CHEK1 and mature T-cell and NK-cell non-Hodgkin lymphoma: The median relative expression in the 63 nodal PTCL patients was 2.00 for CCNA2, 4.22 for TOP2A, 6.20 for CHEK1, 0.49 for VEGF1, 10.59 for NFkB1, and 8.35 for IKBkB. Gene expression was analyzed as a qualitative categorical variable, taking into account values < or ≥ the median.