Kaplan–Meier survival analysis for the largest single myxoid stroma area in Margin 1 ACP, total myxoid stroma area Margin 2, and manual DR Assessment for the training and test sets. (a) Largest single myxoid stroma area in Margin 1 ACP for the training set, (b) largest single myxoid stroma area in Margin 1 ACP for the test set, (c) total myxoid stroma area Margin 2 for the training set, (d) total myxoid stroma area Margin 2 for the test set, (e) manual DR Assessment for the training set, and (f) manual DR Assessment for the test set. p values from KM analysis. HR and CI from univariate Cox regression analysis.