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Chi SN, Yi JS, Williams PM, Roy-Chowdhuri S, Patton DR, Coffey BD, Reid JM, Piao J, Saguilig L, Alonzo TA, Berg SL, Ramirez NC, Jaju A, Mhlanga JC, Fox E, Hawkins DS, Mooney MM, Takebe N, Tricoli JV, Janeway KA, Seibel NL, Parsons DW. Tazemetostat for tumors harboring SMARCB1/SMARCA4 or EZH2 alterations: results from NCI-COG pediatric MATCH APEC1621C. J Natl Cancer Inst 2023; 115:1355-1363. [PMID: 37228094 PMCID: PMC11009504 DOI: 10.1093/jnci/djad085] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/09/2023] [Accepted: 05/11/2023] [Indexed: 05/27/2023] Open
Abstract
BACKGROUND National Cancer Institute-Children's Oncology Group Pediatric Molecular Analysis for Therapy Choice assigns patients aged 1-21 years with refractory solid tumors, brain tumors, lymphomas, and histiocytic disorders to phase II trials of molecularly targeted therapies based on detection of predefined genetic alterations. Patients whose tumors harbored EZH2 mutations or loss of SMARCB1 or SMARCA4 by immunohistochemistry were treated with EZH2 inhibitor tazemetostat. METHODS Patients received tazemetostat for 28-day cycles until disease progression or intolerable toxicity (max 26 cycles). The primary endpoint was objective response rate; secondary endpoints included progression-free survival and tolerability of tazemetostat. RESULTS Twenty patients (median age = 5 years) enrolled, all evaluable for response and toxicities. The most frequent diagnoses were atypical teratoid rhabdoid tumor (n = 8) and malignant rhabdoid tumor (n = 4). Actionable alterations consisted of SMARCB1 loss (n = 16), EZH2 mutation (n = 3), and SMARCA4 loss (n = 1). One objective response was observed in a patient with non-Langerhans cell histiocytosis with SMARCA4 loss (26 cycles, 1200 mg/m2/dose twice daily). Four patients with SMARCB1 loss had a best response of stable disease: epithelioid sarcoma (n = 2), atypical teratoid rhabdoid tumor (n = 1), and renal medullary carcinoma (n = 1). Six-month progression-free survival was 35% (95% confidence interval [CI] = 15.7% to 55.2%) and 6-month overall survival was 45% (95% CI = 23.1% to 64.7%). Treatment-related adverse events were consistent with prior tazemetostat reports. CONCLUSIONS Although tazemetostat did not meet its primary efficacy endpoint in this population of refractory pediatric tumors (objective response rate = 5%, 90% CI = 1% to 20%), 25% of patients with multiple histologic diagnoses experienced prolonged stable disease of 6 months and over (range = 9-26 cycles), suggesting a potential effect of tazemetostat on disease stabilization.
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Affiliation(s)
- Susan N Chi
- Department of Pediatrics, Dana-Farber/Boston Children’s Cancer and Blood Disorders Center, Harvard Medical School, Boston, MA, USA
| | - Joanna S Yi
- Department of Pediatrics, Texas Children’s Cancer and Hematology Center, Baylor College of Medicine, Houston, TX, USA
| | - P Mickey Williams
- Molecular Characterization Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Sinchita Roy-Chowdhuri
- Department of Pathology and Laboratory Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David R Patton
- Center for Biomedical Informatics and Information Technology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Brent D Coffey
- Center for Biomedical Informatics and Information Technology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Joel M Reid
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, USA
| | - Jin Piao
- Department of Biostatistics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Lauren Saguilig
- Children’s Oncology Group Statistical Center, Monrovia, CA, USA
| | - Todd A Alonzo
- Department of Biostatistics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Stacey L Berg
- Department of Pediatrics, Texas Children’s Cancer and Hematology Center, Baylor College of Medicine, Houston, TX, USA
| | - Nilsa C Ramirez
- Biopathology Center, Research Institute at Nationwide Children’s Hospital, Columbus, OH, USA
| | - Alok Jaju
- Department of Radiology, Ann and Robert H. Lurie Children's Hospital, Chicago, IL, USA
| | - Joyce C Mhlanga
- Department of Radiology, Washington University School of Medicine, St Louis, MO, USA
| | - Elizabeth Fox
- Department of Oncology, St Jude Children’s Research Hospital, Memphis, TN, USA
| | - Douglas S Hawkins
- Department of Hematology-Oncology, Seattle Children’s Hospital, University of Washington, Seattle, WA, USA
| | - Margaret M Mooney
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, Cancer Therapy Evaluation Program, Bethesda, MD, USA
| | - Naoko Takebe
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, Cancer Therapy Evaluation Program, Bethesda, MD, USA
| | - James V Tricoli
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, Bethesda, MD, USA
| | - Katherine A Janeway
- Department of Pediatrics, Dana-Farber/Boston Children’s Cancer and Blood Disorders Center, Harvard Medical School, Boston, MA, USA
| | - Nita L Seibel
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, Cancer Therapy Evaluation Program, Bethesda, MD, USA
| | - D Williams Parsons
- Department of Pediatrics, Texas Children’s Cancer and Hematology Center, Baylor College of Medicine, Houston, TX, USA
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