CCL2 and laryngotracheoesophageal cleft: Several chemoattractants that could direct metastasis of LC include hepatocyte growth factor/scatter factor (HGF/SF) [3], the α-chemokine stromal-derived factor 1 (SDF-1) [4], monocyte chemoattractant protein 1 (MCP1) [5], and chemokine (C-C motif) ligand 19 (CCL19) [6].