RESEARCH

Evaluation of the information content of a new diagnostic method based on an artificial neural network to determine the stage of liver fibrosis in patients with chronic viral hepatitis C

Authors: V.V. Tsvetkov, I.I. Tokin, A.Yu. Kovelenov, S.A. Pozdnyakova.

Aim. To evaluate the informative value of the new diagnostic method "FP Test" version 1.0 to determine the 3-4 stage of liver fibrosis in patients with chronic viral hepatitis C.

Materials and methods. A new diagnostic method "FP Test" is developed on the basis of an artificial neural network using deep learning technologies. To form the training and test samples, 809 patients with chronic viral hepatitis C were included in the study. 291 patients were randomly selected in the training sample and 76 patients in the test sample. As a standard method for diagnosing the stage of liver fibrosis according to the Metavir scale, all patients in the test sample underwent a liver biopsy. Liver fibrosis of stage 0–2 was detected in 51.32% of patients in the test sample, liver fibrosis of stage 3-4 was found in 48.68% of patients. To conduct a comparative assessment of the information content of minimally invasive tests, the APRI and FIB – 4 indices were calculated.

Results. The accuracy of the FP Test version 1.0 method for diagnosing stage 3-4 liver fibrosis was 78.95%, sensitivity - 70.27%, specificity - 87.18%. The informative indices of calculated indices for detecting liver fibrosis of stages 3-4 were: APRI (accuracy - 68.42%, sensitivity - 54.05%, specificity - 82.05%), FIB – 4 (accuracy - 75.00%, sensitivity - 67.58%, specificity - 82.05%). The values ​​of the area under the ROC – curve for the classification of patients depending on the presence or absence of stage 3–4 liver fibrosis were: “FP Test” version 1.0 (AUC = 0.77), APRI (AUC = 0.77), FIB – 4 ( AUC = 0.81).

Conclusion. The new diagnostic method "FP Test" is a simple, affordable and informative test for determining stage 3-4 liver fibrosis in patients with chronic viral hepatitis C.



Evaluation of the information content of the new diagnostic method "FP Test" to determine the degree of hepatitis activity in patients with chronic HCV infection

Authors: V.V. Tsvetkov, I.I. Tokin, A.Yu. Kovelenov, S.A. Pozdnyakova

Aim. To evaluate the informative value of the new diagnostic method “FP Test” version 1.0 to determine moderate / severe hepatitis activity in patients with chronic HCV infection.

Materials and methods. The study included 304 patients with chronic HCV infection. 184 patients were randomly selected into the training sample, 120 patients into the test sample. As a standard method for diagnosing hepatitis activity, a puncture biopsy of the liver was performed in all patients with the calculation of the histological activity index according to the Knodell scale. Minimum / low degree of hepatitis activity (HAI 0–8 points) was detected in 46.38% of patients, moderate / severe hepatitis activity (HAI 9–18 points) in 53.62% of patients.

Results. The accuracy of the FP Test version 1.0 method for diagnosing moderate / severe hepatitis activity was 79.17%, sensitivity - 78.46%, specificity - 80.00%. The values ​​of the area under the ROC – curve for classifying patients depending on the presence or absence of moderate / severe hepatitis activity were: “FP Test” version 1.0 (AUC = 0.84, cut-off value = 0.52), determination of ALT level ( AUC = 0.74, cut-off value = 61.40 U / L), determination of AST level (AUC = 0.76, cut-off value = 39.00 U / L).

Conclusion. The new diagnostic method "FP Test" is a simple, affordable and informative test to determine moderate / severe hepatitis activity in patients with chronic HCV infection.

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The results of the study should be evaluated by a specialist doctor taking into account other results of the clinical and laboratory examination of the patient.