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Kaplan-Meier法估计疾病分期（A）、化疗敏感性（B）及SPHK1的表达（C）与患者生存时间的关系。LD：局限期；ED：广泛期。
The relationship of survival time with disease stage (A), chemosensitivity (B) and expression of SPHK1 (C) by Kaplan-Meier assay. LD: Limited disease; ED: Extensive-stage disease.
