Yinan Jiang
Haifeng Gu
Xiaojing Zheng- Department of Gynecology, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China
Objectives: The present study aimed to identify the predictive value of inflammatory indexes stratified according to human papillomavirus (HPV) infection status in women with FIGO 2018 stage IB∼IIA cervical cancer. We also explored the influences of HPV infection status on the survival of cervical cancer patients.
Methods: We collected data for 583 women with stage IB∼IIA cervical cancer in Sun Yat-sen University Cancer Center between 2009 and 2017. The t-test, chi-squared (χ2) test and Fisher’s exact test were applied to compare the differences of inflammatory indexes and clinicopathological features between HPV-positive and HPV-negative groups. Univariate and multivariate analyses were used to identify clinicopathological factors that were associated with the prognosis of cervical cancer patients.
Results: There were no differences in overall survival (OS) and progression-free survival (PFS) between HPV-positive and HPV-negative groups. In HPV-positive group, the maximum tumor size, neoadjuvant chemotherapy and the body mass index (BMI) correlated significantly with C-reactive protein/albumin ratio (CAR). The maximum tumor size and the prognostic nutritional index (PNI) correlated significantly with the platelet-lymphocyte ratio (PLR). The maximum tumor size, neoadjuvant chemotherapy and PLR correlated significantly with PNI. Univariate and multivariate analyses showed that the depth of tumor invasion (HR: 3.651, 95% CI: 1.464–9.103, p = 0.005; HR: 2.478, 95% CI: 1.218–5.043, p = 0.012) and CAR (HR: 5.201, 95% CI: 2.080–13.004, p < 0.0001; HR: 2.769, 95% CI: 1.406–5.455, p = 0.003) were independent predictors of poor OS and PFS. PNI was an independent protective factor of OS (HR: 0.341, 95% CI: 0.156–0.745, p = 0.007). PLR was an independent factor of PFS (HR: 1.991, 95% CI: 1.018–3.894, p = 0.044). In HPV-negative group, BMI correlated significantly with CAR. Only depth of invasion (HR: 9.192, 95% CI: 1.016–83.173, p = 0.048) was the independent predictor of poor OS, and no inflammation indexes were independent predictors of prognosis.
Conclusion: In patients with HPV-positive cervical cancer, depth of invasion, PNI and CAR are independent factors of OS, and depth of invasion, PLR and CAR are independent factors for PFS. For patients with HPV-negative disease, no inflammation indexes had predictive value for prognosis. The predictive value of inflammation indexes on prognosis is more significant in patients with HPV-positive cervical cancer. Stratification of HPV infection status promotes a more precise clinical application of inflammation indexes, thus improving their accuracy and feasibility.
Introduction
Globally, uterine cervical cancer (UCC) still ranks fourth for both incidence and mortality among cancers, with about 570,000 new cases and 311,000 deaths each year [1]. To the best of our knowledge, high-risk human papillomavirus (HPV) infection is one of the main risk factors for cervical cancer, and the body inflammatory state influenced by HPV infection is related closely to the progression of cervical cancer [2]. With the popularization of cervical cancer screening and the widespread use of anti-HPV vaccines, the incidence of cervical cancer in developed countries has declined gradually [1–3]. However, because of a large population, uneven economic development, and late application of anti-HPV vaccines, the incidence of cervical cancer in China ranks second in the world, and the proportion of young patients is rising rapidly. Thus, predicting these patients’ life expectancy is vital for clinicians and patients [4]. Pelvic lymph node metastasis is acknowledged as one of the most important prognostic factors [5]. With the update of the Federation of Gynecologists and Obstetricians (FIGO) guidelines, cervical cancer patients with pelvic or para-aortic lymph node involvement are classified as stage IIIC [5, 6]. Therefore, for patients with stage IB∼IIA cervical cancer in the revised staging, the predictive factors that can be used preoperatively remain limited.
Indexes of a systemic inflammatory response (SIR), such as the C-reactive protein (CRP)-albumin (ALB) ratio (CAR), the platelet-lymphocyte ratio (PLR), the prognostic nutritional index (PNI), the neutrophil-lymphocyte ratio (NLR), and the lymphocyte-monocyte ratio (LMR), have been used not only to determine the nutritional status and complications but also to predict prognosis of patients in various cancers [7–11]. As a novel inflammation- and nutrition-based score, CAR has been reported as an independent indicator of poor prognosis in different cancers including lung cancer, colorectal cancer, pancreatic cancer and hepatocellular cancer [12–15]. Platelets are an important component of peripheral blood cells and have complex relations with tumor cells. It’s found that several proinflammatory mediators (e.g., IL1 and IL6) could stimulate and increase plateles counts. Therefore, platelet counts can reflect the inflammatory status to some extent [16]. Besides, platelets activate signalling pathways to induce epithelial-to-mesenchymal-like transition (EMT) and tumor metastasis [17]. Increasing evidences have proven that NLR is a reliable indicator of prognosis in solid tumors. In Zhang’s study with 460 Chinese cervical cancer patients treated with radical surgery, the results showed that there was a significant value of NLR for patients’ prognosis [18]. PLR is also demonstrated as an independent factor for worse OS in ovarian cancer and pancreatic cancer [16, 19]. PNI, which is calculated according to ALB levels and peripheral lymphocyte numbers, reflects both the nutritional and immunal status of patient. Several studies have demonstrated that PNI is a preditive indicator of prognosis in hepatocellular cancer, gastric cancer and pancreatic cancer [20–22]. In recent years, these indexes have gradually attracted attentions for their application as prognostic predictors in solid tumors [23–25].
Although several studies on survival and recurrence outcomes of patients with cervical cancer in various stages have been published, to date, there is no report concerning the impact of HPV infection status on the inflammatory indexes and the prediction of prognosis in patients with cervical cancer. In this study, we firstly divided the patients into HPV-positive group and HPV-negative group, and compared the clinical parameters and prognosis between two groups. We analyzed retrospectively the predictive value of preoperative inflammation markers (PLR, PNI, and CAR) on the prognosis of patients with FIGO 2018 stage IB∼IIA cervical cancer with different HPV infection statuses.
Materials and Methods
Ethics Statement
This retrospective study was performed in accordance with the Declaration of Helsinki and approved by the Ethics Committee of the Sun Yat-sen University Cancer Center Institutional Review Board (IRB-number B2020-345-01). Informed patient consent was waived in this observational and noninterventional study, in which the patient’s data were kept under strict control. The authenticity of this article has been validated by uploading the key raw data onto the Research Data Deposit public platform (www.researchdata.org.cn), with the approval RDD number as RDDA2021001939.
Patients
In this study, a total of 583 patients with FIGO stage IB∼IIA cervical cancer who had received radical resection at Sun Yat-sen University Cancer Center between February 2009 and December 2017 were enrolled as a cohort. Every patient’s postoperative histopathological type was reviewed according to the WHO criteria by two experienced gynecological pathologists. Routine blood examinations were performed before surgery. The study excluded patients who had hematological malignancies, other malignancies, autoimmune diseases, active infection, or inflammatory disease within the month before blood examinations, or who lost contact. The tumor stage of all cases was defined according to the FIGO 2018 cervical cancer criteria [6].
Data Collection
Clinical data, including clinicopathological parameters (such as age at diagnosis, height, weight, histopathological type, tumor grade, maximal tumor size, depth of invasion, preoperative neoadjuvant chemotherapy, postoperative adjuvant therapy, FIGO stage, and HPV infection status), survival time, and preoperative routine blood examination results (including absolute counts of leukocytes, lymphocytes and platelets, the levels of CRP and ALB) were collected retrospectively from the medical records. In addition, we also collected the postoperative adjuvant treatment including radiotherapy and chemotherapy.
Parameters Calculations
Venous blood was drawn from all patients within 1 week before surgery. The CAR, PLR, PNI and body mass index (BMI) were calculated using the following equations:
The depth of invasion was evaluated by two experienced gynecological pathologists. The invasion of outer one-third (≥2/3) of the cervical stroma was considered as a risk factor that increases the risk of pelvic recurrence [6].
Receiver operating characteristic (ROC) curves were generated for pre-treatment CAR, PLR, and PNI to determine the cut-off values that yielded optimal sensitivity and specificity. The upper right point of the ROC curve was selected, and the Youden index was calculated according to the sensitivity and specificity of each possible point in the statistical results. Then, the largest point was selected to determine the optimal cut-off value of the hematological index, such that the numerical variable could be transformed into a classified variable to analyze the statistical data.
HPV Testing
Every patient accepted high-risk type HPV test before surgery. Cervical cells sample was collected by the Digene Hybrid Capture 2 (HC2) HPV DNA Collection Device (QIAGEN, Germantown, MD, United States), which consisted of a cervical brush and a digene specimen transport medium. The DNA copy number of the high-risk type HPV was calculated. If the copy number was 0–1 pg/ml, it indicated that there was no HPV infection. When the copy number was greater than 1 pg/ml, it indicated a positive HPV infection.
Neoadjuvant and Adjuvant Therapy
Preoperative neoadjuvant chemotherapy was administered to inhibit some micrometastasis and distant metastasis and to improve the radical curability and safety of surgery. Patients whose tumor could not be removed completely in the beginning were given 2 cycles of cisplatin (70 mg/m2) and paclitaxel (175 mg/m2), every 3 weeks before surgery.
According to the FIGO 2018 and NCCN guidelines, patients with either positive surgical margins or lymph node metastases or parametrial spread, were offered postoperative radiotherapy with chemotherapy. For adenocarcinoma and adenosquamous carcinoma patients with two of four risk factors (deep stromal invasion, tumor size more than 3 cm, lymphovascular invasion, adenocarcinoma), and for squamous cell carcinoma patients with two of three risk factors (deep stromal invasion, tumor size more than 4 cm, lymphovascular invasion), postoperative radiotherapy was required. Among other patients, those with poorly differentiated grade and tumor size more than 2 cm, or highly maligant pathological type such as clear cell adenocarcinoma, neuroendocrine carcinoma, were given chemotherapy without radiotherapy. All other patients following radical hysterectomy did not need any adjuvant therapy [6, 26].
Follow-Up
After the initial treatment, follow-up assessments were performed once every 3 months for the first 2 years, once every 6 months for the next 3 years, and then once every year after 5 years. The main examinations included routine blood tests, tumor markers measurement, gynecological examinations, chest radiography, and computed tomography (CT) or magnetic resonance imaging (MRI) scans. In cases with abnormal findings and suspected tumor recurrence, lesion biopsy was performed to determine whether recurrence had occurred. As study endpoints, OS was defined as duration from the date of initial surgery to the date of death for any causes or the last follow-up (December 31st, 2020), and PFS was defined as the time interval from the date of surgery to progression or relapse.
Statistical Analysis
Comparison analyses of inflammatory indexes and clinicopathological variables between HPV-positive and HPV-negative groups were conducted using t-test, Pearson’s chi-squared (χ2) test and Fisher’s exact test. Comparison analyses of clinicopathological variables between high- and low-inflammatory index groups were performed as well.
The survival curves were plotted using the Kaplan–Meier method, and log-rank tests were carried out to assess survival differences between groups. Significant prognostic variables in the univariate analysis were selected for the multivariate Cox Regression model analysis to identify independent prognostic variables using the forward stepwise method. Analyses were performed using SPSS 23.0 software (IBM Corporation, Armonk, NY, United States) and GraphPad Prism 8 software (GraphPad Software, Inc., San Diego, CA, United States). A two sided p < 0.05 indicated that the difference was considered statistically significant.
Results
Patients’ Characteristics
In total, 583 patients with stage IB∼IIA cervical cancer were recruited in this study, of which 501 (85.93%) cases were HPV-positive and 82 (14.07%) cases were HPV-negative. The associations of characteristics between two groups were shown in Table 1. All patients had no lymph node metastasis. The median age at the time of prognosis was 48.88 ± 9.174 years, and the median follow-up time was 68.04 ± 26.32 months. The HPV-positive group had a higher proportion of squamous cell carcinoma type compared to HPV-negative group (χ2 = 35.962, p < 0.0001). The proportions of other characteristics were relatively balanced. During the follow-up period, a total of 42 patients experienced recurrence or progression, and 31 of them died.
TABLE 1. Comparison of clinical characteristics between patients with HPV-positive and HPV-negative cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
In this study, 109 HPV-positive cases and 24 HPV-negative cases received neoadjuvant chemotherapy before surgery. Patients with risk factors were required to accept radiotherapy or chemotherapy after surgery. In HPV-positive group, there were 151 cases without postoperative adjuvant therapy, 96 cases with chemotherapy, 111 cases with radiotherapy and 143 cases with chemotherapy and radiotherapy. In HPV-negative group, there were 28 cases without postoperative adjuvant therapy, 17 cases with chemotherapy, 12 cases with radiotherapy and 25 cases with chemotherapy and radiotherapy. We compared the prognosis of different subgroups and found that there was no influence on prognosis of cervical cancer patients no matter what kind of postoperative adjuvant therapy they received (Supplementary Figure S1).
Cut-Off Values of Inflammatory Indexes
The cut-off values of CAR, PNI, and PLR were determined using ROC curves (Supplementary Figure S2). The analyses identified CAR ≤ 0.0396 (area under the curve (AUC): 0.619, 66.7% sensitivity, 61.9% specificity), PLR ≤ 163.41 (AUC: 0.509, 33.3% sensitivity, 78.9% specificity), PNI ≤ 50.15 (AUC: 0.520, 66.7% sensitivity, 21.3% specificity), as the most accurate cut-off values for patients with cervical cancer.
Comparison Between Inflammatory Indexes and Clinicopathological Variables
Patients with different HPV infection statuses were divided into two groups according to the cut-off values of CAR, PNI, or PLR. The associations of clinical characteristics between CARhi and CARlo, PLRhi and PLRlo, PNIhi and PNIlo groups were analyzed using t-test, chi-squared (χ2) test and Fisher’s exact test in HPV-positive group and HPV-negative group, respectively.
We found that although there were no differences in age, FIGO stage, and pathological type among patients with HPV-positive cervical cancer. A higher CAR level (>0.0396) correlated significantly with larger tumor size (χ2 = 8.360, p = 0.004), higher receipt rate of neoadjuvant chemotherapy (χ2 = 6.350, p = 0.012) and nonstandard BMI (χ2 = 16.962, p < 0.0001) (Table 2). A higher level of PLR (>163.41) was associated with larger tumor size (χ2 = 4.086, p = 0.043) and lower PNI (χ2 = 49.013, p < 0.0001) (Table 3). While a higher level of PNI (>50.15) was associated with smaller tumor size (χ2 = 6.139, p = 0.013), lower receipt rate of neoadjuvant chemotherapy (χ2 = 4.190, p = 0.041) and lower PLR (χ2 = 49.013, p < 0.0001) (Table 4).
TABLE 2. Comparison of clinical characteristics between preoperative CARlo and CARhi groups in patients with HPV-positive cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 3. Comparison of clinical characteristics between preoperative PLRlo and PLRhi groups in patients with HPV-positive cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 4. Comparison of clinical characteristics between preoperative PNIlo and PNIhi groups in patients with HPV-positive cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
For HPV-negative group, the results showed that a higher CAR level was related to nonstandard BMI (χ2 = 6.786, p = 0.009) (Table 5), and there was no difference of clinicopathological variables between PLRhi and PLRlo groups (Table 6) as well as PNIhi and PNIlo groups (Table 7).
TABLE 5. Comparison of clinical characteristics between preoperative CARlo and CARhi groups in patients with HPV-negative cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 6. Comparison of clinical characteristics between preoperative PLRlo and PLRhi groups in patients with HPV-negative cervical cancer.
TABLE 7. Comparison of clinical characteristics between preoperative PNIlo and PNIhi groups in patients with HPV-negative cervical cancer.
Prognostic Roles of CAR, PLR, PNI in Patients With HPV-Positive and HPV-Negative Cervical Cancer
Kaplan–Meier analyses showed that there was no difference of prognosis between HPV-positive and HPV-negative groups (Supplementary Figure S3). Among 501 patients with HPV-positive cervical cancer, CARhi (p < 0.0001; p = 0.0009), PLRhi (p = 0.0021; p = 0.0108) had worse OS and PFS (Figures 1A–D), while PNIhi (p = 0.0013; p = 0.0403) had favorable OS and PFS (Figures 1E,F). For the HPV-negative group, none of the three indexes were related to prognosis (all p > 0.05) (Supplementary Figure S4).
FIGURE 1. The Kaplan-Meier curves of CAR for OS (A) and PFS (B), PLR for OS (C) and PFS (D), and PNI for OS (E) and PFS (F) in patients with HPV-positive cervical cancer.
For HPV-positive group, the multivariate analysis showed that the depth of invasion (HR: 3.651, 95% CI: 1.464–9.103, p = 0.005), the levels of PNI (HR: 0.341, 95% CI: 0.156–0.745, p = 0.007) and CAR (HR: 5.201, 95% CI: 2.080–13.004, p < 0.0001) were independent factors for OS (Table 8). In addition, the depth of invasion (HR: 2.478, 95% CI: 1.218–5.043, p = 0.012), the levels of PLR (HR: 1.991, 95% CI: 1.018–3.894, p = 0.044) and CAR (HR: 2.769, 95% CI: 1.406–5.455, p = 0.003) were independent predictors of PFS (Table 9). For the HPV-negative group, only the depth of invasion (HR: 9.192, 95% CI: 1.016–83.173, p = 0.048) was an independent prognostic factor of OS (Table 10), while none of clinicopathological parameters were independent prognostic indicators of PFS (Table 11).
TABLE 8. Univariate and multivariate Cox proportional hazards analyses of overall survival in patients with HPV-positive cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 9. Univariate and multivariate Cox proportional hazards analyses of progression free survival in patients with HPV-positive cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 10. Univariate and multivariate Cox proportional hazards analyses of overall survival in patients with HPV-negative cervical cancer. The bold values mean that the difference is considered statistically significant (p < 0.05).
TABLE 11. Univariate and multivariate Cox proportional hazards analyses of progression free survival in patients with HPV-negative cervical cancer.
All the above data suggested that for patients with HPV-positive FIGO stage IB∼IIA cervical cancer, the depth of invasion, the levels of PNI and CAR are independent predictors of OS, and the depth of invasion, the levels of PLR and CAR are independent predictors of poor PFS. For patients with HPV-negative cervical cancer, none of CAR, PNI and PLR is independent factor of prognosis.
Discussion
The immune system, which resists pathogenic microorganisms, repairs damage, and maintains stability of internal environment, mainly relies on normal autoimmunity reactions [27]. Some pathogens have been proven to promote tumors, such as cervical cancer (HPV), nasopharyngeal cancer (Epstein-Barr virus), liver cancer (Hepatitis B virus), and gastrointestinal cancer (Helicobacter pylori) [28, 29]. During the occurrence and development of malignant tumors, the inflammatory response plays an essential role [30, 31]. Inflammation is not only involved in all processes of tumor progression, but also affects treatment and prognosis [32, 33]. Crusz et al. believed that immune-cell infiltration of tumors can have a dual role. Both tumor and immune cells of solid tumors secrete tumor necrosis factor-α (TNF-α) which stimulates tumor cell growth survival, invasion, and metastasis, and inflammatory cell trafficking and neoangiogenesis [33]. Besides, tumor-associated macrophages (TAMs) degrade the extracellular matrix (ECM) and basement membrane by releasing a number of proteolytic enzymes, including matrix metalloproteinases (MMPs) and serine proteases, thus facilitating tumor invasion and metastasis [34]. Research has clarified that HPV E6/E7 mRNA decreased the expression of p53 and pRb, increased that of p16, activated the mammalian target of rapamycin (mTOR) signaling pathway, inhibited cell apoptosis, and induced cell proliferation [35, 36]. Studying tumors and the immune system as a whole is the current trend and direction in tumor research.
Previous studies have indicated that inflammation is one of the factors influencing the prognosis of patients with cancer [32, 37]. Our findings suggested that CAR, PLR and PNI levels have predictive effects on the prognosis of patients with HPV-positive early-stage cervical cancer. We noted that among women with FIGO 2018 IB∼IIA cervical cancer, survival was improved in those with lower levels of CAR or PLR, or higher level of PNI. There is an interaction between platelets and tumor cells. Tumor cells stimulate platelet activation through direct contact or the release of platelet-inducing factors, such as adenosine diphosphate (ADP). Platelets activate their surface receptors and secrete a variety of bioactivators that play an important role in tumor cell growth, metastasis, and angiogenesis [38]. An increased platelet counts was identified as an independent prognostic factor of poor survival in lung cancer [39]. CRP is a widely used and important acute-phase serum protein for monitoring infection in the clinic. Although an increased level of CRP might be nonspecific, some studies have found that patients with cancer have a higher CRP level than healthy people [40]. Malnutrition accounts for 20% of all cancer-related deaths [41]. Malnutrition and inflammation suppress the synthesis of serum ALB, which can reflect the nutritional status of patients, as well as the severity, progression, and prognosis of disease [42]. In gastrointestinal cancer, lymphocytes secrete cytokines, such as interferon gamma (IFN-γ) and TNF-α, thereby controlling tumor growth and improving the prognosis. A decline in the number and function of lymphocytes could weaken immunological surveillance and defense [43]. In addition to prognosis, the alteration of systemic inflammation and nutritional status may influence the response to immune checkpoint inhibitors (ICIs). In non-small cell lung cancer (NSCLC), CPR, ALB, PNI and NLR were reported to be associated with the response to ICIs [44–46]. Therefore, based on the above indicators, the balance between the immune status and tumor progression in patients with cancer can be better displayed.
In the present study, we proposed to evaluate the prognostic value of inflammatory indexes based on the patients’ HPV infection status. The same results were not observed in both HPV-positive and HPV-negative groups. Before our analyses, there were many studies that explored the relationships between inflammatory indexes and prognosis in cervical cancer, but none of them paid attention to the HPV infection status of the patients [47, 48]. The above results revealed that in patients with HPV-negative cervical cancer, the inflammatory indexes were not suitable as indicators of prognosis. In addition, our study included cervical cancer patients with stage IB∼IIA according to the FIGO 2018 guidelines, except for those with lymph node metastasis. These results identified low-cost, convenient, and effective preoperative prognostic factors for patients with early-stage cervical cancer.
There are some limitations of this study. First, this study is retrospective. Therefore, there might have been selection bias and analysis bias. However, a large sample size guarantees the sufficient statistical power and reduces the risk of bias in HPV-positive group. In this study, one of the weaknesses is the low number of HPV-negative cases. It is vital to expand the number of HPV-negative group to avoid bias in our future studies. Second, in the present study, there were differences in the pathological types between the HPV-positive and negative groups. Thus, to avoid these problems, it is crucial to carry out prospective researches.
In summary, we found that in patients with HPV-positive cervical cancer, the depth of invasion, the levels of CAR and PNI are independent predictors of OS, and the depth of invasion, the levels of PLR and CAR are independent predictors of PFS. In HPV-negative cases, three inflammation indexes had no prognostic value. Interestingly, when the analysis was limited to patients with negative lymph node metastasis, CAR, PLR and PNI still had significant prognostic value. Our research verified that clarifying the HPV infection status will be more accurate for the application of preoperative inflammatory parameters in the prognosis of cervical cancer.
Data Availability Statement
The original contributions presented in the study are publicly available. This data can be found here: Research Data Deposit (www.researchdata.org.cn), RDD number RDDA202101939.
Ethics Statement
The studies involving human participants were reviewed and approved by The Ethics Committee of the Sun Yat-sen University Cancer Center Institutional Review Board. Written informed consent for participation was not required for this study in accordance with the national legislation and the institutional requirements.
Author Contributions
Study conception and design: YJ and HG; Data collection and analysis: YJ, XZ, BP, and PL; Writing and revising of the manuscript: YJ and MZ. All authors have reviewed the manuscript and approved of its submission.
Funding
This work was supported by grants from the National Natural Science Foundation of China (Grant numbers 81672863, 81872434).
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Supplementary Material
The Supplementary Material for this article can be found online at: https://www.por-journal.com/articles/10.3389/pore.2021.1609946/full#supplementary-material
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Keywords: recurrence, survival, CAR, prognostic markers, UCC, HPV
Citation: Jiang Y, Gu H, Zheng X, Pan B, Liu P and Zheng M (2021) Pretreatment C-Reactive Protein/Albumin Ratio is Associated With Poor Survival in Patients With 2018 FIGO Stage IB-IIA HPV-Positive Cervical Cancer. Pathol. Oncol. Res. 27:1609946. doi: 10.3389/pore.2021.1609946
Received: 11 July 2021; Accepted: 30 November 2021;
Published: 21 December 2021.
Edited by:
Aniko Maraz, University of Szeged, HungaryCopyright © 2021 Jiang, Gu, Zheng, Pan, Liu and Zheng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Min Zheng, emhlbmdtaW5Ac3lzdWNjLm9yZy5jbg==
†These authors have contributed equally to this work