- Cyclooxygenase-1, but not -2, is upregulated in NB4 leukemic cells and human primary promyelocytic blasts during differentiation. Rocca, B., Morosetti, R., Habib, A., Maggiano, N., Zassadowski, F., Ciabattoni, G., Chomienne, C., Papp, B., Ranelletti, F.O. Leukemia (2004)