Cited by 582Musculoskeletal synovial abnormalities and treatmentsRheumatoid Arthritis Research and TherapiesSarcoma Diagnosis and Treatment

Structure-guided blockade of CSF1R kinase in tenosynovial giant-cell tumor

Tap, William D., Wainberg, Zev A., Anthony, Stephen P., Ibrahim, Prabha N., Zhang, Chao, Healey, John H., Chmielowski, Bartosz, Staddon, Arthur P. +32 more·2015·New England Journal of Medicine

Abstract

BACKGROUND: Expression of the colony-stimulating factor 1 (CSF1) gene is elevated in most tenosynovial giant-cell tumors. This observation has led to the discovery and clinical development of therapy targeting the CSF1 receptor (CSF1R). METHODS: Using x-ray co-crystallography to guide our drug-discovery research, we generated a potent, selective CSF1R inhibitor, PLX3397, that traps the kinase in the autoinhibited conformation. We then conducted a multicenter, phase 1 trial in two parts to analyze this compound. In the first part, we evaluated escalations in the dose of PLX3397 that was administered orally in patients with solid tumors (dose-escalation study). In the second part, we evaluated PLX3397 at the chosen phase 2 dose in an extension cohort of patients with tenosynovial giant-cell tumors (extension study). Pharmacokinetic and tumor responses in the enrolled patients were assessed, and CSF1 in situ hybridization was performed to confirm the mechanism of action of PLX3397 and that the pattern of CSF1 expression was consistent with the pathological features of tenosynovial giant-cell tumor. RESULTS: A total of 41 patients were enrolled in the dose-escalation study, and an additional 23 patients were enrolled in the extension study. The chosen phase 2 dose of PLX3397 was 1000 mg per day. In the extension study, 12 patients with tenosynovial giant-cell tumors had a partial response and 7 patients had stable disease. Responses usually occurred within the first 4 months of treatment, and the median duration of response exceeded 8 months. The most common adverse events included fatigue, change in hair color, nausea, dysgeusia, and periorbital edema; adverse events rarely led to discontinuation of treatment. CONCLUSIONS: Treatment of tenosynovial giant-cell tumors with PLX3397 resulted in a prolonged regression in tumor volume in most patients. (Funded by Plexxikon; ClinicalTrials.gov number, NCT01004861.).

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Crossref · 10.1056/nejmoa1411366

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Authors
Tap, W. D., Wainberg, Z. A., Anthony, S. P., Ibrahim, P. N., Zhang, C., Healey, J. H., Chmielowski, B., Staddon, A. P., Cohn, A. L., Shapiro, G. I., Keedy, V. L., Singh, A. S., Puzanov, I., Kwak, E. L., Wagner, A. J., Von Hoff, D. D., Weiss, G. J., Ramanathan, R. K., Zhang, J., Habets, G., Zhang, Y., Burton, E. A., Visor, G., Sanftner, L., Severson, P., Nguyen, H., Kim, M. J., Marimuthu, A., Tsang, G., Shellooe, R., Gee, C., West, B. L., Hirth, P., Nolop, K., van de Rijn, M., Hsu, H. H., Peterfy, C., Lin, P. S., Tong-Starksen, S., & Bollag, G.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • University of California, Los Angeles (US)
  • Plexxikon (United States) (US)
  • University of Pennsylvania (US)
  • Rocky Mountain Cancer Centers (US)
  • Dana-Farber Cancer Institute (US)
  • Vanderbilt University Medical Center (US)
  • Massachusetts General Hospital (US)
Venue
New England Journal of Medicine
Published
2015-07-30
Volume
373
Issue
5
Pages
428-437
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W982662479
Cited by
582
References
23
Citations by year
2026: 30 · 2025: 47 · 2024: 66 · 2023: 62 · 2022: 65 · 2021: 61 · 2020: 65 · 2019: 50 · 2018: 54 · 2017: 40 · 2016: 30 · 2015: 7 · 2014: 2 · 2013: 1
FWCI
36.65
Type
journal article
Language
en
Open access
closed
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Rheumatology › Musculoskeletal synovial abnormalities and treatments
  • Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Sarcoma Diagnosis and Treatment
Keywords
tenosynovial giant cell tumor, CSF1R inhibitor, PLX3397, colony-stimulating factor 1, kinase autoinhibition, structure-based drug design, oral kinase inhibitor, dose escalation, tumor response, adverse events
MeSH terms
Adult, Aged, Aminopyridines, Dose-Response Relationship, Drug, Female, Giant Cell Tumors, Humans, Male, Middle Aged, Pyrroles, Soft Tissue Neoplasms, Tendons, Receptor, Macrophage Colony-Stimulating Factor, Crystallography, X-Ray, Tumor Burden, Drug Discovery

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