CMPK1 and neoplasm: To determine whether the expression of UCK1 or UCK2 correlates with UCK activity, their mRNA expression was measured in a panel consisting of six tumor cell lines (U937, A459, CCRF-CEM, SW1573, AG6000 and A2780) and in a panel derived from seven xenograft cells (LS174T, BT474, RT112, Raji B, SW780, PANC-1, C-33A).