Abstract

Objective: Rapid technological advances in the last century and the large amount of information have made it difficult to analyze a large number of independent variables. In such circumstances, the existence of interactions of different degrees in the model is expected, in this case, the Cox model cannot be useful and the nonparametric method of random survival forest can be a useful alternative. This study compares the prediction error of random survival forest with Cox and Weibull models in predicting the time to the first recurrence in patients with epithelial ovarian cancer. Method: In this retrospective study, the records of patients with epithelial ovarian cancer who referred to Imam Hossein Hospital in Tehran from 2007 to 2018 were used. To investigate the factors affecting the first recurrence of these patients, RSF was fitted to the data. Finally, prediction error of Cox, Weibull and RSF were compared using C-Index and Brier score. Results: Brier score was calculated 0.16 for RSF, and 0.24 for Cox, also C-Index was calculated 0.34 for RSF and 0.42 for Cox. Brier score was calculated 0.092 for Cox and 0.089 for Weibull, so the prediction error of RSF was lower than both Cox and Weibull models. Conclusion: Random survival forest with a suitable fit on many variables and without the need for a special default with a prediction error less than the Weibull and Cox methods can predict the response variable when confronted with high-dimensional data. © 2020 Tehran University of Medical Sciences.