IL6 and breast cancer: The study by Chavey C et al., get that negative ER/PR breast cancer group obtaining IL-6, IL-8, G-CSF, IFN-γ, MCP-1 and MIP-1β, IL-2, IL-6, IL-8, IL10, IFN-γ, MCP-1, MIP-1β, TNF-α is overexpressed (12).