LBP was negatively associated with the relative abundances of genera lower in Tumor mice (Lactobacillus, Enterorhabdus, Erysipelotrichaceae, and Ruminoclostridium), but positively associated with parameters higher in Tumor mice (Bacteroides, brain Il-1β, spleen mass, and spleen cytokines IL-6, CXCL1, and MCP1). The gene discussed is CCL2; the disease is neoplasm.