Fig. 2

Univariate survival analysis. The upper two plots display the Kaplan-Meier curves for overall (panel a) and cancer-specific survival (panel b) in cM0 patients with and without lymph node metastases (P < 0.001). Panel (c) and (d) display the Kaplan-Meier curves in the overall cohort comparing patients with non-metastatic and with metastatic GIST who did and did not undergo primary tumour surgery (P < 0.001 for all comparisons). Panel (e) and (f) display the Kaplan-Meier curves for non-metastatic GIST patients according to different primary tumour sizes (<5 cm vs. 5 to 9.9 cm: P = 0.360 for overall survival, all other comparisons: P < 0.001). Numbers of patients at risk are given below the x-axis