The purpose of this study is to evaluate the safety and effectiveness of the investigational drug V940 in combination with pembrolizumab for preventing relapse in non-small cell lung cancer. V940 is not yet approved by the U.S. Food and Drug Administration (FDA), which means it is still under investigation and has not been authorized for general use. Pembrolizumab, however, is an FDA-approved drug commonly used in cancer treatment. This study aims to determine how well V940 and pembrolizumab work together compared to a placebo combined with pembrolizumab. Additionally, it will assess the...