To determine whether LINC00173/RAB1B promotes NPC progression by facilitating the secretion of PA2G4 and SDF4 proteins, we cotransfected LINC00173 overexpression plasmid with PA2G4 or SDF4 shRNA plasmid into NPC cells for the proliferation and invasion assays (Fig. S4). This evidence concerns the gene SDF4 and nasopharyngeal carcinoma.