Western blotting for COX-2 expression. A representative example of COX-2 expression analysis on MM samples. Patient 1, patient 3, and patient 4 were scored COX-2 positive. Patient 2 was scored COX-2 negative. β-actin loading control is shown in both experiments. Pos, indicates positive control (HT-29 cell line); Neg, negative control (normal BM).