Serum cytokine concentrations and immunohistochemical analysis of tumor biopsies. C = cycle. D = day. A, B, C: Serum concentrations of sIL2R (A), neopterin (B) and IL10 (C) before, during, and after infusions of EMD 273063. Serum samples were drawn before the first infusion (C1D1), during the first cycle infusion (C1D2 and C1D3) and then immediately before (C2D1) and during the second cycle of EMD 273063 (C2D2, C2D3). Depicted are the serum concentrations for each patient tested by ELISA. D: Immunohistochemical analysis of a pre-dosing and cycle 1 post-dosing tumor biopsies from patient 4104, who had disease stabilization over two cycles. Paraffin-fixed melanoma tumor specimens stained by immunohistochemistry for GD2, S100, and CD8 positive prior to and after exposure to EMD 273063.