MKI67 and nasopharyngeal carcinoma: Treatment of differentiating NPC with Gro1 for 72 h markedly decreased the percentage of Tuj-1+ neuroblasts positive for Ki67 (t(15) = − 3.9, p = 0.0061), while the number of Ng2+/Ki67+ oligodendrocyte progenitor cells was increased (t(18) = 4.64, p = 0.0002).