[This corrects the article DOI: 10.3389/fimmu.2021.672271.].
Keywords: PD-1 inhibitor; carcinoembryonic antigen; combination therapy; neuron-specific enolase; neutrophil-to-lymphocyte ratio; non-small cell lung cancer.
Copyright © 2021 Chen, Wen, Xia, Du, Wu, Pan, Zhu and Shen.