Fig. 3

Selection of radiomics features after treatment via the LASSO Cox regression model. Tuning parameter (λ) selection in this model used tenfold cross-validation via the minimum criteria. A The C-index was plotted versus log(λ). Dotted vertical lines were drawn at the optimal values by using the minimum criteria and the 1 standard error of the minimum criteria (the 1-SE criteria), and the line on the right with λ value of 0.1087473 was chosen according to tenfold cross-validation. B LASSO coefficient profiles of the 299 radiomics features. A coefficient profile plot was generated versus value of log (λ). Two vertical lines were drawn at the value selected using tenfold cross-validation, where optimal λ pointed to 9 nonzero coefficients