ALB and neoplasm: The paclitaxel content after a 1 hour incubation in AB serum stayed about the same as the 24 hours in saline (63.9 vs 70.9%) suggesting that the greater than 100 kD fraction is stable in serum and the paclitaxel is not exchanged from the ABX albumin to endogenous albumin, which is crucial to maintain the antibody-ligand mediated targeting of tumor cells.