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Determination of Survival of Gastric Cancer Patients With Distant Lymph Node Metastasis Using Prealbumin Level and Prothrombin Time: Contour Plots Based on Random Survival Forest Algorithm on High-Dimensionality Clinical and Laboratory Datasets

  • Zhang, Cheng (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Xie, Minmin (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Zhang, Yi (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Zhang, Xiaopeng (Department of Noncommunicable Diseases and Health Education, Hefei Center for Disease Prevention and Control) ;
  • Feng, Chong (Department of Noncommunicable Diseases and Health Education, Hefei Center for Disease Prevention and Control) ;
  • Wu, Zhijun (Department of Oncology, Ma'anshan Municipal People's Hospital) ;
  • Feng, Ying (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Yang, Yahui (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Xu, Hui (Department of Oncology, The First Affiliated Hospital of Anhui Medical University) ;
  • Ma, Tai (Department of Oncology, The First Affiliated Hospital of Anhui Medical University)
  • Received : 2022.01.29
  • Accepted : 2022.03.17
  • Published : 2022.04.30

Abstract

Purpose: This study aimed to identify prognostic factors for patients with distant lymph node-involved gastric cancer (GC) using a machine learning algorithm, a method that offers considerable advantages and new prospects for high-dimensional biomedical data exploration. Materials and Methods: This study employed 79 features of clinical pathology, laboratory tests, and therapeutic details from 289 GC patients whose distant lymphadenopathy was presented as the first episode of recurrence or metastasis. Outcomes were measured as any-cause death events and survival months after distant lymph node metastasis. A prediction model was built based on possible outcome predictors using a random survival forest algorithm and confirmed by 5×5 nested cross-validation. The effects of single variables were interpreted using partial dependence plots. A contour plot was used to visually represent survival prediction based on 2 predictive features. Results: The median survival time of patients with GC with distant nodal metastasis was 9.2 months. The optimal model incorporated the prealbumin level and the prothrombin time (PT), and yielded a prediction error of 0.353. The inclusion of other variables resulted in poorer model performance. Patients with higher serum prealbumin levels or shorter PTs had a significantly better prognosis. The predicted one-year survival rate was stratified and illustrated as a contour plot based on the combined effect the prealbumin level and the PT. Conclusions: Machine learning is useful for identifying the important determinants of cancer survival using high-dimensional datasets. The prealbumin level and the PT on distant lymph node metastasis are the 2 most crucial factors in predicting the subsequent survival time of advanced GC.

Keywords

Acknowledgement

The authors gratefully acknowledge Mr. Zhenhui He for his help in data electronization.

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