Extrapulmonary metastases impact survival outcomes of thermal ablation for colorectal lung oligometastases: A multicenter study

Figure 2 Kaplan-Meier survival curves for progression-free survival stratified by tumor burden and extrapulmonary metastasis patterns. A: Tumor number was significantly associated with shorter progression-free survival (PFS). Compared to patients with a single tumor, those with 2, 3, and 4 tumors showed progressively increased risks of disease progression, with hazard ratios (HRs) of 2.235, 2.723, and 4.117, respectively; B: Presence and site of extrapulmonary metastases adversely impacted PFS. Patients with liver (HR = 1.449), bone (HR = 1.256), abdominal cavity (HR = 1.864), pelvic cavity (HR = 1.546), and other extrapulmonary metastases (HR = 2.730) had a higher risk of progression compared to those without extrapulmonary disease. A higher hazard ratio reflects a greater risk of progression.