RGS1 and non-small cell lung carcinoma: Elevated blood RGS1 was related to lymph node metastasis (P = 0.001), higher tumour‐nodes‐metastasis stage (P = 0.004), neoadjuvant chemotherapy administration (P = 0.044), shortened disease‐free survival (DFS) (P = 0.008) and overall survival (OS) (P = 0.013) in NSCLC patients.