Systemic concentrations of avelumab and chemotherapies were measured in patient blood samples to estimate relevant pharmacokinetic parameters. Blood samples (3.5 mL) for avelumab pharmacokinetic analyses were collected prior to dosing and at the end of infusion on day 1 of cycles 1, 2, 3, 6, 10, and 14; additional samples were collected on day 15 of cycles 1, 2, and 3. Blood samples (3.5 mL) for avelumab immunogenicity analyses were collected prior to dosing on day 1 of cycles 1, 2, 3, 6, 10, and 14 and at the end of treatment.