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The evaluation of the nomogram to predict the prognosis of BCBM. The ROC curve in the training cohort (A) and the validation cohort (B) in 1, 3, and 5 years. The C-index is represented by the area under the curve. The calibration curve in the training cohort (C–E) and the validation cohort (F–H) in 1, 3, and 5 years. The C-index if represented by the area under the curve. The closer the curve is to the dashed line with a slope of 45°, the higher the calibration of the nomogram.
