No differences in OS were observed based on the expression of the MMR system based on factors such as sex (only males presented loss of expression, p = 0.595), histology (adenocarcinoma group, p = 0.359, and epidermoid group, p = 0.271) or PD-L1 positivity/negativity (PD-L1 negative group, p = 0.744, and positive, p = 0.641). This evidence concerns the gene CD274 and adenocarcinoma.