Omental metastases in clinical stage I endometrioid adenocarcinoma

Range of Resection in Endometrial Cancer-Clinical Issues of Made-to-Measure Surgery

Endometrial cancer (EC) poses a significant health issue among women, and its incidence has been rising for a couple of decades. Surgery remains its principal treatment method and may have a curative, staging, or palliative aim. The type and extent of surgery depends on many factors, and the risks and benefits should be carefully weighed. While simple hysterectomy might be sufficient in early stage EC, modified-radical hysterectomy is sometimes indicated. In advanced disease, the evidence suggests that, similarly to ovarian cancer, optimal cytoreduction improves survival rate. The role of lymphadenectomy in EC patients has long been a controversial issue. The rationale for systematic lymphadenectomy and the procedure of the sentinel lymph node biopsy are thoroughly discussed. Finally, the impact of the molecular classification and new International Federation of Gynecology and Obstetrics (FIGO) staging system on EC treatment is outlined. Due to the increasing knowledge on the pathology and molecular features of EC, as well as the new advances in the adjuvant therapies, the surgical management of EC has become more complex. In the modern approach, it is essential to adjust the extent of the surgery to a specific patient, ensuring an optimal, made-to-measure personalized surgery. This narrative review focuses on the intricacies of surgical management of EC and aims at summarizing the available literature on the subject, providing an up-to-date clinical guide.

Risk factors for omental metastasis and the effect of omentectomy on survival in type 2 endometrial cancer patients

To investigate the risk factors for occult omental metastasis and the effect of omentectomy on the survival of type 2 endometrial cancer (EC) patients. This study enrolled patients who were diagnosed with high-risk (grade 3, serous, clear cell, undifferentiated, carcinosarcoma, or mixed type) EC between 2000 and 2021 and underwent surgery in our center. Data from 482 patients were analyzed retrospectively. Omentectomy was performed in 405 (84.0%) patients. Omental metastases were detected in 61 (12.7%) patients. Eighteen (29.5%) of these metastases were occult. Adnexal involvement, malignant cytology, and peritoneal spread were independent risk factors for omental metastasis. The 5-year overall survival (OS) rate was 59.5% in patients who underwent omentectomy and 64.7% in those who did not (P = 0.558). In patients with and without omental metastases, the overall 5-year OS rates were 34.9% and 63.5%, respectively (P < 0.001). The 5-year OS rates of patients with a normal omentum, gross tumors, and occult metastases were 63.5%, 26.9%, and 52.5%, respectively (P < 0.001). Omental metastases is not uncommon in type II endometrial cancer; approximately one third of patients have occult metastases. Factors - positive cytology, adnexal involvement, and peritoneal involvement are associated with higher probability of omental metastases.

Endometrial carcinoma: association between mutational status, sites of metastasis, recurrence, and correlation with overall survival

PURPOSE

To investigate the association between sites of endometrial carcinoma (EC) recurrence and metastases, mutational status, race, and overall survival (OS).

METHODS

This single-center retrospective study evaluated patients with biopsy-proven EC that underwent genomic molecular testing between January 2015 and July 2021. Association between genomic profile and sites of metastases or recurrence was performed using Pearson's chi-squared or Fisher exact test. Survival curves for ethnicity and race, mutations, sites of metastases or recurrence were estimated using the Kaplan-Meier method. Univariable and multivariable Cox proportional hazard regression models were used.

RESULTS

The study included 133 women [median age 64 years (IQR 57-69)]. The most common mutation was TP53 (65/105 patients, 62%). The most common site of metastasis was the peritoneum (35/43, 81%). The most common recurrence was in lymph nodes (34/75, 45%). Mutations of TP53 and PTEN were significantly associated with Black women (p = 0.048, p = 0.004, respectively). In the univariable Cox regression analyses, TP53 mutation and presence of recurrence or metastases to the peritoneum were associated with lower OS (HR 2.1; 95% CI 1.1, 4.3; p = 0.03/ HR 2.9; 95% CI 1.6, 5.4; p = 0.0004; respectively). On multivariable Cox proportional hazards model ER expression (HR 0.4; 95% CI 0.22, 0.91; p = 0.03), peritoneal recurrence or metastases (HR 3.55; 95% CI 1.67, 7.57; p = 0.001), and Black race (HR 2.2; 95% CI 1.1, 4.6; p = 0.03) were significant independent predictors of OS.

CONCLUSIONS

The integration of EC mutational status and clinicopathological risk assessment demonstrated potential implications on the patterns of metastasis, recurrence, and OS.

Significance of positive peritoneal cytology for recurrence and survival in patients with endometrial cancer

AIM

This study aims to examine the association between malignant peritoneal cytology and prognosis in women with endometrial cancer.

METHODS

We retrospectively analyzed the records of patients with endometrial cancer who underwent surgery with intraoperative peritoneal cytology at our hospital between January 1988 and December 2012. All results were reclassified according to the 2009 International Federation of Gynecology and Obstetrics (FIGO) system, and the relation between intraoperative peritoneal cytology results and recurrence and prognosis was examined.

RESULTS

Of the 908 patients analyzed, 205 (22.6%) had positive peritoneal cytology. Patients with positive peritoneal cytology had significantly lower rates of recurrence-free survival (RFS) and overall survival (OS) than those in the negative cytology group (both p < 0.001). Subgroup analysis of patients with FIGO stage I/II showed significantly lower RFS in the positive-cytology group (p = 0.005), but there was no significant difference in OS (p = 0.637). In the patients with FIGO stage III/IV or patients classified as "high risk," the RFS and OS were significantly lower in the positive-cytology group (both p < 0.001). Cox regression analysis identified positive peritoneal cytology as a significant predictor of recurrence in patients with FIGO stage I/II disease.

CONCLUSIONS

Patients with positive peritoneal cytology for endometrial cancer have a high risk of recurrence, regardless of histopathologic type or FIGO stage. Peritoneal cytology has already been removed from the 2009 FIGO classification of endometrial cancer, but it may deserve reconsideration.

Suspicious Positive Peritoneal Cytology (Class III) in Endometrial Cancer Does Not Affect Prognosis

Positive peritoneal cytology is a poor prognostic factor in patients with advanced endometrial cancer. Suspicious positive peritoneal cytology (class III) is commonly encountered in clinical practice. However, no standard treatment protocol exists for its management. Here, we investigated a possible relationship between suspicious positive peritoneal cytology, disease stage, risk factors, and endometrial cancer prognosis. We included patients diagnosed with endometrial cancer who underwent total hysterectomy and peritoneal cytology at the University of Tokyo Hospital between 2008 and 2022. Overall, 670 patients were included in the analyses; both demographic and clinical data of the patients were collected. The proportion of patients with lymph node metastasis was significantly different between peritoneal cytology groups, showing lymph node metastasis to be more extensive in patients with positive or suspicious positive peritoneal cytology than in patients with negative peritoneal cytology (p < 0.05). Thirty-nine patients had suspicious positive peritoneal cytology. Omental resection and biopsy were performed in 16 cases. No case of omental metastasis was found. Among patients with suspected ascites cytology, no patient experienced symptom recurrence or death. Therefore, monitoring lymph node metastasis in suspicious positive cases is essential. Moreover, a change of treatment method based on the finding of suspected positive peritoneal cytology is not necessary.

Data Set for the Reporting of Endometrial Cancer: Recommendations From the International Collaboration on Cancer Reporting (ICCR)

Endometrial cancer is one of the most common cancers among women. The International Collaboration on Cancer Reporting (ICCR) developed a standardized endometrial cancer data set in 2011, which provided detailed recommendations for the reporting of resection specimens of these neoplasms. A new data set has been developed, which incorporates the updated 2020 World Health Organization Classification of Female Genital Tumors, the Cancer Genome Atlas (TCGA) molecular classification of endometrial cancers, and other major advances in endometrial cancer reporting, all of which necessitated a major revision of the data set. This updated data set has been produced by a panel of expert pathologists and an expert clinician and has been subject to international open consultation. The data set includes core elements which are unanimously agreed upon as essential for cancer diagnosis, clinical management, staging, or prognosis and noncore elements which are clinically important, but not essential. Explanatory notes are provided for each element. Adoption of this updated data set will result in improvements in endometrial cancer patient care.

Endometrial cancer from early to advanced-stage disease: an update for radiologists

The purpose of this article is to review the current molecular classification of endometrial cancer, the imaging findings in early and advanced disease, and the current management strategies, focusing on the new systemic therapies for advanced EC. In recent years, the management of endometrial cancer has significantly changed. The molecular characterization of endometrial cancer has shed new light into the biologic behavior of this disease, the International Federation of Gynecology and Obstetrics staging system was recently revised, and imaging was formally incorporated in the management of endometrial cancer. Recent genomic analysis of endometrial cancer led to the approval of new molecular-targeted therapies and immune checkpoint inhibitors. Imaging allows assessment of myometrial invasion, cervical stromal extension, lymph node involvement and distant metastases, and has a crucial role for treatment planning. Treatment strategies, which include surgery, radiation and systemic therapies are based on accurate staging and risk stratification.

Is there a benefit of performing an omentectomy for clinical stage I high-grade endometrial carcinoma?

OBJECTIVES

Routine omentectomy is generally not performed in patients with endometrial cancer unless there is evidence of gross omental metastases. The aim of the current study was to evaluate the role of omentectomy in the staging of clinical stage I high-grade endometrial carcinoma and its impact on overall survival.

METHODS

Patients in the National Cancer Database who presented between 2010 and 2015 with clinical stage I serous, clear cell, carcinosarcoma, or grade 3 endometrioid carcinoma and underwent hysterectomy with lymphadenectomy were selected. Patients who did and did not receive an omentectomy were identified and clinico-pathological characteristics were compared. Overall survival was evaluated for patients diagnosed between 2010 and 2014 who had at least one month of follow-up following generation of Kaplan-Meier curves and comparison with the log-rank test. A Cox model was constructed to control for confounders.

RESULTS

A total of 9097 patients were identified, and 36.3% underwent an omentectomy. Patients who underwent omentectomy were more likely to be managed in academic institutions (50% vs. 44%, p < 0.001). They were also more likely to have an open surgery (48.2% vs. 27.2%, p < 0.001) and receive adjuvant chemotherapy (54.7% vs. 38.2%, p < 0.001). There was no difference in overall survival between patients who did and did not undergo omentectomy, p = 0.61; the 3-year OS rates were 82.3% and 82.2%, respectively. After controlling for confounders, the performance of an omentectomy was not associated with better survival (hazard ratio [HR]: 0.94, 95% confidence intervals [CI]: 0.84, 1.05).

CONCLUSIONS

Routine omentectomy may not be associated with a survival benefit for patients with clinical stage I high-grade endometrial carcinoma.

Histologic grade and peritoneal cytology as prognostic factors in type 1 endometrial cancer

BACKGROUND

Prognostic clinicopathological factors for type 1 endometrial cancer are unknown and the purpose of the current study was to determine the independent prognostic variables for type 1 endometrial cancer.

METHODS

We performed a retrospective study of 168 patients with type 1 endometrial cancer primarily treated with comprehensive staging surgery. The median follow-up time was 68 (12-100) months. Independent risk factors for disease-free survival (DFS) and overall survival (OS) were determined using multivariate Cox regression models. Sub-group analysis of stage I was also performed. We also assessed the patterns of failure among patients with recurrences and investigated the associations with the prognostic variables determined by multivariate analysis.

RESULTS

Twenty patients (11.9%) had recurrence and 13 patients (7.7%) died of the disease overall. Multivariate analysis revealed that grade 2 (G2) histology (p = 0.008) and positive peritoneal cytology (p = 0.001) predicted the recurrent event in type 1 endometrial cancer. G2 histology (p = 0.007) and positive peritoneal cytology (p = 0.003) were also found to be independent risk factors for tumor-related deaths. Among stage I patients, G2 histology and positive peritoneal cytology were also independent prognostic variables for DFS and OS. Patients with G2 histology and/or positive peritoneal cytology were more likely to have recurrence at distant sites.

CONCLUSIONS

G2 histology and positive peritoneal cytology were independent prognostic factors for DFS and OS in type 1 endometrial cancer.

Optimal sampling of grossly normal omentum in staging of gynecologic malignancies

The pathologic detection of microscopic omental metastases is important for the staging and treatment of ovarian and endometrial cancer. The question of how to sample grossly negative omentectomy specimens has not been adequately answered. We reviewed our institutional experience by retrieving a series of gynecologic cancer cases from 1998 to 2013 in which the omentum was grossly negative, but microscopically positive. There were 21 patients with ovarian carcinoma, 7 with ovarian borderline tumors, and 16 with endometrial carcinoma (44 patients in total). Cases in which the omentum was grossly abnormal or suspicious were excluded. A mean of 5.2 blocks were submitted per case (range, 4-15), of which a mean of 2.7 were positive for metastatic disease (range, 1-5). The distribution of cases by percentage of blocks positive was bimodal: some cases showed only 1 or 2 foci of disease in the entire sampled omentum, whereas in other cases nearly every block was positive. Only 3 cases had been sampled with >5 blocks. We used a series of simulated cases, bootstrapped on the retrospective series, to determine the additional sensitivity conferred by submitting >5 blocks. This model indicated that 5 blocks will, in fact, be insufficient to capture microscopic metastases in some cases. Examination of 5 blocks has an estimated sensitivity of 82%, whereas submission of 10 blocks raises the sensitivity to 95%. These results suggest that submission of 10 blocks should be considered for grossly negative omentectomy specimens when other staging is negative.

Microscopic Omental Metastasis in Clinical Stage I Endometrial Cancer: A Meta-analysis

BACKGROUND

A patient with early-stage endometrial cancer may possibly have microscopic metastasis in the omentum, which is associated with a poor prognosis. The purpose of this study was to identify risk factors for microscopic omental metastasis in patients with clinical stage I endometrial cancer to establish the indications for selective omentectomy.

METHODS

We searched the PubMed, EMBASE, and Cochrane Library databases for published studies from inception to August 2014, using terms such as 'endometrial cancer' or 'uterine cancer' for disease, 'omentectomy' or 'omental biopsy' for intervention, and 'metastasis' for outcome. Two reviewers independently identified the studies that matched the selection criteria. We calculated the pooled risk ratios (RRs) with 95 % confidence intervals (CI) of each surgicopathologic finding for microscopic omental metastases in clinical stage I endometrial cancer. We also calculated the prevalence of microscopic omental metastases.

RESULTS

Among 1163 patients from ten studies, 22 cases (1.9 %) of microscopic omental metastases were found, which accounted for 26.5 % of all omental metastases. Positive lymph nodes (RR 8.71, 95 % CI 1.38-54.95), adnexal metastases (RR 16.76, 95 % CI 2.60-107.97), and appendiceal implants (RR 161.67, 95 % CI 5.16-5061.03) were highly associated with microscopic omental metastases.

CONCLUSIONS

Microscopic omental metastases were not negligible in patients with clinical stage I endometrial cancer. Those with a risk factor of microscopic omental metastases were recommended for selective omentectomy.

What is the importance of omental metastasis in patients with endometrial cancer?

OBJECTIVE

To identify surgico-pathologic factors, survival, and the factors determining survival in patients with omental metastasis from endometrial cancer.

MATERIAL AND METHODS

Patients with endometrial cancer operated on between 1993-2012 in our hospital and who had omental metastases were included. Patients with either uterine sarcoma or synchronous tumors were excluded.

RESULTS

Omentectomy was performed in 811 patients with endometrial cancer, and omental metastasis was found in 48 (5.9%) patients. Tumor type was endometrioid cancer in 26 patients. Omental metastasis was macroscopic and microscopic in 60% and 40% of the patients, respectively. Total omentectomy increased the chance of detection of the microscopic metastases. Among the patients with omental metastasis, 68.8% had positive peritoneal cytology, 66.7% had adnexal involvement, 60.5% had metastases in the lymph nodes, 47.9% had cervical involvement, and 29.2% had serosal involvement; 43.8% of these patients had intra-abdominal spread beyond the omentum, adnexa, and peritoneal cytology. Two-year disease-free survival (DFS) was 28.2%, and 2-y overall survival (OS) was 40%. The depth of myometrial invasion, grade, cytology, and status of pelvic lymph nodes affected 2-y DFS, while cervical invasion and cytology affected 2-y OS.

CONCLUSION

Omental metastasis in endometrial cancer means poor prognosis, and two-thirds of these patients are lost at the end of the second year. Although total omentectomy increases the chance of the detection of micrometastases, its effect on survival is controversial. New treatment modalities are necessary in this patient group.

Should omentectomy be a part of surgical staging in patients with endometrioid adenocarcinoma of the uterine corpus?

BACKGROUND

The purpose of the study was to determine the prevalence of omental metastasis in endometrioid adenocarcinoma and to correlate risk variables with this spread.

METHODS

A retrospective analysis of patients with endometrioid adenocarcinoma who underwent omentectomy in addition to staging laparotomy was performed.

RESULTS

Omental metastases were noted in 11 of the 322 patients with endometrioid adenocarcinoma (3.4%). Multivariate analyses showed that there was a significant correlation between omental metastasis and positive peritoneal cytology, adnexal involvement, and grade 3 tumor (p = 0.028, p = 0.001, and p = 0.01, respectively). There was no statistical relationship between omental metastasis and lymphovascular space involvement, deep myometrial invasion, and lymph node metastasis (p = 0.087, p = 0.97, and p = 0.92, respectively).

CONCLUSION

Grade 3 endometrioid adenocarcinomas, especially those that are complicated by deep myometrial invasion, have a pattern of intra-abdominal spread similar to more aggressive endometrial cancers, with frequent involvement of the omentum. Overall, we conclude that 37.5% (3/8) of patients who had a grade 3 tumor and omental metastasis stage IV disease would have been missed if a staging operation similar to that employed for ovarian cancer had not been performed.

Identification of MXRA5 as a novel biomarker in colorectal cancer

In our previous study, significantly high expression levels of matrix-remodeling associated 5 (MXRA5) were identified in fresh-cultured colorectal cancer (CRC) tissues compared with their normal adjacent mucosa by differential secretome analysis. Whether MXRA5 is a potential serum biomarker of CRC has not been evaluated. The aim of this study was to investigate the association between MXRA5 expression and clinicopathological characteristics of CRC patients. The MXRA5 expression levels were determined by quantitative real-time PCR (qRT-PCR) and immunohistochemistry (IHC) in 20 colorectal adenoma tissues, 156 CRC tissues and their corresponding adjacent normal mucosa. Relative quantity (RQ) value and immunoreactive score (IRS) were used for quantitative assessment. The staining for MXRA5 protein was mainly located in the cytoplasm of CRC cells. All CRC tissues were positively stained, with a higher expression rate (IRS>4) of 67% (105/156), and a lower expression rate (IRS≤4) of 33% (51/156). Meanwhile, their corresponding normal tissues exhibited little positive staining; the higher expression rate was 0% (0/156) and the lower expression rate was 25% (16/156). Additionally, more than half of the adenoma tissues were positively stained; the higher expression rate was 15% (3/20) and the lower expression rate was 50% (10/20). The MXRA5 protein positive staining rates were significantly correlated with the lesion sites (colon vs. rectum, 76 vs. 59%), TNM staging (I+II vs. III+IV, 56 vs. 73%) and metastasis (present vs. absent; 76 vs. 61%) with the most high positive staining rate observable in omental metastasis (82%). However, MXRA5 mRNA expression levels showed no significant differences between CRC tissues and their corresponding normal tissues, and no significant correlation between IRS and corresponding RQ value was observed. In this study, we present the first evaluation of MXRA5 protein expression in CRC tissue. Our results revealed that MXRA5 protein is aberrantly expressed in CRC tissues, and has potential value in early detection of CRC and prediction of omental metastasis.

Pro-inflammatory and tumour proliferative properties of excess visceral adipose tissue

Obesity has been associated with increased incidence and mortality of oesophageal and colorectal adenocarcinoma. Excess central adiposity may drive this association through an altered inflammatory milieu. Utilising a unique adipose tissue bioresource we aimed to determine the pro-tumour properties of visceral adipose tissue. Comparing subcutaneous and visceral adipose tissue depots, we observed significantly higher levels of VEGF and IL-6, along with significantly higher proportions of CD8(+) T cells and NKT cells in visceral adipose tissue. Significantly higher levels of VEGF were observed in the conditioned media from visceral adipose tissue of centrally obese compared to non-obese patients. We also report a significant increase in oesophageal and colorectal tumour cell proliferation following culture with conditioned media from visceral adipose tissue of centrally obese patients. Neutralising VEGF in the conditioned media significantly decreased tumour cell proliferation. This novel report highlights a potential mechanism whereby visceral adipose tissue from centrally obese cancer patients may drive tumour progression.