For example, findings suggested that Lactobacillus acidophilus (L. acidophilus) can act as a putative immunostimulator, increasing the production of interferon gamma (IFN-γ) and decreasing interleukin 4 (IL-4) cytokine in the splenocytes of BALB/c mice bearing BC (Imani Fooladi et al., 2015). Here, IL4 is linked to breast cancer.