Fig. 4

Kaplan-Meier curves for overall survival of patients in the training set classified by clinical features. a, age; b, pharmaceutical therapy. All patients in the training set are divided by age or pharmaceutical therapy into two subgroups, respectively. The patients younger than or equal to 60 years have significantly longer overall survival time than the patients older than 60 years (p = 3.205 × 10⁻²). Markedly better survival is observed in the patients with pharmaceutical therapy compared to the patients without pharmaceutical therapy (p = 3.239 × 10⁻⁵)