Clinicopathological Features and Prognosis of Lung Adenocarcinoma Patients With K-RAS Gene Mutation.

K-RAS mutant lung adenocarcinoma is a malignant tumor with high invasiveness and high mortality. The degree of tumor differentiation, vascular invasion, distant organ metastasis, Ki-67 index, deletion mutation of exon 19 in EGFR, and high expression of PD-L1 (≥50%) in patients with K-RAS mutation lung adenocarcinoma can affect the overall survival time of patients. The high expression of PD-L1 (≥50%) is an independent risk factor affecting the prognosis (survival time).