[Venetoclax Combined with CACAG Regimen in the Treatment of Patients with Refractory/Relapse Acute Myeloid Leukemia: A Prospective Clinical Study].

OBJECTIVE:To investigate the efficacy and safety of Venetoclax combined with CACAG regimen in treatment of patients with refractory/relapse acute myeloid leukemia(R/R AML). METHODS:The study was a singlecenter prospective clinical trial. The enrolled patients met the criteria for R/R AML. Treatment included Azacidine(75 mg/m2，d 1-7), Ara-C (75-100 mg/m2, q12h, d 1-5), Aclacinomycin(20 mg d1,d3,d5), Chidamide(30 mg d1,d4), Venetoclax(100 mg d1, 200 mg d2, 400 mg d3-d14, in combination with Triazole Drug, reduced to 100 mg/d), and granulocyte colony-stimulating factor (300 μg /d until neutrophil recovery). The primary endpoint of observation was overall response rate after 1 course of treatment. RESULTS:A total of 19 patients were enrolled from January 2022 to April 2023. After 1 course of treatmen, the overall response rate was 81.3%(13/16), the CR rate was 68.8%(11/16), and the PR was 12.5%(2/16). Among the 11 patients who got CR/CRi, 8 cases achieved CRm (minimal residual disease negative CR) and 3 cases did not. As of March 27, 2023, the median follow-up time was 111(19-406) days. The six-month overall survival and progression-free survival rates were both 55.7%, the 1-year overall survival and progression-free survival rates were 46.4% and 47.7%, respectively. In addition, compared with the non-CRm group, CRm patients had a better PFS (377 days vs 111 days, P =0.046). Treatment-related adverse events were mainly 3-4 degrees of bone marrow suppression, complicated by various degrees of infection(n=12), hypokalemia(n=12) and hypocalcemia (n=10) and elevated liver enzymes (n=8), of which 3/4 degrees accounted for 47.4%(9/19). CONCLUSION:The Venetoclax combined with CACAG regimen is an effective salvage therapy for patients with R/R AML, with high remission rate and safety profile.