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Kymera Therapeutics Receives U.S. FDA Fast Track Designation for KT-333, a First-in-Class, Investigational STAT3 Degrader for the Treatment of Relapsed/Refractory Cutaneous T-Cell Lymphoma and Relapsed/Refractory Peripheral T-Cell Lymphoma
Fast TrackOrphan DrugClinical Result
KT-333 Phase 1 oncology trial ongoing with an update including initial evaluation of its clinical antitumor activity in patients expected in the fourth quarter of 2023
Fast Track designation can potentially accelerate KT-333’s development path for the treatment of R/R Cutaneous T-Cell Lymphoma and R/R Peripheral T-Cell Lymphoma
Kymera Therapeutics, Inc. (NASDAQ: KYMR), a clinical-stage biopharmaceutical company advancing targeted protein degradation to deliver novel small molecule protein degrader medicines, today announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to KT-333 for the treatment of R/R Cutaneous T-cell Lymphoma (CTCL) and R/R Peripheral T-cell Lymphoma (PTCL).
KT-333 is a highly selective degrader of STAT3 in development for the treatment of multiple STAT3-dependent pathologies, including hematological malignancies and solid tumors. STAT3 is a transcriptional regulator that has been linked to numerous cancers as well as to inflammatory and autoimmune diseases. In 2022, KT-333 received FDA orphan drug designation for the treatment of both CTCL and PTCL.
“The KT-333 Fast Track designation highlights the promise of degrading STAT3, a protein that has historically been undruggable, for the treatment of patients with CTCL and PTCL,” said Jared Gollob, MD, Chief Medical Officer, Kymera Therapeutics. “We look forward to providing an update on the KT-333 Phase 1 clinical trial later this year, including initial evaluation of its antitumor activity in the target patient populations, and to working with the lymphoma community to rapidly advance this first-in-class heterobifunctional degrader in CTCL and PTCL in addition to exploring its potential in other cancers.”
The FDA’s Fast Track process is designed to get important new medicines to patients more quickly, facilitating the development and expediting the review of therapies intended to treat serious conditions and address unmet medical needs. Companies whose programs are granted Fast Track designation are eligible for more frequent interactions with the FDA during clinical development and potentially accelerated approval and/or priority review, if relevant criteria are met. For more information on the Fast Track process, please visit the FDA’s official website.
About the KT-333 Clinical Program
The Phase 1 clinical trial of KT-333 is designed to evaluate the safety, tolerability, PK/PD and clinical activity of KT-333 dosed weekly in adult patients with relapsed and/or refractory lymphomas, leukemias and solid tumors. In June at the International Conference on Malignant Lymphoma (ICML), with a data cutoff date of May 1, 2023, Kymera presented data on thirteen patients who received a mean of five doses across the first four dose levels (DL1-4) of the trial, including patients with solid tumors, CTCL and PTCL. With DL4 still open to accrual at the time of the presentation, data reported from DL1-3 found plasma exposure increased with dose, reaching levels close to those predicted to be efficacious, and demonstrated dose-dependent STAT3 degradation with up to 88% mean maximum reduction in peripheral blood mononuclear cells and degradation profiles at DL3 near levels of knockdown that led to antitumor activity in preclinical models. We shared at ICML that there were no dose-limiting toxicities observed in the study. The Phase 1a dose escalation stage is ongoing, recruiting broadly across solid and liquid tumors, and more information can be found at www.clinicaltrials.gov, identifier NCT05225584.
About Cutaneous T-Cell Lymphoma
Cutaneous T-cell lymphoma (CTCL) is a general term for non-Hodgkin’s T-cell lymphomas that are primarily characterized by an abnormal accumulation of T-cells in the skin and can involve the blood, lymph nodes and other internal organs. Approximately 3,000 CTCL patients are diagnosed in the U.S. each year, and CTCL accounts for 25% of T-cell lymphomas in the U.S. CTCL is a typically slow-growing cancer, with symptoms such as dry skin, potentially severe itching, rashes and enlarged lymph nodes. Since symptoms and skin biopsy findings are similar to other skin conditions, early-stage diagnosis can be difficult.
About Peripheral T-cell Lymphoma
PTCL, a subtype of non-Hodgkin’s lymphoma, is a heterogenous group of tumors that arise from mature T-cells in the lymphoid tissues in areas such as the lymph nodes, lungs, gastrointestinal tract and skin. Approximately 4,000-8,000 PTCL patients are diagnosed in the U.S. each year, and PTCL accounts for 15% to 20% of aggressive lymphomas in the U.S. PTCL carries a poorer prognosis than other non-Hodgkin’s lymphomas since it is less responsive to standard chemotherapy regimens.
About Kymera Therapeutics
Kymera is a biopharmaceutical company pioneering the field of targeted protein degradation, a transformative approach to address disease targets and pathways inaccessible with conventional therapeutics. Kymera’s Pegasus platform is a powerful drug discovery engine, advancing novel small molecule programs designed to harness the body’s innate protein recycling machinery to degrade dysregulated, disease-causing proteins. With a focus on undrugged nodes in validated pathways, Kymera is advancing a pipeline of novel therapeutic candidates designed to address the most promising targets and provide patients with more effective treatments. Kymera’s initial programs target IRAK4, IRAKIMiD, and STAT3 within the IL-1R/TLR or JAK/STAT pathways, and the MDM2 oncoprotein, providing the opportunity to treat patients with a broad range of immune-inflammatory diseases, hematologic malignancies, and solid tumors.
Founded in 2016, Kymera is headquartered in Watertown, Mass. Kymera has been named a “Fierce 15” company by Fierce Biotech and has been recognized by both the Boston Globe and the Boston Business Journal as one of Boston’s top workplaces. For more information about our people, science and pipeline, please visit www.kymeratx.com or follow us on Twitter or LinkedIn.
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