Lymphoepithelioma-like carcinoma (LELC) may benefit from immunocheckpoint inhibitor therapy. Although target antibody drugs for PD-1 and PD-L1 have achieved good results in immunotherapy of many malignant tumors, there is still a lack of corresponding clinical research reports on whether LELC treatment can benefit. Therefore, this study intends to adopt the basket research model , to explore the application of anti-procedural death receptor 1 (PD-1) monoclonal antibody in patients with advanced LELC after the failure of first-line standard treatment . Further explore the relationship between tumor and body immunity, tumor microenvironment and curative effect, and find stable biomarkers, so as to screen out the superior population of tumor immunotherapy.