The clusters are primarily divided into ten groups: The following terms are key to understanding the current state of cancer immunotherapy research: #0 cancer immunotherapy, #1 abscopal effect, #2 immune checkpoint inhibitors, #3 pan-cancer, #4 tyrosine kinase inhibitors, #5 KRAS, #6 small cell lung cancer, #7 PD-L1 monoclonal antibodies, #8 gut microbiota, #9 hyperprogressive disease, #10 EMT, and others. Here, CD274 is linked to small cell lung carcinoma.