PD-1 Antibody, Chidamide, Lenalidomide and Gemcitabine for Peripheral T-cell Lymphoma

Inclusion Criteria:

* age:14-65 years;Eastern Cooperative Oncology Group (ECOG)score≤3;expected survival≥3 months
* patients with Peripheral T-cell Lymphoma diagnosed by immuno-histochemistry (IHC);
* acceptable hematological indicators, no chemotherapy contraindications;
* total bilirubin ≤ 1.5 times the upper limit of normal (ULN), alanine aminotransferase (ALT) ≤ 2.5 x upper age limit (ULN), if the abnormal laboratory parameters are considered to be caused by lymphoma, patients Eligible conditions should be adjusted to be incorporated into the group;
* At least one measurable lesion by CT or PET-CT（Positron Emission Tomography-Computed Tomography）;
* exclude other major diseases, normal heart and lung function;
* Female patients of childbearing age are negative for pregnancy test;
* Cooperate with follow-up;
* There are no other related treatments including traditional Chinese medicine, immunotherapy, and biologic therapy (except for the treatment of anti-bone metastases and other symptoms);
* Signing informed consent \*: Pathological histology must be consulted by a pathologist at a provincial hospital.

Exclusion Criteria:

* Patients with ALK-positive Anaplastic Large Cell Lymphoma or angioimmunoblastic T-cell lymphoma
* rejecting providing blood preparation;
* allergic to drug in this study and with metabolic block;
* rejecting adopting reliable contraceptive method in pregnancy or lactation period;
* uncontrolled internal medicine disease(including uncontrolled diabetes,severe incompetence cardiac, lung, liver and pancreas）；
* with severe infection;
* with primary or secondary central nervous system tumor invasion;
* with immunotherapy or radiotherapy contraindication;
* ever suffered with malignant tumor;
* having peripheral nervous system disorder or dysphrenia;
* with no legal capacity,medical or ethical reasons affecting research proceeding;
* participating other clinical trials simultaneously;
* adopting other anti-tumor medicine excluding this research;
* Patients with immunodeficiency, such as primary immunodeficiency syndrome or organ transplant recipients
* Human immunodeficiency virus (HIV)-positive patients
* the researchers considering it inappropriate to participate in the study.
* Patients with immune system diseases