Figure 2. Nomograms and calibration curves for 6-month, 1-year, 3-year survival rates of NSCLC patients with brain metastases. (A) Survival nomogram (B) calibration curve for 6-month survival rate, (C) 1-year, (D) and 3-year survival rates. To use the nomogram, individual patient data are located on each variable axis, and a line is drawn upward to determine the score received for each potential variable value. The sum of these scores is located on the Total Points axis, and a line is drawn downward to the survival rate axes to discern the likelihood of 6-month, 1- or 3-year survival. The calibration curves were plotted for the primary cohort, in which the nomogram-predicted probability of overall survival is plotted on the X-axis, and real overall survival is plotted on the y-axis. More overlap between the blue lines and dotted lines show the good predictive ability of the nomogram.