RBM4 and neoplasm: Aiming at verifying the influence on tumor growth exerted by the two isoforms of RBM4, nude mice [BALB/C (nu/nu), female, 4–6 weeks old, n = 3 for every group] were enrolled to receive vector, RBM4-FL and RBM4-S overexpressing MDA-MB-231 cells (2 × 106 cells) through subcutaneous injection in equal number.