A specific SW1990 cell line (SW1990-LNC-KD) with the stable knock down of lncRNA ELFN1-AS1 and a scramble control SW1990 cell line were constructed with lnc-small hairpin RNA (shRNA) or a scramble control (see Table S1) cloned into the pLV3 (H1/GFP & Puro) vector (see Figure S1) and transfected into 293T cells (Shanghai GenePharma China). Supernatants were collected after 72 h incubation and used for the transfection (24 h incubation before transfection) of the SW1990s (12 (link)). SW1990 cells containing the lnc-shRNA were screened by media containing 5 µg/mL puromycin (Sigma, St. Louis, MO, USA), and used for the Xenograft tumor growth experiments (13 (link)).