Azacitidine-CHOP for Patients With Nodal T-cell Lymphoma With T-follicular Helper Phenotype (ACANTUS)

Inclusion Criteria: 1. Treatment-naïve patients with newly diagnosed nodal T-cell lymphoma with T-follicular helper (TFH) phenotype as determined by the following 2016 WHO diagnostic criteria: * Angioimmunoblastic T-cell lymphoma * Follicular helper T-cell lymphoma * Peripheral T-cell lymphoma with follicular helper T-cell type 2. 20 to 85 years of age at diagnosis 3. ECOG performance status 0-2 4. Cardiac function suitable for chemotherapy: LVEF ≥45% on echocardiography or MUGA 5. Appropriate renal function: Serum Cr ≤2.0mg/dL or eGFR ≥ 30mL/min according to the Cockroft-Gault formula 6. Appropriate hepatic function: ALT ≤2.5x upper limit of normal (ULN) (or ≤5x ULN in the presence of liver involvement), total bilirubin ≤2x ULN (or ≤3x ULN in the presence of liver involvement) 7. Appropriate hematologic findings: absolute neutrophil count (ANC) ≥1,500/μL, platelets ≥100,000/μL (or ANC ≥500/μL and platelets ≥50,000/ μL in the presence of bone marrow involvement) 8. Written informed consent to participate in the study 9. Capable of following the study visit schedule and other requirements in the protocol 10. For women of childbearing potential, a negative pregnancy test 11. Women of childbearing potential must use an effective method of contraception (i.e., hormonal contraception, intrauterine device, diaphragm with spermicide, condom with spermicide, or abstinence) during the study period and for 3 months afterward. Men are to use an effective method of contraception during the study period and for 3 months afterward. 12. Life expectancy ≥90 days (3 months) 13. Hepatitis B or C infection: Hepatitis B carriers and subjects with inactive hepatitis C infection (normal levels of aminotransferases) are eligible if they take prophylactic antiviral drugs Exclusion Criteria: 1. Other subtypes of non-Hodgkin's lymphoma 2. History of chemotherapy for Hodgkin's or other non-Hodgkin's lymphoma in the last 5 years 3. History of active cancer diagnosed within the last 3 years (with the exception of completely resected non-melanoma skin cancer, papillary thyroid cancer, carcinoma in situ of cervical cancer or breast cancer, and localized prostate cancer) 4. Uncontrolled hepatitis B (with the exception of asymptomatic HBsAg-positive or anti-HBcAb-positive cases receiving antiviral prophylaxis such as entecavir or tenofovir) 5. History of chronic hepatitis C (with the exception of HCV IgG positive with a negative HCV-RNA quantification) 6. History of human immunodeficiency virus (HIV) infection 7. Congestive heart failure (NYHA class ≥3) 8. Acute coronary syndrome (new-onset unstable angina or myocardial infarction) or ventricular tachycardia within 6 months prior to study entry 9. History of major neurological or psychiatric illness, including dementia or epilepsy 10. Severe chronic obstructive pulmonary disease with hypoxemia 11. Cerebrovascular disease within 3 months prior to study entry (including transient cerebral ischemia) 12. Unresolved wounds, ulcers, or bone fractures 13. Uncontrolled active infections (viral, bacterial, or fungal infections) 14. Concurrent use of other experimental drugs under investigation 15. Known hypersensitivity to the investigational drugs 16. History of major surgery or serious trauma within 21 days prior to study treatment. Open biopsy within 7 days prior to study treatment 17. Male subjects who had not undergone a vasectomy and have a partner who plans to become pregnant or are unable to use a medically acceptable method of contraception (partner's sterilization or intrauterine device placement, or barrier method combined with diaphragm or condom) during the subject's participation in the study 18. Pregnant or breastfeeding women or women of childbearing potential and men who are not willing to use appropriate methods of contraception during the study 19. Previously treated for T-cell lymphoma with immunotherapy or chemotherapy, except for short-term corticosteroids (for less than 8 days) prior to selection 20. Prior radiotherapy, except for those localized to a single lymph node 21. Central nervous system involvement 22. Contraindication to any of the drugs included in the chemotherapy 23. History of administration of doxorubicin at \>200 mg/m²