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Escherichia coli Nissle 1917 (EcN) is non-pathogenic probiotic bacteria. Previous studies have indicated that EcN can accumulate and proliferate selectively in solid tumours in BALB/c mouse models. In this study, EcN was engineered to express human interleukin 2 (hIL-2), which is known to enhance immune responses to tumours by activating a variety of immune cells. IL-2 expressed by EcN was proven to activate PBMCs in vitro. Compared to control EcN, intraperitoneally injected EcN expressingdoi:10.21203/rs.3.rs-27294/v2 fatcat:mxn2obpvrfbenelpr2y7kj4gtm