Published online Aug 15, 2023. doi: 10.4251/wjgo.v15.i8.1486
Peer-review started: February 10, 2023
First decision: May 19, 2023
Revised: May 28, 2023
Accepted: June 25, 2023
Article in press: June 25, 2023
Published online: August 15, 2023
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Hepatocellular carcinoma (HCC) is difficult to diagnose with poor therapeutic effect, high recurrence rate and has a low survival rate. The survival of patients with HCC is closely related to the stage of diagnosis. At present, no specific serolo
To identify risk factors associated with HCC and establish a risk prediction model based on clinical characteristics and liver-related indicators.
The clinical data of patients in the Affiliated Hospital of North Sichuan Medical College from 2016 to 2020 were collected, using a retrospective study method. The results of needle biopsy or surgical pathology were used as the grouping criteria for the experimental group and the control group in this study. Based on the time of admission, the cases were divided into training cohort (n = 1739) and validation cohort (n = 467). Using HCC as a dependent variable, the research indicators were incorporated into logistic univariate and multivariate analysis. An HCC risk prediction model, which was called NSMC-HCC model, was then established in training cohort and verified in validation cohort.
Logistic univariate analysis showed that, gender, age, alpha-fetoprotein, and protein induced by vitamin K absence or antagonist-II, gamma-glutamyl transferase, aspartate aminotransferase and hepatitis B surface antigen were risk factors for HCC, alanine aminotransferase, total bilirubin and total bile acid were protective factors for HCC. When the cut-off value of the NSMC-HCC model joint prediction was 0.22, the area under receiver operating characteristic curve (AUC) of NSMC-HCC model in HCC diagnosis was 0.960, with sensitivity 94.40% and specificity 95.35% in training cohort, and AUC was 0.966, with sensitivity 90.00% and specificity 94.20% in validation cohort. In early-stage HCC diagnosis, the AUC of NSMC-HCC model was 0.946, with sensitivity 85.93% and specificity 93.62% in training cohort, and AUC was 0.947, with sensitivity 89.10% and specificity 98.49% in validation cohort.
The newly NSMC-HCC model was an effective risk prediction model in HCC and early-stage HCC diagnosis.
Core Tip: This study identified the risk factors associated with hepatocellular carcinoma (HCC) and further established a risk prediction model based on the clinical characteristics and liver indicators. By evaluating in the training cohort and confirming with the validation cohort, we proved that the proposed model has good sensitivity and specificity in high-risk populations with HCC, with a high accuracy in early-stage HCC diagnosis. In addition, we recommend a risk prediction scale (low to very high risk). This will help clinicians to diagnose HCC earlier and thus improve the prognosis of patients.
- Citation: Liu ZJ, Xu Y, Wang WX, Guo B, Zhang GY, Luo GC, Wang Q. Development and application of hepatocellular carcinoma risk prediction model based on clinical characteristics and liver related indexes. World J Gastrointest Oncol 2023; 15(8): 1486-1496
- URL: https://www.wjgnet.com/1948-5204/full/v15/i8/1486.htm
- DOI: https://dx.doi.org/10.4251/wjgo.v15.i8.1486
Hepatocellular carcinoma (HCC), a common and highly malignant tumour globally, ranks fourth among the most common malignant tumours in China[1]. Approximately 86% of HCC is caused by hepatitis B virus (HBV) infection[2]. HCC is characterized by high malignancy and rapid progression. In developing countries, only 30% of patients with HCC are diagnosed at an early stage and thus receive effective treatment[3]. As such, early diagnosis of HCC is difficult, therapeutic effect and prognosis is poor, and recurrence rate is high. Early diagnosis and early treatment significantly improve prognosis and prolong survival among patients with HCC.
Serological markers and imaging are the most important methods for monitoring HCC in the early stages. In general, serology is the first choice for clinical detection as it is simple, repeatable, and cheap. Alpha-fetoprotein (AFP) is the most widely used tumour marker. However, AFP is negative in about one-third of patients, limiting the diagnosis of HCC[4]. Protein induced by vitamin K absence or antagonist-II (PIVKA-II) is an abnormal thrombin that lacks clotting activity, and is a commonly used diagnostic marker of HCC in clinics. Previous study show that the sensitivity and specificity of PIVKA-II in diagnosing HCC is higher than that of AFP[5]. However, the sensitivity of PIVKA-II with a single tumour diameter smaller than 2 cm is 30%-53%, while that of AFP is only 13%[6]. Thus, the tumour markers, PIVKA-II and AFP have limitations in diagnosing HCC.
As a unique method of diagnosis, combined diagnosis can make up for the shortcomings of indivi
The GALAD model was established in 2014, based on sex, age, and three tumour markers: AFP, AFP-L3%, and PIVKA-II. The AUC of this model in diagnosing HCC was 0.91, and the sensitivity and specificity were 68% and 95%, respectively[12]. Moreover, the ASAP model is based on sex, age, AFP, and PIVKA-II. The AUC of the ASAP model for diagnosis of HCC is 0.941, and the sensitivity and specificity are 88.3% and 85.1%, respectively. This model has a good diagnostic efficacy in Chinese patients with HCC secondary to HBV, even better than the GALAD model[13]. These two models have good sensitivities and specificities in diagnosing HCC; however, they do not include liver-related meta
Data of 2206 patients were collected from the Affiliated Hospital of North Sichuan Medical College between January 2016 and December 2020. Patients admitted from January 2016 to December 2019 were included in training cohort, which included 496 patients with HCC and 1243 patients with benign liver diseases. Patients admitted from January 2020 to December 2020 were included in the validation cohort, which included 156 patients with HCC and 311 patients with benign liver diseases.
The selection criteria of HCC group were: (1) Patients with HCC diagnosed for the first time in our hospital; (2) Patients with HCC diagnosed by pathological biopsy or intraoperative pathological biopsy; (3) Anti-tumour behaviours such as no radical operation, no transcatheter arterial chemoembolisation and radiotherapy, and chemotherapy; and (4) Patients with complete medical records. The diagnostic criteria of HCC followed the standard for diagnosis and treatment of primary liver cancer (2019 edition) issued by CSCO in 2020[14].
The selection criteria for the early HCC group were: (1) Stage I HCC diagnosed by pathology (liver puncture) biopsy or surgical pathology and in accordance with the Chinese staging of liver cancer programme: Single tumour, diameter ≤ 5 cm, no vascular invasion and extrahepatic metastasis, and liver function grade Child-Pugh A/B[15]; (2) No anti-tumour treatment; and (3) Complete clinical information and examination indicators.
The exclusion criteria of HCC group were: (1) Patients with HCC who were not diagnosed for the first time in our hospital; (2) Complicated with other serious diseases or conditions or a history of surgery, radiotherapy and chemo
Benign liver diseases included hepatic hemangioma, hepatic cyst, hepatic abscess, hepatic heman
Blood samples were collected from the patients enrolled in the study within three days after admission. Approximately 3-5 mL fasting venous blood was collected in heparin anticoagulant and anticoagulant-free serum tubes. After collection, samples were mixed, coagulated, and centrifuged at 3500 rpm for 5 min. The serum level of PIVKA-II was detected by chemiluminescence microparticle immunoassay (Archtect i1000, ABBOTT, United States). The serum level of AFP was detected by electrochemiluminescence assay (Cobas e602, Roche, Inc., Germany). The serum level of total bilirubin (TBIL) was detected by vanadate oxidation method (ADVIA-2400, SIEMENS, Germany). The serum levels of gamma-glutamyl transferase (GGT), alanine amino transferase (ALT) , and aspartate transaminase (AST) were detected by rate method (ADVIA-2400, SIEMENS, Germany). The serum level of total bile acid (TBA) was detected by enzyme cycle method (ADVIA-2400, SIEMENS, Germany). The serum level of albumin (ALB) was detected by albumin-bromocresol green method (ADVIA-2400, SIEMENS, Germany).
Descriptive statistics were used to summarise the characteristics of all participants. The metrological data were expressed by the median (interquartile interval), and each group was tested using normality and variance homogeneity tests before analysing. The differences between the two groups were compared using independent samples t-test. If the results were not normally distributed, the differences between groups were compared by nonparametric rank sum test (Mann-Whitney U test). The catego
Of the 2206 patients, 1739 were included in the training cohort to establish the risk prediction model and 467 were included in the validation cohort to evaluate the prediction effect of the model. The age of patients with HCC in the training cohort and validation cohort was significantly higher than that of patients without HCC (P < 0.001). Although, in terms of sex, men were dominant in both the training and validation cohorts, the sex composition did not vary significantly between the groups (P > 0.05). In the training and validation cohorts, the levels of tumour markers AFP and PIVKA-II were significantly different between patients with and without HCC. The serum levels of patients with HCC were significantly higher than those of patients without HCC (P < 0.001), as shown in Table 1.
Characteristic | Training cohort | Validation cohort | ||
HCC (n = 496) | Non-HCC (n = 1243) | HCC (n = 156) | Non-HCC (n = 311) | |
Age (yr) | 57.86 ± 11.89a | 53.84 ± 14.53 | 58.47 ± 11.87b | 54.33 ± 13.53 |
Gender | ||||
Male, n (%) | 411 (82.9)a | 759 (61.1) | 131 (84.0)b | 169 (54.3%) |
Female, n (%) | 85 (17.1)a | 484 (38.9) | 25 (16.0)b | 142 (45.7%) |
PIVKA-II, mAU/mL | 1321.03 (117.91-9792.97)a | 24.04 (18.21-37.02) | 1337.95 (92.76-11380.07)b | 22.69 (16.92-32.41) |
AFP, ng/mL | 178.65 (8.33-6474.00)a | 3.60 (1.80-11.75) | 145.45 (6.25-2439.10)b | 3.70 (1.90-8.75) |
TBIL, μmol/L | 21.20 (15.60-31.85)a | 29.80 (15.70-127.50) | 21.20 (14.43-32.73)b | 27.40 (15.45-94.05) |
GGT, IU/L | 130.00 (59.75-279.75)a | 78.20 (29.00-197.00) | 145.40 (60.75-272.75)b | 63.00 (25.00-168.35) |
AST, U/L | 61.10 (38.00-110.00)a | 56.00 (28.00-178.00) | 60.00 (37.00-102.83)b | 49.00 (25.00-147.80) |
ALT, U/L | 42.00 (26.00-70.00)a | 44.00 (21.00-210.85) | 43.00 (25.57-68.00)b | 37.00 (19.50-149.00) |
TBA, μmol/L | 11.10 (4.50-27.45)a | 18.80 (4.10-123.95) | 10.20 (4.27-22.10)b | 16.20 (4.00-97.45) |
ALB, g/L | 37.10 (32.30-41.40)a | 36.10 (30.00-42.20) | 37.75 (34.00-41.42)b | 36.80 (30.85-41.90) |
HBsAg | ||||
Positive, n (%) | 388 (78.2)a | 555 (44.7) | 123 (78.8)b | 131 (42.1) |
Negative, n (%) | 108 (21.8)a | 688 (55.3) | 33 (21.2)b | 180 (57.9) |
Child Pugh Class | ||||
Class A, n (%) | 317 (63.9)a | 583 (46.9) | 103 (66.0)b | 155 (49.8) |
Class B, n (%) | 151 (30.4)a | 430 (34.6) | 45 (28.8)b | 103 (33.1) |
Class C, n (%) | 28 (5.6)a | 230 (18.5) | 8 (5.1)b | 53 (17.0) |
For data conversion, logarithmic (lg) conversion was performed on all variables except sex, age, hepatitis B surface antigen (HBsAg), and Child-Pugh scores, as lg (AFP), lg (PIVKA-II), lg (TBIL), lg (GGT), lg (AST), lg (ALT), lg (TBA), and lg (ALB).
Taking HCC as the dependent variable and the above mentioned research indices as independent variables, the binary logistic regression analysis was carried out, where the binary independent variables were assigned as follows: Male = 1, female = 0; HBsAg positive = 1, HBsAg negative = 0; Child-Pugh Class A = 1, Child-Pugh Class B = 2, and Child-Pugh Class C = 3. Multivariate logistic regression analysis showed that sex, age, HBsAg, AFP, PIVKA-II, GGT, and AST were risk factors for HCC, while TBIL, ALT and TBA were protective factors for HCC (Figure 1).
Based on the multi-factor risk prediction model of HCC, the line diagram (NSMC-HCC model) established by the training cohort data was used to predict the risk of HCC (Figure 2). The nomogram was calculated as follows: ln (P/1-P) = -7.115 + 1.879 × lg (PIVKA-II) + 1.422 × lg (AFP) + 1.537 × HBsAg + 1.115 × lg (GGT) + 1.133 × lg (ALT) + 0.627 × age + 0.051 × sex - 0.840 × lg (TBA) - 1.464 × lg (ALT) - 2.836 × lg (TBIL).
In the training cohort, compared with 1243 patients with benign liver diseases, the AUC of AFP for HCC was 0.812, and the sensitivity and specificity were 49.19% and 93.00%, respectively. The AUC of PIVKA-II for HCC was 0.882, and the sensitivity and specificity were 63.91% and 94.93%, respectively. The AUC of AFP combined with PIVKA-II for HCC was 0.896, and the sensitivity and specificity were 69.35% and 95.82%, respectively. The AUC of AFP for early-stage HCC was 0.860, and the sensitivity and specificity were 51.06% and 97.49%, respectively. The AUC of PIVKA-II for early-stage HCC was 0.863, and the sensitivity and specificity were 40.43% and 96.98%, respectively. The AUC of AFP combined with PIVKA-II for early-stage HCC was 0.923, and the sensitivity and specificity were 63.83% and 96.98%, respectively. However, with the addition of Child Pugh classification for liver function comparison and HBsAg grouping comparison, the results may be more complete.
In the validation cohort, compared with 311 patients with benign liver diseases, the AUC of AFP for detection of HCC was 0.845, and the sensitivity and specificity were 52.56% and 91.00%, respectively. The AUC of PIVKA-II for detection of HCC was 0.878, and the sensitivity and specificity were 64.74% and 94.53%, respectively. The AUC of AFP combined with PIVKA-II for detection of HCC was 0.888, and the sensitivity and specificity were 67.95% and 95.17%, respectively. The AUC of AFP for early-stage HCC was 0.714, the sensitivity and specificity were 14.55% and 98.49%, respectively. The AUC of PIVKA-II for early-stage HCC was 0.868, and the sensitivity and specificity were 52.73% and 96.48%, respectively. The AUC of AFP combined with PIVKA-II for early-stage HCC was 0.896, and the sensitivity and specificity were 50.91% and 95.98%, respectively. The sensitivity of AFP alone diagnosis and combination diagnosis was much lower than that of the training cohort, which may be due to the fact that fewer cases of early-stage HCC were enrolled (Table 2).
Training cohort | Validation cohort | |||||||||
AUC (95%CI) | SEN (%) | SPE (%) | PPV (%) | NPV (%) | AUC (95%CI) | SEN (%) | SPE (%) | PPV (%) | NPV (%) | |
HCC | ||||||||||
AFP | 0.812 (0.788-0.815) | 49.19 | 93.00 | 42.21 | 94.63 | 0.845 (0.786-0.880) | 52.56 | 91.00 | 49.04 | 92.09 |
PIVKA-II | 0.882 (0.865-0.903) | 63.91 | 94.93 | 51.21 | 96.93 | 0.878 (0.839-0.916) | 64.74 | 94.53 | 57.35 | 95.93 |
AFP + PIVKA-II | 0.896 (0.877-0.915) | 69.35 | 95.82 | 55.51 | 97.65 | 0.888 (0.851-0.924) | 67.95 | 95.17 | 59.83 | 96.56 |
Early-stage HCC | ||||||||||
AFP | 0.860 (0.792-0.928) | 51.06 | 97.49 | 82.77 | 89.40 | 0.714 (0.642-0.787) | 14.55 | 98.49 | 72.70 | 80.66 |
PIVKA-II | 0.863 (0.790-0.936) | 40.43 | 96.98 | 75.97 | 87.33 | 0.868 (0.802-0.935) | 52.73 | 96.48 | 80.55 | 88.07 |
AFP + PIVKA-II | 0.923 (0.869-0.978) | 63.83 | 96.98 | 83.31 | 91.90 | 0.869 (0.804-0.933) | 50.91 | 95.98 | 77.78 | 87.61 |
In the training cohort, when the diagnostic threshold for predicting risk was set at 0.22, the AUC of NSMC-HCC model in HCC diagnosis was 0.960 (95%CI: 0.950-0.971) (Figure 3A), with a sensitivity of 94.40%, specificity of 95.35%, and accuracy of 94.67%. The AUC of NSMC-HCC model in early-stage HCC diagnosis was 0.946 (95%CI: 0.901-0.991) (Figure 3C), with a sensitivity of 85.93%, specificity of 93.62%, and accuracy of 87.40%.
The data of the validation cohort were used to verify the NSMC-HCC model. The results showed that the AUC of NSMC-HCC model in HCC diagnosed was 0.966 (95%CI: 0.945-0.986) (Figure 3B). There was no significant difference between training cohort and validation cohort (P > 0.05). When the diagnostic threshold for predicting risk is set at 0.22, the sensitivity, specificity, and accuracy of NSMC-HCC model in the validation cohort were 90.00%, 94.20%, and 93.58%, respectively. The AUC of NSMC-HCC model in early-stage HCC diagnosis was 0.947 (95%CI: 0.901-0.994) (Figure 3D), with a sensitivity of 89.10%, specificity of 98.49%, and accuracy of 96.46% (Table 3). The AUC of NSMC-HCC model in HCC and early-stage HCC diagnosis were all higher than that of AFP combined with PIVKA-II in training cohort and validation cohort (all P < 0.001).
Cut-off value | Training cohort | Validation cohort | |||||||||
AUC (95%CI) | SEN (%) | SPE (%) | PPV (%) | NPV (%) | AUC (95%CI) | SEN (%) | SPE (%) | PPV (%) | NPV (%) | ||
HCC | 0.22 | 0.960 (0.950-0.971) | 94.40 | 95.35 | 87.25 | 98.10 | 0.966 (0.945-0.986) | 90.00 | 94.20 | 89.87 | 95.47 |
Early HCC | 0.946 (0.901-0.991) | 85.93 | 93.62 | 61.11 | 98.28 | 0.947 (0.901-0.994) | 89.10 | 98.49 | 94.23 | 97.02 |
According to the data from the training and validation cohorts, we proposed a simple standard scale of risk prediction probability based on the NSMC-HCC model for clinicians to evaluate the risk level of HCC (Table 4). This mainly follows the principles: (1) The maximum risk prediction probability whose negative predictive value (NPV) ≥ 99.00% is defined as low risk; (2) The risk prediction probability between the minimum risk prediction probability whose NPV < 99.00% and cut-off is defined as medium risk; (3) The risk prediction probability between cut-off and the maximum risk prediction probability whose positive predictive value (PPV) < 99.00% is defined as high risk; and (4) The minimum risk prediction probability whose PPV ≥ 99.00% is defined as the highest risk (most likely HCC).
Risk level | Probability of risk | PPV (%) | NPV (%) |
Low risk | 0.000-0.007 | NA | ≥ 99.00 |
Moderate risk | 0.008-0.220 | NA | < 99.00 |
High risk | 0.221-0.940 | < 99.00 | NA |
Most likely HCC | 0.941-1.000 | ≥ 99.00 | NA |
The morbidity and mortality of HCC is ranked among the top five causes, globally[16]. Most patients are diagnosed at middle and advanced stages, and thus lose essential time for optimal treatment. The prognosis of patients with HCC largely depends on the stage of the diagnostic time. From 2012 to 2015, the 5-year survival rate of liver cancer in China is only 12.1%-18.0%[17]. In contrast, the prognosis of patients with early diagnosis is more than 70%. For example, Lim et al[18] analysed the clinical data of 100 patients with early-stage HCC and reported that the 5-year survival rate after surgery was as high as 90%. Therefore, appropriate early screening of high-risk HCC groups is crucial to improve the prognosis. In this study, a risk prediction model for HCC was established by combining sex, age, tumour markers of AFP and PIVKA-II, metabolic markers of TBIL, GGT, AST, ALT, TBA, and infection index HBsAg. By evaluating in the training cohort and confirming with the validation cohort, we proved that the proposed model has good sensitivity and specificity in high-risk populations with HCC, with a high accuracy in early-stage HCC diagnosis.
AFP and PIVKA-II are the two most widely used tumour markers in diagnosing HCC; however, their sensitivity and specificity for diagnosing HCC are not high, hence their limited utility. Combining markers can improve the sensitivity of diagnosis. A risk prediction model, ASAP model from 11 medical centres in China which included age, sex, AFP, and PIVKA-II, was used to predict the risk of HCC in patients with HBV infection. The model has a good clinical value for predicting HBV-HCC (AUC is 0.941). The diagnostic sensitivity and specificity are 85.3% and 90.4%, respectively[13]. However, other risk factors crucial for HCC development were not included in the model. Among the currently available prediction tools, the line chart model has high accuracy and good discrimination in terms of predicting results and is easy to use[19]. The nomogram proposed in this study contains ten comprehensive and easily available patient variables. The AUC in the training and validation cohort was 0.960 and 0.966, respectively. The diagnostic sensitivity and specificity for the training cohort were 94.40% and 95.35%, respectively, while that for the validation cohort was 90.00% and 94.20%, respectively. Those results showed high value of AUC, low value of standard error, and good diagnostic efficiency of the NSMC-HCC model in HCC diagnosis, which was better than AFP and PIVKA-II alone or combina
The metabolic markers included in this study were AST, ALT, TBIL, GGT, TBA, and ALB. Univariate analysis showed that GGT and AST were risk factors for HCC, while ALT, TBIL, and TBA were protec
Furthermore, we have quantified the possibility of HCC risk, and this can evaluate the risk of HCC according to the risk prediction probability. According to the risk stratification of HCC, abdominal ultrasound and serum AFP are recommended as routine screening, and multimodal liver magnetic resonance imaging and/or computed tomography are recommended for enhanced screening[23]. For low risk patients, we recommend routine screening once a year; for moderate risk patients, we recom
The newly established NSMC-HCC model can reliably predict the occurrence of HCC and has a strong accuracy for the early detection of HCC and the NSMC-HCC model performs well in the training and validation cohorts. This will contribute to the risk prediction and estimation of the high-risk population of HCC. Recent study has shown that the purpose of risk prediction models is not just to classify patients into simple high or low risk groups, but to view pathogenic risk as a continuum, interpreted in the clinical context of each patient, which can be constructed by grouping risk factors[25]. All the subjects were included in subgroup analysis (0 risk factor,1 risk factor, ≥ 2 risk factors), and the results of different risk groups were observed and predicted to make the risk prediction model more individualized and reduce unnecessary testing and treatment for healthy people.
Therefore, in the follow-up study, we stratified the risk factors and improved upon the shortcomings of this study, such as incomplete risk factors and lack of HBV DNA. The basic clinical information of the study participants was incomplete, including the family history and ethnic history of HCC patients, pathogenic factors of patients, and imaging indicators of patients’ tumours. As the sample size was small and the patients were from the same medical institution, a sampling bias may have occurred. All participants in this study were of Asian ethnicity, and our prediction model was applicable to most Asian populations due to the genetic and environmental differences between different ethnic groups.
In summary, our study identified the risk factors associated with HCC and further established a risk prediction model based on the clinical characteristics and liver indicators. The broader aim of this study is to aid early detection of HCC to improve the prognosis among patients. We believe that our study makes a significant contribution to the literature as it provides robust evidence of differences in sensi
Hepatocellular carcinoma (HCC) is the most common primary liver cancer, which currently faces difficulties in early diagnosis, high recurrence rate, and low overall survival rate. Early detection and diagnosis are main way to reduce the incidence rate and mortality of HCC.
Using logistic regression models to identify high-risk factors related to HCC, and combining clinical features and liver related indicators to establish a predictive model for HCC.
This study aims to establish a model that can predict HCC and can be applied in clinical practice.
Patients were divided into a modeling group and a validation group based on the results of puncture biopsy or surgical pathological diagnosis. HCC was used as the dependent variable, and the research indicators were included in logistic univariate and multivariate analysis to establish a HCC risk prediction model.
Logistic univariate analysis showed that, gender, age, alpha-fetoprotein (AFP), and protein induced by vitamin K absence or antagonist-II (PIVKA-II), gamma-glutamyl transferase (GGT), aspartate transaminase (AST), hepatitis B surface antigen (HBsAg) were risk factors for HCC, and in the training cohort and confirming with the validation cohort, the NSMC-HCC model has good sensitivity and specificity in high-risk populations with HCC, with a high accuracy in early-stage HCC diagnosis.
We have established a relatively effective HCC risk prediction model that includes gender, age, AFP, PIVKA-I, total bilirubin, GGT, AST, alanine amino transferase, total bile acid, and HBsAg, and this model has high accuracy in the diagnosis of early HCC.
This study is an observational study that included samples from the same medical institution, which may have sampling bias. Further validation of multicenter, large sample studies is needed in the future.
Provenance and peer review: Unsolicited article; Externally peer reviewed.
Peer-review model: Single blind
Specialty type: Oncology
Country/Territory of origin: China
Peer-review report’s scientific quality classification
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P-Reviewer: Cainap C, Romania; Costache RS, Romania; Gad EH, Egypt S-Editor: Wang JJ L-Editor: A P-Editor: Wang JJ
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