Correlation Between PD-L1 Expression and Clinicopathological Features in Surgically Resected Lung Adenocarcinoma: a Case Series Analysis.

Immunotherapy improves the prognosis of patients with advanced lung cancer. The expression level of PD-L1 in lung cancer tissue is the most reliable marker for predicting the efficacy of immunotherapy. However, the relationship between PD-L1 expression level and clinicopathological characteristics in patients with lung adenocarcinoma is unclear. The paper aims to analyze the correlation between PD-L1 expression and clinicopathological features in surgically resected lung adenocarcinoma. Clinicopathological data of 100 patients with surgically resected lung adenocarcinoma admitted to the Department of Thoracic Surgery of our hospital from January 2021 to August 2021 were retrospectively analyzed. Immunohistochemistry showed that 36 patients had positive PD-L1 results in postoperative tumor tissues (incidence rate, 36.0%). The tumor-node-metastasis stage, tumor stage, node stage, degree of differentiation, smoking history, and intravascular cancer embolus were statistically different between the two groups (P < 0.05). Multivariate logistic regression analysis showed that postoperative pathological stages above stage II, T3-4, N1-2, poorly differentiated tumors, and positive intravascular cancer embolus were independent factors for PD-L1 positive in lung adenocarcinoma tissue. Therefore, these patients require more attention in the clinic to increase the efficiency of immunotherapy. [ABSTRACT FROM AUTHOR]