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Construction of the risk signature in the training set. (a) Univariate Cox regression of OS for 19 PRGs with p < 0.05. (b) LASSO coefficient distribution of 19 PRGs. (c) LASSO model was adjusted based on the minimum criteria (regularization parameter λ). (d) Multivariate Cox regression analysis revealed 7 PRGs as independent prognostic factors for EC patients.
