Fig. 4.

The homogeneous and heterogeneous risk factors for the incidence and survival outcome of BM patients in NSCLC. The left circle was the risk factors for the incidence of BM patients. The right circle was the risk factors for the prognosis factors of BM patients’ OS and CSS. The intersection of two circles meant the homogeneous risk factors including male, higher T stage, lymph node involvement, poor differentiation grade, brain metastases, and liver metastases. OS overall survival, CSS cancer-specific survival, BM bone metastases, SCC squamous cell carcinoma, NSCLC non-small cell lung cancer