Session: 732. Clinical Allogeneic Transplantation: Results: Poster II
Hematology Disease Topics & Pathways:
Biological, Adult, Therapies, Study Population, transplantation
Results: We analyzed all 283 patients treated on a two-step HI HSCT clinical trial at our institution. The median follow-up is 63 (range 1-165) months. Diagnoses were AML (n=118), MDS (n=43), myeloproliferative disorder (n=7), CMML (n=3), B-ALL (n=21), Ph+ ALL (n=15), multiple myeloma (n=14), T cell ALL (n=9), aggressive lymphoma (n=15), CLL (n=8), Hodgkin (n=7), aplastic anemia (n=5), and lymphoma-other (n=18). Patients had high (45%), intermediate (43%), very high (5%), and low (4%) risk disease per the Revised Disease Risk Index. Median age of the group is 58 (19-78) years and 21% of patients were >age 65. Conditioning was MA in 56%, RIC in 37%, and NMA in 7%. All patients received 2 x 108/kg CD3+ cells in step 1 of the HSCT except for 1 early patient who received 1.7 x 108/kg CD3+ cells. Median CD34 cell dose was 6.3 (range 1.0-20.0) x 106/kg, median non-CY-exposed T cells in the CD34 product was 2.88 (range 0.33-50.0) x 103/kg.
Patients developed a haploimmunostorm manifested by high grade fever, diarrhea and rash within 24 hours of receiving DLI. These symptoms effectively resolved after the administration of CY. Median peak fever of patients during the haploimmunostorm was 103.6 (range 98.6-106.1). No patients died as a consequence of the haploimmunostorm. Cumulative incidence (CI) of donor engraftment was 97%. Median time to neutrophil and platelet engraftment was 11 (8-21) days and 17 (10-173) days respectively. All results at 2 years: CI of relapse and NRM were 25% each. CI grades 2-4 and 3-4 acute GVHD were 39% and 7% respectively, and CI chronic GVHD was 15%. Probability of survival (OS) was 55% in the total cohort and 34% in patients >65 years. In patients with AML which represented the largest subgroup of patients, OS was 51% in the total cohort and 40% in patients > 65.
Conclusion: HI HSCT using the two-step approach is an effective treatment for a variety of hematologic malignancies and dyscrasias. Despite older age, over 1/3 of patients >65 years were alive 2 years after HI-HSCT.
Disclosures: Flomenberg: Tevogen: Consultancy, Honoraria.
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