F3 and cancer: For example, B. xylanisolvens DSM 23964 has been shown to promote the maturation of natural antibodies against various cancers in humans.178 Another commensal strain, B. ovatus ELH-B2, has shown promise as a vaccine candidate for the development of a Thomsen-Friedenreich antigen (TFα)-specific anti-tumor vaccine.179 In a nutshell the properties of cancer prevention and immunotherapy among these organisms could be related to the type of strains used and their functional capacities.