Efficacy of natural killer cell activity as a biomarker for predicting immunotherapy response in non-small cell lung cancer.

SIGNIFICANT FINDINGS OF THE STUDY: The response to immunotherapy was significantly better in patients with high baseline NK cell activity, and there was a significant correlation between baseline NK cell activity and PFS. What this study adds This study demonstrates the efficacy of baseline NK cell activity from peripheral blood as a biomarker for predicting immunotherapy response.