels in PCOS patients were associated with obesity and/or insulin resistance. Moreover, plasma L-carnitine concentrations were found to be statistically similar in PCOS patients and healthy controls, when controlled for obesity. This study implied that L-carnitine could be used as an adjunctive therapy in the management of insulin resistance or obesity in women who have PCOS. Further research might be planned to clarify the clinical effects of L-carnitine administration in PCOS patients with insulin resistance and/or obesity.

Recurrent uterine leiomyosarcoma: an atypical location.

Leiomyosarcoma (LMS) is a malignant tumor of smooth muscle cells and comprises 5-24% of all soft tissue sarcomas. Although the most frequent symptoms are vaginal bleeding and abdominal pain, the symptoms are generally associated with dimensions and localization of the tumor. The current study presents a case of uterine leiomyosarcoma that metastasized to the rectus abdominis muscle, which has only been previously reported in two cases in the literature. A 57-year-old multigravid patient presented with a palpable mass in her abdomen. The patient's past medical history revealed a hysterectomy performed in another center seven years ago with a postoperative histopathological report of leiomyosarcoma. A myomatous mass was detected, which was localized at the distal part of the right rectus muscle during operation. The mass was completely excised. The case was diagnosed as leiomyosarcoma according to the histopathological findings. Any mass in a skeletal muscle should be suspected to be metastasis in patients with a prior history of aggressive gynecologic malignancy such as LMS.

L-Carnitine: a new insight into the pathogenesis of endometrial cancer.

OBJECTIVES: The present study aims to specify the role of L-carnitine in the pathogenesis of endometrial cancer by comparing the serum total L-carnitine levels of endometrial cancer patients with those of healthy women. METHODS: Serum total L-carnitine concentrations were measured in patients with endometrioid-type endometrial cancer (n = 20) and healthy controls (n = 20) who were matched with respect to age and body mass index (BMI). RESULTS: Stage I endometrial cancer was diagnosed in 12 women (60.0%) whereas three women (15.0%) had stage II disease, three women (15.0%) had stage III disease and two women (10.0%) had stage IV disease. The healthy controls and endometrial cancer patients were statistically similar in aspect of age, gravidity, parity, BMI, waist-to-thigh ratio, waist-to-hip ratio, menopause, complete blood count parameters, and serum biochemistry. Serum total L-carnitine levels of women with endometrial cancer were significantly lower than those of healthy women (respectively, 5,519.4 ± 2,712.5 vs 7,940.8 ± 3,566.6 ng/dl, p = 0.021). Moreover, serum total L-carnitine levels decreased significantly and progressively with advancing stage (stage I vs II vs III vs IV; 6,294.0 ± 2,885.1 vs 5,800.0 ± 441.2 vs 4,016.0 ± 2,833.3 vs 2,560.0 ± 67.9 ng/dl; p = 0.021). CONCLUSIONS: This is the first study to hypothesize that L-carnitine deficiency participates in the pathogenesis of endometrial cancer by means of a mechanism which is unrelated with obesity and increased amount of fat in human body.

The Role of Lymphovascular Space Invasion and Cytology in the Prognosis of Endometrial Cancer.

BACKGROUND: Lymphovascular space invasion (LVSI) and cytology are both independent and strong prognostic factors in endometrial cancer. This study aims to highlight the impact of LVSI and cytology positivity on prognosis, in addition to molecular classification. METHODS: A retrospective review was conducted on the records of 223 patients with endometrial cancer diagnosed between January 2011 and January 2021. The inclusion criteria stipulated that the patients were diagnosed with endometrial cancer by endometrial biopsy and were operated in the clinic. The exclusion criteria included sarcoma in the postoperative pathology report results or synchronous tumor. Staging was performed according to the Fédération internationale de gynécologie et d'obstétrique (FIGO) 2009 criteria. Cytology (using 50 cc saline) was obtained upon entry into the peritoneal cavity. In 20 patients, saline was not used due to the presence of ascites in the abdomen. The Kaplan-Meier method was employed to evaluate overall survival and progression-free survival. Survival rates were compared in terms of cytology and LVSI. RESULTS: After analyzing the postoperative pathology results, it was found that the mean tumor size was 4.03 ± 2.3 cm. The most common histological type was endometrioid carcinoma, with stage IA being the most common stage. Out of 223 patients with endometrial cancer, the overall survival rate was 82.4%, and the progression-free survival rate was 88.3%. For patients negative for LVSI, the progression-free survival rate was 93%, while for LVSI-positive patients, it was 77.3% (p < 0.001). Additionally, the progression-free survival rate for patients negative for cytology was 90.4%, whereas for cytology-positive patients, it was 77.1% (p < 0.05). CONCLUSIONS: In our study, we observed that LVSI positivity and cytology positivity also reduced the overall survival rate. We aimed to highlight that, in addition to molecular classification, cytology positivity and LVSI positivity are still highly significant and independent factors in prognosis.

Very rare cause of vaginal mass in pregnancy: cavernous hemangioma.

Vaginal cavernous hemangioma is a considerably rare condition during pregnancy. There has only been one reported case to date. A multiparous, 24-year-old woman in the 32nd week of pregnancy was admitted with a mass prolapsed from the vagina, which had suddenly increased in size over the previous few days. A necrotic mass obstructing the vaginal canal and originating from the posterior wall was observed in a pelvic physical examination and carefully excised. The patient had contractions after the intervention and was administered tocolytic treatment with bed-rest and fluids. Her obstetric clinical status was stable after treatment and she gave birth without complication at 37 weeks and 5 days from the vaginal canal. The main approach to these very rare tumors of pregnancy, especially in the presence of necrosis, infection and/or obstruction, should be excision. But the potential for increased blood loss that may occur due to the hypervascular structure of the tumor should be taken into account.

Efficacy of transcutaneous electrical nerve stimulation for pain relief in women undergoing office endometrial biopsy.

AIM: To evaluate the efficacy of transcutaneous electrical nerve stimulation (TENS) for decreasing pain related with office endometrial biopsy. METHODS: In this prospective study, 65 women undergoing office endometrial biopsy were randomly allocated to receive 550 mg oral naproxen sodium plus active TENS (Group I, n = 33) or 550 mg oral naproxen sodium plus placebo TENS (Group II, n = 32). The intensity of pain perceived by the patients was measured using a 10-cm visual analog scale (VAS) before insertion of the speculum, when the cervix grasped, immediately after biopsy, and 15 min after the procedure. The effect of anxiety (Spielberger's state anxiety inventory) on pain scores was also investigated. RESULTS: There were no statistical significant differences between groups in age, weight, body mass index, gravidity, parity, education, and menopausal status (p > 0.05). The pain scores before insertion of the speculum, when the cervix grasped, and immediately after biopsy were similar in both groups (p > 0.05). But at 15 min after the procedure, there was a significant reduction of the mean VAS pain score in naproxen sodium plus TENS group, compared with the naproxen sodium plus placebo TENS group (0.14 ± 0.47, 1.44 ± 1.37, respectively, p < 0.0001). The mean anxiety scores were 48.19 ± 6.71 and 45.85 ± 6.22 in Group I and Group II, respectively. We did not find any significant correlation between anxiety and VAS pain scores (p > 0.05). CONCLUSIONS: TENS appears to be successful in decreasing pain only after the procedure undergoing office endometrial biopsy. It can be used as a simple, cheap, safe, and effective pain relief method.

Prognostic value of systemic inflammation response index in patients with persistent human papilloma virus infection.

OBJECTIVES: Persistent human papilloma virus (HPV) infection is a risk factor for the progression of cervical neoplasia into invasive carcinoma. Many inflammatory markers obtaining from hemogram parameters as platelets, monocytes, lymphocytes, and neutrophils or their ratios are still under investigation in recent decades, especially in the oncology era. Indeed, there have not been enough data about the relationship between these parameters and cervical cancer in the literature. Our primary aim was to investigate the possible relationship between the persistent HPV, which is one of the significant risk factors of cervical cancer, and these inflammatory markers. Further, we can add an easy follow-up parameter in women with persistent HPV infection. MATERIAL AND METHODS: The study included patients between 30-65 years old, tested positive for HPV, and afterward had an HPV control test between January 2015 and June 2020. RESULTS: The study included 114 HPV DNA-positive patients. The mean age was 43 (standard deviation 8.7), and 41 of them (36%) had persistent HPV, but the remaining 73 (64%) did not. The baseline neutrophil/lymphocyte ratio (NLR) value was 2.1, platelet/lymphocyte ratio (PLR) was 133, monocyte/lymphocyte ratio (MLR) was 0.28, and systemic inflammation response index (SIRI) was 0.9. All the parameters were significantly higher in the persistent HPV group compared to the non-persistent group. Patients who had 0.65 and under this had a significantly lower risk of persistent HPV. CONCLUSIONS: Persistent HPV disease can be predicted with an elevated SIRI, NLR, and other hematologic parameters. So, we can closely follow up with these patients with different algorithms to prevent cervical cancer.

Maternal and fetal leptin and ghrelin levels: relationship with fetal growth.

PURPOSE: In our study, we investigated the influence of plasma levels ghrelin, leptin and other metabolic hormones (ILGF-1 and ILGF-2) in pregnants in regulating fetal body weight and mode of delivery. METHODS: A total of 36 appropriately healthy pregnants 19-36-year-old were involved in the study. Demographic characteristics, serum ghrelin, leptin, IGF-1 and IGF-2 levels of the pregnants were studied. RESULTS: Plasma ghrelin and leptin levels did not differ significantly among trimesters and delivery, in contrast to IGF-I and IGF-II concentrations were significantly higher in the first half of the pregnancy (P < 0.05). Serum leptin was significantly associated with mode of delivery (r = 0.231; P = 0.008), BMI (r = 0.462; P = 0.004). CONCLUSION: Metabolic factors are associated with fetal growth, but in AGA babies, there were no differences between any parameter and clinical factor.

Clinical implication of preoperative psoas muscle area in endometrial cancer patients.

OBJECTIVE: Obesity is a significant risk factor for endometrial cancer. In contrast, sarcopenia describes a loss of the body's muscle mass that is closely related to unfavorable clinical outcomes. Even endometrial cancer patients have high rates of obesity, and they should have a significantly higher risk for undiagnosed sarcopenia or fragile muscle quality. METHODS: This is a retrospective study that included an endometrial cancer database collected from a tertiary gynecologic cancer center. We investigated the relationship between preoperative psoas muscle area by magnetic resonance imaging, surgical outcomes and pathological features. RESULTS: The study included 116 patients, the mean height was 160 cm (Standart deviation 7), weight was 72 kg (Standart deviation 18), and the median duration of hospitalization was 4 days (Interquartile range 2-9) in the whole study group. Sarcopenia was diagnosed in 25 (21.6%) patients, according to the magnetic resonance imaging findings. Three (6.5%) obese patients had sarcopenia, but it was 31.4% in nonobese patients (p=0.026). The median duration of hospitalization was five days (3-9 days) in the sarcopenia group, and it was four days (2-7 days) in the non-sarcopenia group. CONCLUSION: Sarcopenic patients did not have increased surgical complication rates following uterine cancer surgery. We should be aware of hospitalization duration in those patients, and sarcopenic counterparts necessitate longer follow-up after the surgery.

Prevention of ovarian hyperstimulation syndrome in a rat model: efficacy comparison between cabergoline and meloxicam.

OBJECTIVE: To compare the efficacy of cabergoline (Cb2) and meloxicam in curbing vascular endothelial growth factor (VEGF) expression and preventing ovarian hyperstimulation syndrome (OHSS). DESIGN: Randomized controlled, animal study. SETTING: Academic facility. SAMPLE: We used a total of 50 immature Wistar female rats randomly to create an experimental OHSS model. METHODS: Ten rats each formed the control group and mild OHSS group. The remaining 30 were separated into three equal groups of severe OHSS. Mild and severe OHSS were induced through ovarian stimulation with gonadotropins. One group with severe OHSS was administered a low-dose 100 microg/kg Cb2 therapy; another group with severe OHSS received 600 microg/kg meloxicam. Body weight, vascular permeability (VP), VEGF expression, ovary weight, and diameter were then compared. MAIN OUTCOME MEASURES: The efficacy of Cb2 and meloxicam for preventing OHSS. RESULTS: Comparison of the severe OHSS groups with the controls and mild OHSS group revealed significant increases in VEGF expression, VP, ovary weight, and diameter. The increase in VEGF expression was demonstrated to be dependent on human chorionic gonadotropin doses. However, low-dose Cb2 and meloxicam therapies were shown to be ineffective in decreasing VEGF expression and VP, ovary weight, and ovary diameter in severe OHSS. CONCLUSIONS: VEGF elevation played a critical part in OHSS pathogenesis, but the therapies administered failed to curb VEGF expression.

Serum paraoxonase and arylesterase activities in patients with epithelial ovarian cancer.

OBJECTIVE: The HDL-associated paraoxonase and arylesterase activities play a role in decreasing oxidative stress, which is known to contribute to cancer development. The aim of this study was to evaluate serum paraoxonase and arylesterase activities and lipid hydroperoxide (LOOH) levels in patients with newly-diagnosed epithelial ovarian cancer. MATERIALS: Serum paraoxonase and arylesterase activities, total free sulfhydryl (-SH) levels and LOOH levels were measured in patients with epithelial ovarian cancer (n=24) and controls (n=29). RESULTS: Serum paraoxonase activity and arylesterase activity, as well as -SH levels were significantly lower (p=0.003, p<0.001 and p<0.001, respectively) in patients with epithelial ovarian cancer compared to controls, while LOOH levels were significantly higher (p<0.001). A significant inverse correlation was found between the stage, grade and CA-125 level of ovarian cancer and paraoxonase activity (rho=-0.630, p=0.001 and rho=-0.601, p=0.002 and rho=-0.436, p=0.033, respectively), arylesterase activity (rho=-0.601, p=0.002 and rho=-0.713, p<0.001 and rho=-0.580, p=0.003, respectively), and -SH levels (rho=-0.642, p=0.001 and rho=-0.637, p=0.001 and rho=-0.530, p=0.008, respectively). In contrast, there was a positive correlation between LOOH and the stage, grade and CA-125 level of ovarian cancer (rho=0.565, p=0.004 and rho=0.479, p=0.018 and rho=0.642, p=0.001). CONCLUSION: Our results suggest that diminished paraoxonase and arylesterase activity, -SH levels and increased LOOH levels are associated with particular stage, grade and CA-125 level of ovarian cancer.

Serum prolidase activity and oxidative status in patients with stage I endometrial cancer.

INTRODUCTION: We aimed to investigate the serum prolidase activity, total oxidant status (TOS), total antioxidant capacity (TAC), and total free sulfhydryl (-SH) groups in patients with stage I endometrial cancer. METHODS: Serum prolidase activity, TOS, TAC, and -SH levels were measured in patients with endometrial cancer (n = 23) and controls (n = 25). RESULTS: Serum prolidase activity and TOS were significantly higher in patients with endometrial cancer than in controls (P = 0.02 and P = 0.02, respectively), whereas TAC and -SH group levels were significantly lower (P = 0.004 and P = 0.001, respectively). There were no differences between surgical stages IA and IB or between stages IB and IC (P = 0.189 and P = 0.161, respectively) with respect to prolidase levels, whereas there was a significant difference between stages IA and IC (P < 0.001). CONCLUSIONS: Increased serum prolidase activity and oxidative stress may be associated with endometrial cancer, and increased serum prolidase activity may be related to local invasion of endometrial cancer.

Serum prolidase activity and oxidative stress markers in pregnancies with intrauterine growth restricted infants.

AIM: To compare the levels of serum prolidase activity and oxidative stress markers, including total oxidative status (TOS), total antioxidant capacity (TAC), oxidative stress index (OSI), and total free sulfhydryl (-SH) in healthy pregnant women and pregnant women with intrauterine growth restricted infants. METHODS: Serum samples were obtained from 18 healthy third trimester pregnancies and 14 pregnancies complicated by fetal growth restriction (FGR). The criteria for FGR were clinical evidence of suboptimal growth, ultrasonographic demonstration of deviation from normal percentiles of growth, and birthweight under the 10th percentile. We spectrophotometrically measured serum prolidase activity, TAC, TOS, and -SH levels. Oxidative stress was determined from total antioxidant capacity and total oxidant status measurement and calculation of the oxidative stress index. RESULTS: Serum TAC and -SH levels were significantly lower in the FGR group than in the healthy control group (P = 0.001, P < 0.001, respectively), whereas TOS level, OSI value, and prolidase activity were significantly higher (P = 0.003, P < 0.001, P < 0.001, respectively). Prolidase activity was positively correlated with TOS and OSI values (rho = 0.552, P = 0.041 and rho = 0.635, P = 0.015, respectively) and negatively correlated with TAC and -SH levels (rho = -0.578, P = 0.030 and rho = -0.622, P = 0.018, respectively). CONCLUSION: The present study shows that serum prolidase activity and oxidative stress are significantly associated with the presence of FGR and that the correlation between serum prolidase activity and markers of oxidative stress are represented as increased serum TOS level and decreased serum TAC and -SH levels, suggesting an association of collagen turnover and oxidative stress in vascular dysfunction.

Color Doppler analysis of pelvic arteries following bilateral internal iliac artery ligation for severe postpartum hemorrhage.

OBJECTIVE: To compare Doppler blood flow characteristics of the uterine, arcuate, and ovarian arteries of women who underwent bilateral internal iliac artery ligation with those of controls. METHODS: Thirteen women who underwent bilateral internal iliac artery ligation for severe postpartum hemorrhage (PPH) were matched with 15 healthy women of reproductive age. Transvaginal color and pulsed (duplex) Doppler modes were used to visualize the pelvic arteries. The pulsatility index, the resistance index, the systolic/diastolic blood flow ratio, the peak systolic velocity, and the end-diastolic velocity were measured. RESULTS: The mean age was 26.1+/-5.2 years in the study group and 27.0+/-5.4 years in the control group. All participants had regular menstrual periods. There were no significant differences between the groups regarding each of the vascular indices for the uterine, arcuate, and ovarian arteries. CONCLUSION: These findings are consistent with published data demonstrating that pelvic circulation is not compromised after bilateral internal iliac artery ligation.

What should be the ideal time for ischemic preconditioning in a laparoscopic rat model?

BACKGROUND: Pneumoperitoneum (Pp) induces an ischemia and reperfusion (I/R) injury as a result of released oxidative stress markers. Ischemic preconditioning (IP) is one of the used methods to reduce the harmful effects of Pp, which is a mechanism for reducing organ I/R injury by a brief period of organ ischemia. The aim of this study was to investigate the ideal time for IP in the laparoscopic model. METHODS: Thirty-two rats were assigned into four groups: group 1 (control, n = 8) was subjected to a sham operation. Group 2 (5-minutes IP, n = 8) was subjected to 5 minutes of Pp with 15 mm Hg of pressure followed immediately by 5 minutes of deflation, and after that, 60 minutes of Pp with 15 mm Hg, followed by 60 minutes of deflation. Group 3 (10-minutes IP, n = 8) was subjected to 10 minutes of Pp and 10 minutes of deflation. Group 4 (Pp only, n = 8) was subjected to 60 minutes of Pp with 15 mm Hg of pressure, followed by 60 minutes of deflation. At the end of the experiment, plasma malondialdehyde (MDA) values, the oxidative stress marker, and plasma-reduced glutathione (GSH) levels, the marker showing antioxidant activity, were determined. RESULTS: Highest plasma MDA values were in group 4 (Pp only), followed by groups 2 and 3 and group 1 (P = 0.181). In addition, IP groups had almost the same values for MDA. Plasma GSH levels in the control group were significantly higher than those in the IP groups and the Pp-only group (P < 0.001). Similarly, as in MDA levels, no difference was found between plasma GSH levels of the IP 5-minutes and IP 10-minutes groups. CONCLUSIONS: Five minutes of the IP model may be as reliable as 10 minutes of the IP model. In that case, 5 minutes of IP can be more suitable in reducing I/R injury in laparoscopy.