On another note, our investigation revealed that several cytokines, including Interleukin-17, Interleukin-18, Cutaneous T-cell attracting chemokine, TNF-related apoptosis-inducing ligand, and tumor necrosis factor-alpha, did not exhibit a direct causal relationship with the onset of endometriosis (P > .05). This evidence concerns the gene CCL27 and endometriosis.