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*Corresponding Author: Carmen Manuela Tauste Rubio, Gynecology and Obstetrics in the Navarre Health System – Osasunbidea, university of Barcelona, Spain
Citation: Carmen Manuela Tauste Rubio (2021) Little Clinical Relevance of Ca125, Cea and Ca125/Cea Ratio for the Differential Diagnosis of Ovarian and Non- Ovarian Carcinomatosis. J. Women Health Care and Issues 4(5); DOI: 10.31579/2642-9756/064
Copyright: © 2021 Carmen Manuela Tauste Rubio, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 12 May 2021 | Accepted: 28 May 2021 | Published: 17 June 2021
Keywords: CA125; CEA; carcinomatosis; ovarian mass; ovarian tumor; ovarian cancer
Background
In women, peritoneal cancer is commonly associated to epithelial ovarian cancer. Ovarian peritoneal carcinomatosis patient survival appears to be better in comparison to other peritoneal Malignancies, e.g., colorectal neoplasms or mesotheliomas. Here, we aim to analyze the value of CA125, CEA, CA125/CEA ratio (CCR) tumor markers as preoperative tools for the diagnosis ovarian cancer.
Material and methods:
From 2005-2008, we recruit prospectively patients admitted to the Navarre Hospital Complex Gynecological service with peritoneal carcinomatosis and suspicion of ovarian cancer origins. The final diagnosis of ovarian cancer carcinomatosis or other malignancies was obtained through Biopsy or cytology. CA 125, CEA and CCR were determined from preoperative venous blood Samples. We compared the tumor markers values between groups of ovarian cancer carcinomatosis and non-ovarian cancer carcinomatosis and calculate the receiver operating curves (ROC) for CA 125, CEA and CCR.
Results
From 250 patients with suspicion of having ovarian peritoneal carcinomatosis, only 86.4% of the Cases were finally diagnosis of ovarian cancer. Sensitivities of CA125 > 35 mg/dL, CEA < 5 ngr/mL, and CCR > 25 were 95.5%, 91.9%, and 93.6% with specificities of 4.6%, 40.9% and 40.0%, respectively. ROC displayed poor performance for CA125 and CEA for detecting ovarian peritoneal carcinomatosis patients (area under the curve (AUC): 0.69 and 0.63, respectively) while ROC analysis of CCR showed better results (AUC: 0.74).
Conclusions:
CCR is somehow useful to differentiate between ovarian and non-ovarian peritoneal carcinomatosis patients in comparison with CA125 and CEA alone, although without sufficient specificity for improving the differential diagnosis.
Epithelial ovarian cancer (EOC) represents 95% of all ovarian malignancies with the majority of patients in advanced-stage of the disease at presentation.[1] EOC encompasses the epithelial malignancies of ovaries, fallopian tubes and peritoneal primary site, due to their common pathogenic mechanisms. [2, 3] Peritoneal carcinomatosis (PC) is a late-stage manifestation of ovarian cancer, as well as of other malignancies such as colorectal or gastric cancers with different prognosis and treatment. [4, 5] To date, a confirmatory biopsy is mandatory for a definitive diagnosis of ovarian carcinomatosis.
Serum biomarkers may be useful to predict EOC diagnosis. Cancer antigen 125 (CA125) and the carcinoembryonic antigen (CEA) are routinely used in patients suspected of having ovarian cancer.[6] Although much research has been devoted to investigate these biomarkers, the reports usually refer to ovarian cancer in general with no differentiation between stages.
Serum CA125 glycoprotein level is the most widely studied biochemical screening method for ovarian cancer. The standard threshold is 35 mg/dL. Ovarian cancer raises CA125 50% in stages I and II and up to 90% in stages III and IV [7]. Frequently, its concentration may rise in certain gynecological conditions, e.g., endometriosis, leiomyomas and pelvic inflammatory disease, as well as in other non-gynecological disorders, such as hepatic cirrhosis and heart failure. Furthermore, CA125 values may be elevated in 1% of the normal population [8]. In 2000, Meyer et al. showed that 82% of subjects with ovarian cancer and 28% of patients with non-gynecological cancers (including pancreatic, breast, and colon cancers) have increased CA125 levels. [8]
The CEA is normally produced in fetal tissue; however, it may also be synthesized in certain type of carcinomas. Serum concentrations exceeding 5 ng/ml are often found in patients with colorectal, gastric, breast or lung cancer, as well as in certain types of gynecological tumors. Furthermore, elevated CEA concentrations may associate with infection, pancreatitis, hepatic cirrhosis and some benign tumors. In colorectal cancer, CEA values above 20 ng/ml have clinical relevance because of the relationship with metastasis [8]. Serum CEA is elevated in approximately 35% of all ovarian cancer patients and occurs more often in mucinous tumors (88%) than in serous ones (19%) [9].
Tests with CA125/CEA ratio (CCR) have been carried out aiming to differentiate ovarian cancers from non-ovarian cancers in pelvic masses. [9] However, no special consideration was given to tumor stage or load. In 1990, Buamah et al published a study with 155 patients who had elevated CA125 concentrations from which 47 patients had been diagnosed ovarian cancer, 38 colorectal cancer, 24 cervical cancer, 17 gastric cancer, and 9 pancreatic cancer. [10] The authors report that a CA125/CEA ratio above 25 may be used as a tool to differentiate ovarian cancer from the other diagnoses. Yedema et al in 1992 studied the CCR in 47 cases of advanced EOC and 24 cases of colorectal cancer. A CA125/CEA ratio over 25 showed 91% sensitivity and 100% specificity for detecting CCR ovarian cancer. [11] In 2011, Sørensen et al. published a trial with 640 patients (ovarian laboratory investigation). In this population, malignant diagnosis was confirmed in 355 subjects: 248 ovarian tumors and 107 non-ovarian tumors. The outcomes improved with CCR in comparison with CA125 or CEA alone, achieving a specificity of 86% when the cut-off value was increased from 25 to 100. [12] It is remarkably that EORTC-55971 trial in 2011, led by Ignace Vergote, used CCR higher than 25 as one of the criteria for patient recruitment
In the present study, we aim to analyze the value of our routine tumor markers CA125 and CEA and the CCR as preoperative tools to differentiate between ovarian and non-ovarian primary cancer in patients with carcinomatosis.
Material and Methods:
Between January 2005 and December 2016, we recruited 250 patients who were admitted to the Navarre Hospital Complex (Spain) Department of Gynecologic Oncology with suspicion of ovarian carcinomatosis. We prospectively identified and registered all of these women in a database designed specially to assess the diagnostic process. Recruitment criteria were radiological suspicion of peritoneal surface malignancy through computed tomography scans [13] or surgical procedure and final pathological diagnosis. As the recruitment was prospective, the EOC patients without carcinomatosis were not included. In all suspicious patient we requested the serum tumor markers prior the main treatment per protocol.[6] After pathologic or cytologic study, the diagnostic of non- malignant disease of peritoneum was the single exclusion criteria.
Tumor marker blood tests were performed during the diagnostic procedure. Age, Main Symptom and Performance status (PS) data as the ECOG-PS scale were collected at the beginning of the diagnosis. [14]
We generated descriptive statistics for all the measurements: means, ranges, and standard deviations for continuous variables, and frequencies and proportions for categorical data. Continuous variables were compared using Student´s t-test and categorical variables using the Chi-squared. Patient survival was calculated applying the Kaplan Meier method using the date of the diagnosis until a known date of follow-up evaluation or date of death. Receiver operating characteristics (ROC) analysis was used to estimate specificity and sensitivity. The resulting area under the curve (AUC) indicates the average sensitivity of a marker over the entire ROC curve for ovarian PC versus non-ovarian PC. ROC analysis was plotted to examine optimal cut-off values that maximized the sum of sensitivity and 1-specificity. A p value < 0.05 was considered a statistically significant difference. Statistical analysis was performed with the SPSS statistical software package, version 25.0 (SPSS Inc., Chicago, IL, USA).
From the 250 patients admitted to the hospital suspected of having carcinomatosis, the final diagnostic technique was biopsy in 93.6% and cytology in 6.4% of the cases. We diagnosed 216 (86.4%) epithelial ovarian, tube or peritoneal cancers, 33 (13.2%) non-ovarian carcinomatosis and one peritoneal tuberculosis (0.4%) which were excluded from the study. Non-ovarian carcinomatosis had a wide diversity of origins: uterus in six patients, appendix in six, mesothelioma in four, pancreas in four, colon and rectum in three, small bowel in two, gastric in two, lungs in two, and miscellaneous in the remaining six patients (Figure 1).
Preoperative differentiation between ovarian and non-ovarian primary site PC is extremely important for a quality management. Despite the interest of a reliable and quick test in PC, CA 125, CEA and CCR showed poor performance to diagnose EOC.
Initially, the increase of CA125 with low CEA and the presence of an ovarian mass seemed suitable tools for predicting the origin of the PC. In fact, in the EORTC-55971 trial carried out by Ignace Vergote among the recruitment criteria was a fine-needle aspirate showing an adenocarcinoma and presence of a pelvic (ovarian) mass or a cancer antigen 125 (CA-125, KUI/mL) to carcinoembryonic antigen (CEA, ng/mL) ratio greater than 25 [14]. Despite these common criteria for suspecting ovarian PC, our clinical data are discouraging in this sense.
As other studies [10, 15], CA125 levels shows for ovarian PC are higher than in non-ovarian PC, although CA125 has not demonstrated preoperative with the classic cut-off > 35 mg/dL. The increase in CA 125 threshold did not show better performance due to the consequent detriment of sensitivity. In addition, the ROC analysis represented a poor model for differentiating between ovarian and non-ovarian PC (Table 3, Figure 3A).
According to Høgdall et al., CEA does not seem useful for discarding non-ovarian malignancies because CEA is elevated in approximately 35% in ovarian tumors, particularly in mucinous types. [16] In our series, CEA < 5 mm sensitivity is 91.9% but with a limited specificity of 40.9%. Although, the ROC curve showed better performance than CA 125, AUC continued been poor to differentiate ovarian from non-ovarian PC patients (Figure 3.B).
CCR was designed to improve the performance of tumor markers for discriminating ovarian from non-ovarian malignancies. The studies by Buamah [10] and Yedema [11] showed a good accomplishment of CCR. Moro et al tested the role of CCR to identify the metastatic showed the low ability of CCR to distinguish between primary ovarian lesions from metastatic lesions.[17] Unlike Moro study, our sample is composed by patients with carcinomatosis, however the power of CCR as a discriminative test showed the ROC curve performance only has an acceptable AUC (0.74). The standard threshold described by the above-mentioned authors (CCR > 25) shows low specificity (40.0%). We modified the cut-off value in order to enhance the specificity, as was done by Sørensen et al. [12] in our case, we had to raise the threshold to 250 to achieve a specificity of 72.5%, which caused an important decrease in the sensitivity (55%). Considering these results, CCR is not an advantage for the routine management of patients suspected of having ovarian carcinomatosis in our environment. (Figure 3.C)
The importance of this study lies in clarifying which is the real diagnostic role of CA 125, CEA and CCR in the diagnostic of non-ovarian carcinomatosis. Some studies talk about the utility of this serum markers and its ratio referred to the ovarian tumor but not about the relevance of them in peritoneal carcinomatosis. [12, 17] In other studies, the CCR seems to be capital to diagnose non-ovarian peritoneal carcinomatosis [9–11]. In our series the relevance of CA 125, CEA or CCR are not as important to be diagnostic. The limitations of this study are in relation with the selection bias due to, as a gynecological service, we only admitted the patients with high suspicion of gynecological peritoneal malignancy. Maybe, the behavior of these tests could be different among the patients with peritoneal carcinomatosis in digestive service or internal medicine.
Because of the poor predictive value of our standard tumor markers or their ratio and the absence of prediction of ovarian tumor presence or its size, alternative tests should be considered in PC patients. Human epididymis protein (HE4) is highly sensitive for the diagnosis of ovarian cancer and higher specificity in comparison to the CA125. [18, 19]. Additional studies should be carried out to analyze the behavior of HE4 in non-ovarian tumors. Other novel techniques as differential scanning calorimetry (DSC), could become an excellent tool for diagnosis in PC. [20]
The clinical origin of ovarian and non-ovarian PC is very similar. Our standard tumor markers CA125 and CEA and their ratio show statistically significantly differences between ovarian and non-ovarian PC. However, due to their low specificity, they have little clinical relevance to diagnose ovarian PC. Other preoperative tests may have better performance to predict the origin of PC.
Conflicts Of Interest:
Carmen M. Tauste, Jesús Zabaleta, Sara Aguirre, Antonio Llueca and Juan Carlos Muruzábal declare that they have no conflict of interest.
This study was not supported by grant funding. All procedures performed in studies involving human participants followed the ethical standards of the institutional research committee and the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was not obtained for this retrospective study.
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