Study to Compare Capecitabine Combined With Dacarbazine(CAPDTIC) Versus Capecitabine Combined Temozolomide(CAPTEM) in Advanced and Metastatic Gastrointestinal Pancreatic and Esophageal Neuroendocrine Tumor

Inclusion criteria

• ✓. sign written informed consent form
• ✓. age ≥ 18 years
• ✓. pathologically confirmed well-differentiated neuroendocrine tumor;
• ✓. No prior antitumor treatment of capecitabine, dacarbazine or temozolomide. For recurrent patients after radical surgery, adjuvant chemotherapy should not include capecitabine, dacarbazine or temozolomide, and the last date should beyond 6 months prior to randomization;
• ✓. At least 1 measurable lesion (only 1 measurable lymph node lesion is excluded) (routine CT scan \>=20mm, spiral CT scan \>=10mm, no prior radiation to measurable lesions);
• ✓. Screening laboratory values must meet the following criteria (within past 7 days): hemoglobin ≥ 9.0 g/dL; neutrophils ≥ 1500 cells/ μL; platelets ≥ 100 x 10\^3/ μL; total bilirubin ≤ 1.5 x upper limit of normal (ULN); aspartic transaminase (AST) and alanine transaminase (ALT) ≤ 2.5 x ULN without, and ≤ 5 x ULN with hepatic metastasis; serum creatinine ≤1╳ULN;
• ✓. KPS ≥ 70;
• ✓. Predicted survival \>=3 months;

Exclusion criteria