Background: Esophageal cancer is one of the most common malignant tumors, with early metastasis, highly malignant characteristics. Morbidity ranks 7th among all malignant tumors, and mortality ranks 6th. Esophageal adjuvant therapy can significantly improve overall survival in unresectable esophageal cancer patients. With the breakthrough and progress of immunotherapy, the possibility of curing esophageal cancer has greatly increased. Some clinical trials have reported that compared with traditional platinum-based chemotherapy , the use of programmed death 1 (PD-1) and programmed death ligand 1 (PD-L1) inhibitors alone can benefit patients and effectively prolong their overall survival. We compare the efficacy of single immunotherapy with traditional platinum-based chemotherapy in a systematic review and meta-analysis to provide a reliable basis for clinicians. Methods: We will search PubMed, Medline, Embase, Web of Science, Cancerlit, Google Scholar, and the Cochrane Central Register of Controlled Trials for related studies published before December 1, 2019 without language restrictions. Two review authors will search and assess relevant studies independently. Randomized controlled trials (RCTs) or quasi-RCTs, and prospective cohort studies will be included. We will perform subgroup analysis in sex, age, ethnicity, and tumor stage of esophageal cancer patients. Results: The results of this study will be published in a peer-reviewed journal. Conclusion: The results of this systematic review and meta-analysis will provide a basis for clinicians to formulate the best chemotherapy regimen for patients, as well as a research clue for clinical researchers in this field. The results of this study will expand the treatment options for esophageal patients, but due to the nature of the disease and intervention, large sample clinical trials are not abundant, so we will include some high-quality small sample trials, which may cause high heterogeneity. INPLASY registration number: INPLASY2020110012.
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