Survival curves of the resection and non-resection groups stratified by IM, VI, and LM (a–c). In patients with IM, VI, and LM, MSTs of resected and non-resected patients were 18.7 and 7.1 (p<0.001), 23.4 and 5.7 (p<0.001), and 12.8 and 5.5 months (p<0.001), respectively.