CDKN1B and neoplasm: Fig. 1B shows a visual representation of p27Kip1 and ODC mRNA expression measured with Affymetrix profiling for every tumor in the NB88 set. An inverse relation between p27Kip1 and ODC expression (r = −0.216, P=0.04) was observed. This suggests that ODC expression and intracellular polyamine levels may inhibit p27Kip1 expression or decrease p27 Kip1 mRNA stability.