A Study of Evaluating the Safety and Efficacy of ATG-010 Combined With Chemotherapy Sequential With ATG-010 Monotherapy Maintenance in Peripheral T- and NK/T-cell Lymphoma

Inclusion Criteria: 1. The patient is willing to provide written ICF. 2. Age≥ 18 years. 3. R/R PTCL and NK/T-cell lymphoma as confirmed by histological methods according to WHO classification of tumors of lymphoid tissues 2016. 4. Previously received at least one or more standard regimens including anthracycline. 5. Recurrence or the recurrence disease after the last treatment completed. 6. At least one measurable disease per modified efficacy assessment criteria (Cheson 2014). 7. ECOG PS 0 or 1. 8. Any toxicity caused by previously anti-tumor therapy must recovered to ≤ Grade 1 (NCI-CTCAE v5.0) with exception of hearing loss, alopecia, and pigmentation. 9. Expected life time longer than 3 months. Exclusion Criteria: 1. Current have disease or history of central nervous system lymphoma. 2. HBV-DNA positive, or HCV-RNA positive. 3. Patients with a known history of human immunodeficiency virus (HIV) infection and/or acquired immunodeficiency syndrome. 4. Received major surgery within 4 weeks of first dose of study drug 5. Known received SINE, including ATG-010. 6. Unable to swallow the tablets, suffers from malabsorption syndrome, or any other gastrointestinal disease or dysfunction that may interfere with ATG-010 absorption. 7. Known allergy to ATG-010, or ICE, or GEMOX. 8. A woman who is pregnant or nursing. 9. The investigator considerations on patient's complications or other conditions may affect protocol compliance or may be inappropriate for participation in the study.