Fig. 3

Nomogram for predicting the probability of LNM in small invasive lung adenocarcinoma. SA, serum amyloid; CA125, carcinoma antigen 125; CK 5/6, Cytokeratin 5/6. As shown in this nomogram, there are 9 axes, and axes 2–7 represent the six variables in the prediction model. By drawing a line perpendicular to the highest point axis, the estimated score for each risk factor can be calculated and can be further summed to obtain a total score. The total score axis is then used to predict the probability of developing lymph node metastasis in invasive lung adenocarcinoma, which in turn can further guide the surgical approach