Abstract
OBJECTIVE: To compare the efficacy and complications of different neoadjuvant to determine the optimal regimens for nonsmall cell lung cancer (NSCLC) patients. METHODS: A systematic search of the Web of Science, and PubMed databases was conducted through June 3, 2021, reporting a comparison of chemotherapy, chemoradiotherapy, and immunotherapy. RESULTS: Of 3462 studies, 25 were considered for evidence synthesis. 1035 patients who received chemotherapy or radiotherapy before surgery did not prolong the overall survival (OS) compared with 1038 patients who received surgery alone (hazard ratio [HR] 1.13, 95% CI 1·00-1·28, P = 0·05). 1192 patients received chemoradiotherapy and 864 patients received chemotherapy or radiotherapy; chemoradiotherapy prolonged the OS compared with chemotherapy (HR 0.52, 95% CI 0·29 to 0.95, P = .03). Compared with 110 patients who received other therapy, 93 patients who received immunotherapy had prolonged the OS (HR 1.56, 95% CI 1·08-2·25, P = .02). Chemoradiotherapy increased the pathological response rate (HR 1.68, 95% CI 1·33-2·12, P < .0001), and grade 3 and 4 adverse effects were not increased (HR 5.90, 95% CI 0.88 to 39.60, P = .007). Immunotherapy increased the pathological response (HR 2.79, 95% CI 1·71-4·54, P < .0001), with no significant effects on grades 3 and 4 adverse(HR 0.71, 95% CI 0·19-2·64, P = .61). CONCLUSION: Our data showed that chemotherapy may prolong OS and PFS, but not statistically significant; however, the combination of chemotherapy and radiation did show an advantage, and immunotherapy may be also the choice for neoadjuvant therapy.