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Establishment of the prognostic score in pancreatic ductal carcinoma (PDAC). A. Cross-validation for turning parameter selection in the LASSO Cox regression model. λ is the turning parameter. The partial likelihood deviance is plotted in log(λ), in which vertical lines are shown at the optimal values by minimum criteria and 1-SE criteria. B. Coefficient profiles of 16 identified genes in the LASSO Cox regression model. C. Formula of the prognostic score.
