CXCL8 and endometriosis: SASP gene products identified by RNAseq include many inflammatory biomarkers that have been historically analyzed in endometriosis, including IL-1β, IL-6 [29], IL-8 [30], CCL5 [31], TNF-α [32], CCL2 [33], MMP3 [34], HMGB1 [35], p16, and p21 [36, 37].