Silmitasertib (CX-4945) in Combination With Chemotherapy for Relapsed Refractory Solid Tumors

Recruiting now · Phase 1/Phase 2

Conditions studied: Neuroblastoma, Ewing Sarcoma, Osteosarcoma, Rhabdomyosarcoma, Liposarcoma

In brief

The purpose of this study is to evaluate the investigational drug, silmitasertib (a pill taken by mouth), in combination with FDA approved drugs for solid tumors. An investigational drug is one that has not been approved by the U.S. Food \& Drug Administration (FDA), or any other regulatory authorities around the world for use alone or in combination with any drug, for the condition or illness it is being used to treat. The goals of this part of the study are: * Establish a recommended dose of silmitasertib in combination with chemotherapy * Test the safety and tolerability of silmitasertib in combination with chemotherapy in subjects with cancer * To determine the activity of study treatments chosen based on: * How each subject responds to the study treatment * How long a subject lives without their disease returning/progressing

Key facts

Study ID

NCT06541262

Run by

Milton S. Hershey Medical Center

People needed

104

Starts

2024-10-30

Expected to finish

2035-11-01

Last updated by the study team

2026-07-02

Who can join

Age: any, up to 30. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Age: Less than 30 years old at initial diagnosis
• Pathology All subjects must have a confirmed diagnosis of tumor type. Phase I: Relapsed/refractory solid tumors: Neuroblastoma, Ewing Sarcoma, Osteosarcoma, Rhabdomyosarcoma, Liposarcoma
• Phase II:
• Relapsed/refractory Neuroblastoma
• Relapsed/refractory Ewing sarcoma
• Tumor assessment:
• Disease assessment is required for eligibility and must be done after last dose of previous therapy and prior to first dose of study drug.
• Disease Status:
• Relapsed/Refractory Neuroblastoma Relapsed disease defined as neuroblastoma that was previously in remission after standard therapy (at least 4 cycles of aggressive multi-drug induction chemotherapy, with or without radiation and surgery, followed by immunotherapy, or according to a standard high-risk treatment/neuroblastoma protocol) and has now relapsed and is in any number of relapses.
• Refractory disease defined as High-risk neuroblastoma (as defined by INRG) that failed to achieve CR after at least 4 cycles of aggressive multi-drug induction chemotherapy, progression during upfront therapy or with disease remaining after standard immunotherapy.
• International Neuroblastoma Risk Group Staging System (INRG) High Risk NB defined as one of the following:
• Any age with International Neuroblastoma Risk Group (INRG) Stage L2, MS, or M with MYCN amplification
• Age ≥ 547 days and INRG Stage M regardless of biologic features
• Any age initially diagnosed with INRG Stage L1 MYCN amplified NBL who have progressed to Stage M without systemic chemotherapy
• Age ≥ 547 days of age initially diagnosed with INRG Stage L1, L2, or MS who have progressed to Stage M without systemic chemotherapy
• Relapsed/refractory Sarcoma Subjects that have relapsed following standard of care therapy or having progressed during standard of care therapy. Standard of care therapy for sarcoma includes multi-agent chemotherapy with local control consisting of either surgery or radiation therapy.
• Measurable or evaluable disease, including at least one of the following:
• Measurable tumor by CT or MRI
• MIBG or PET that is positive for disease
• Bone Marrow biopsy/aspirate that is positive for disease
• Timing from prior therapy:
• Subjects must have fully recovered from the acute toxic effects of all prior anti- cancer therapy and be within the following timelines:
• Myelosuppressive chemotherapy: Must not have received within 2 weeks of enrollment onto this study.
• Small Molecule Inhibitors (anti-neoplastic agent): At least 2 weeks from the completion of therapy with a small molecule inhibitor.
• Immunotherapy: At least 4 weeks since the completion of any type of immunotherapy, e.g. tumor vaccines, CAR-T cells, anti-GD2 Monoclonal antibodies (ex. naxitamab, dinutuximab, etc.).

You may not qualify if…

• Investigational Drugs: Subjects who are currently receiving another investigational drug are excluded from participation.
• Anti-cancer Agents: Subjects who are currently receiving other anticancer agents are not eligible. Subjects must have fully recovered from the hematological and bone marrow suppression effects of prior therapy.
• Subjects who are currently receiving Vitamin K antagonists (warfarin).
• Subjects who are currently receiving the class of lipid-lowering medications HMG-CoA reductase inhibitors (statins).
• Infection: Subjects who have an uncontrolled infection are not eligible until the infection is judged to be well controlled in the opinion of the investigator.
• Subjects who, in the opinion of the investigator, may not be able to comply with the safety monitoring requirements of the study, or in whom compliance is likely to be suboptimal, should be excluded.
• Subjects with any clinically significant unrelated systemic illness (serious infections or significant cardiac, pulmonary, hepatic or other organ dysfunction), that in the opinion of the investigator would compromise the subject's ability to tolerate protocol therapy, put them at additional risk for toxicity or would interfere with the study procedures or results.
• Subjects with any of the following gastrointestinal disorders:
• Active malabsorption (e.g. short gut) syndrome.
• Uncontrolled diarrhea (excess of 4 stools/day)
• Gastritis, ulcerative colitis, Chron's disease or hemorrhagic coloproctitis
• History of gastric or small bowel surgery involving any extent of gastric or small bowel resection
• Lactating subjects are not eligible unless they have agreed to not breastfeed their infants. There is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the nursing subject with silmitasertib. (NOTE: breast milk cannot be stored for future use while the nursing subject is being treated on study.)
• Subjects with a history of any other malignancy.

Where it is running

• University of Alabama/Children's of Alabama — Birmingham, Alabama, United States (enrolling)
• Phoenix Children's Hospital — Phoenix, Arizona, United States (enrolling)
• UCSF Benioff Children's Hospital Oakland — Oakland, California, United States (enrolling)
• Rady Children's Hospital — San Diego, California, United States (enrolling)
• Connecticut Children's Hospital — Hartford, Connecticut, United States (enrolling)
• University of Florida — Gainesville, Florida, United States (enrolling)
• Nicklaus Children's Hospital — Miami, Florida, United States (enrolling)
• Arnold Palmer Hospital for Children — Orlando, Florida, United States (enrolling)
• All Children's Hospital Johns Hopkins Medicine — St. Petersburg, Florida, United States (enrolling)
• St. Joseph's Children's Hospital — Tampa, Florida, United States (enrolling)
• Kapiolani Medical Center for Women and Children — Honolulu, Hawaii, United States (enrolling)
• Norton Children's Research Institute/Affiliated with University of Louisville School of Medicine — Louisville, Kentucky, United States (enrolling)
• Children's Mercy Hospitals and Clinics — Kansas City, Missouri, United States (enrolling)
• Cardinal Glennon Children's Medical Center — St Louis, Missouri, United States (enrolling)
• Hackensack University Medical Center — Hackensack, New Jersey, United States (enrolling)
• Penn State Milton S. Hershey Medical Center and Children's Hospital — Hershey, Pennsylvania, United States (enrolling)
• Hasbro Children's Hospital — Providence, Rhode Island, United States (enrolling)
• Monroe Carrell Jr. Children's Hospital at Vanderbilt — Nashville, Tennessee, United States (enrolling)
• Children's Medical Center — Dallas, Texas, United States (enrolling)
• Primary Children's Hospital — Salt Lake City, Utah, United States (enrolling)
• Virginia Commonwealth University — Richmond, Virginia, United States (enrolling)
• UHC Sainte-Justine — Montreal, Quebec, Canada (enrolling)

Full record on ClinicalTrials.gov

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