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The human rhomboid family-1 gene (RHBDF1) is an oncogene in breast and head and neck squamous cancers. Here, we show that RHBDF1 plays a significant role in colorectal cancer (CRC) formation and that the RHBDF1 expression level is higher in CRC than in corresponding normal tissues. Moreover, RHBDF1 promotes cell proliferation, invasion and migration in vitro. Furthermore, through overexpression and silencing of RHBDF1 and the mediator complex, our study demonstrates that RHBDF1 may positively regulate adenomatous polyposis coli (APC) in the Wnt/β-catenin signalling pathway to increase the expression levels of MMP-14 and Twist, which act as important epithelial-to-mesenchymal transition (EMT) stimulating factors. Additionally, RHBDF1 may regulate c-myc and CyclinD1 expression to influence cell proliferation. Finally, RHBDF1 overexpression and silencing influence CRC growth in BALB/c nude mice. In summary, our findings demonstrate that the regulatory effects of RHBDF1 on EMT and on cell proliferation are partially attributable to the Wnt/β-catenin signalling pathway.This is the first study to supply the relationship between RHBDF1 and EMT in colorectal cancer cells.RHBDF1 promotes cell proliferation,invasion and migration in colorectal cancer cells.RHBDF1 contributes to CRC tumorigenesis in nude mice models.RHBDF1 induces the EMT through downstream target genes in the Wnt/ β-catenin signalling pathway.RHBDF1 regulates APC expression to stimulate Wnt/ β-catenin signalling pathway in colorectal cancer cells.