Chidamide Plus Etoposide and Cisplatin/Carboplatin as First-line Treatment for Extrapulmonary Neuroendocrine Carcinoma

Inclusion Criteria:

1. Age ≥ 18 years;
2. Histologically confirmed locally advanced and metastatic extrapulmonary neuroendocrine carcinoma;
3. No systematic treatments for neuroendocrine carcinoma are received before enrollment;
4. ECOG ≤ 2;
5. Have at least one measurable lesion according to RECIST version 1.1, and the lesion has not received any local treatments;
6. Absolute neutrophil count ≥ 1.5×109 / L, platelet count ≥ 100×109 / L, hemoglobin ≥ 90 g/L;
7. Have ability to sign a written informed consent.

Exclusion Criteria:

1. Have surgery or trauma within 4 weeks before enrollment, or are expected to receive surgical treatment;
2. Previous use of HDAC inhibitors;
3. Allergy to related drug components;
4. Have a medical history of immune deficiency diseases, or organ transplantation;
5. Have uncontrolled or significant cardiovascular disease;
6. Abnormal liver function (total bilirubin \> 1.5×upper limit of normal); Transaminases (ALT/AST) \>2.5×upper limit of normal (\>5x upper limit of normal for patients with liver metastases), abnormal renal function (serum creatinine \> 1.5×upper limit of normal);
7. Pregnancy ;
8. Have serious diseases that may endanger the safety of patients, or affect patients to complete the research;
9. Any serious mental or cognitive disorder;
10. Patients are currently enrolled in another drug clinical trial within 4 weeks prior to enrollment;
11. Any other condition which is inappropriate for the study in the opinion of the investigators.