3. Successful surgical resection • Complete resection (R0) or with microscopic residual disease (R1) • Expected to receive gemcitabine monotherapy as adjuvant chemotherapy 4. Laboratory Values: • Absolute neutrophil count > 1.5 x 109/l • Platelets > 100 x 109/l • Haemoglobin > 9 g/dl • Total bilirubin < 1.5 x UNL • Serum creatinine < 1.5 x UNL • Albumin > 2.5 g/dl • AST or ALT < 5 x UNL 5. 18 years of age or older.