A support vector machine based semiparametric mixture cure model
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The mixture cure model is an extension of standard survival models to analyze survival data with a cured fraction. Many developments in recent years focus on the latency part of the model to allow more flexible modeling strategies for the distribution of uncured subjects, and fewer studies focus on the incidence part to model the probability of being uncured/cured. We propose a new mixture cure model that employs the support vector machine (SVM) to model the covariate effects in the incidence part of the cure model. The new model inherits the features of the SVM to provide a flexible model to assess the effects of covariates on the incidence. Unlike the existing nonparametric approaches for the incidence part, the SVM method also allows for potentially high-dimensional covariates in the incidence part. Semiparametric models are also allowed in the latency part of the proposed model. We develop an estimation method to estimate the cure model and conduct a simulation study to show that the proposed model outperforms existing cure models, particularly in incidence estimation. An illustrative example using data from leukemia patients is given.
KeywordsCensored survival time Cure model Support vector machine EM algorithm Multiple imputation
The first and the last authors gratefully acknowledge the financial support from China Scholarship Council. The first author’s work was partially supported by Liaoning Social Science Planning Fund (L19CTJ001). The second author’s work was partially supported by a research grant from the Natural Sciences and Engineering Research Council of Canada. The last author’s work was also supported by the Fundamental Research Funds for the Central Universities (DUT19RC(3)042).
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Conflict of interest
The authors declare that there is no conflict of interests regarding the publication of this paper.
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