An Open, Multicenter Phase II Study to Evaluate the Safety and Efficacy of KL-A167 Injection in Relapsed or Refractory Classical Hodgkin's Lymphoma

Inclusion Criteria: * 18 years and older * Histopathological confirmed classical Hodgkin's lymphoma * Relapsed/refractory cHL include：subject with no response to or with progression after ASCT ；subject which failed failed second line and above chemtherapy；subject which didn't achieve PR after 2 cycles or didn't achieve CR after 4 cycles * At least one measurable disease (long axis\>15 mm and short axis\>5 mm,or both axis\>10 mm） * ECOG performance status of 0 or 12 * Subject must have adequate organ functions and meet requirements on laboratory values.：Count of Blood Cells: absolute neutrophil count (ANC) ≥ 1.0 × 109 / L; platelet count (PLT) ≥ 50 × 109 / L; hemoglobin content (HGB) ≥ 7.0 g / Dl; Liver function: serum total bilirubin (TBIL) ≤ 1.5 × normal upper limit (ULN); alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 3 × ULN，with the exception of patients with hepatic metastases (ALT and AST ≤ 5 × ULN) and patients with hepatic metastases or Gilbert's syndrome (total bilirubin ≤ 3 × ULN)Renal function: serum creatinine (Cr) ≤ 1.5 × ULN or Creatinine clearance rate（CCR）≥50 mL/min；International normalized ratio (INR) ≤ 1.5 x ULN ；Thyroid function: thyroid stimulating hormone (TSH) in normal range. * Prior chemotherapy, radiotherapy, immunotherapy or investigational therapy (including Chinese herbal medicine and Chinese patent medicine) used to control cancer including locoregional treatment must have been completed ≥ 4 weeks before the first dose of K…