Serum concentrations of PBD-conjugated antibody and total antibody by dose over time. Semilog plot of mean (+ standard error) concentration of PBD-conjugated antibody and total antibody in serum vs time by dose for patients on the Q3W dosing regimen (A) and patients on the QW dosing regimen (B). Concentrations below the LLOQ are inputted as 1/2 LLOQ.