Changes in monocyte numbers and activation state 2 days following the first dose of Melanoma GVAX correlate with serum GM-CSF concentrations at C1D3. Changes (Δ) were calculated by subtracting baseline values (C1D1 for cohorts A and B, or C1D0 for Cohort C) from values obtained at cycle 1, day 3. Data from 19 patients are shown. Monocyte activation was quantified by measuring mean fluorescence intensity (MFI) of HLA-DR expression on CD14+ , CD11b+ events by flow cytometry. r values are from a 2-sided Spearman Correlation Analysis.