Protective Effect of Ganjang, a Traditional Fermented Soy Sauce, on Colitis-Associated Colorectal Cancer in Mice

Colorectal cancer (CRC) is one of the most prevalent causes of cancer-related fatalities globally, and its development is closely associated with dietary and microbial factors. The aim of this study was to investigate the potential of ganjang, a traditional fermented soy sauce, in alleviating colitis-associated colorectal cancer (CAC) in a mouse model induced by azoxymethane/dextran sulfate sodium (AOM/DSS). The bacterial composition of ganjang samples from different regions primarily included <i>Lactobacillus</i> spp. and <i>Bacillus</i> spp. Administration of ganjang to AOM/DSS-induced mice significantly improved CAC-related symptoms, including increased body weight, restored colon length, and reduced spleen size. Additionally, ganjang administration led to a decrease in tumor size and number, the modulation of apoptotic and proliferative markers, decreased inflammatory cytokine levels, and the restoration of the intestinal epithelial barrier. Furthermore, ganjang samples altered the gut microbiota composition by increasing the relative abundance of <i>Lactobacillus</i> spp. These findings suggest that ganjang has potential as a functional food for CRC prevention or mitigation, primarily through the modulation of CAC symptoms, tumor growth, inflammatory responses, intestinal epithelial barrier integrity, and gut microbiota composition.