sentences:  TLR4 expression levels were the highest among TLRs in human breast cancer cell line MDA-MB-231 and TLR4 knockdown resulted in decreased proliferation and decreased IL-6 and IL-8 levels.On the other hand, TLR4 signaling in immune and inflammatory cells of tumor microenvironment may lead to production of proinflammatory cytokines (TNF, IL-1β, IL-6, IL-18, etc.