CXCL8 and breast cancer: For example, N-3-oxo-dodecanoyl-homoserine lactone, a quorum sensing molecule secreted by Ps.aeruginosa, induces apoptosis in several breast cancer cell lines and enhances the production of interleukins (IL-6, IL-8) in bronchial epithelial cells (Li et al. 2004; Mayer et al. 2011; Smith et al. 2001).