PTBP2 and gastric cancer: Conversely, in gastric cancer, the expression of CELF2, along with BAG2 (BAG Cochaperone 2), RBFOX2 (RNA Binding Fox-1 Homolog 20), and PTBP2 (Polypyrimidine Tract Binding Protein 2) splicing factors are associated with poor prognosis and alternative splicing events [86].