Selpercatinib Pre-RAI in Patients With RET Fusion Thyroid Cancer (RAISE)

Recruitment Status
RECRUITING
(See Contacts and Locations)Verified March 2026 by Children's Hospital of Philadelphia
Sponsor
Children's Hospital of Philadelphia
Information Provided by (Responsible Party)
Children's Hospital of Philadelphia
Clinicaltrials.gov Identifier
NCT06458036
Other Study ID Numbers:
23-021524
First Submitted
June 9, 2024
First Posted
June 12, 2024
Last Update Posted
April 14, 2026
Last Verified
March 2026

ClinicalTrials.gov processed this data on April 2026. Link to the current ClinicalTrials.gov record .

History of Changes

Study Details

Study Description

This will be an open label, non-randomized study to evaluate the efficacy and safety of the combination of selpercatinib followed by 131I therapy for patients with RET fusion differentiated thyroid cancer. The primary Phase II objective will be to evaluate the pulmonary structural response rate at 18 months to the combination of selpercatinib given for 6-months followed by 131I therapy. This is exempt from Investigational New Drug requirements per the FDA.

Condition or DiseaseIntervention/Treatment
Differentiated Thyroid CancerPediatric CancerCancerCancer, Thyroid
Drug: Selpercatinib Monotherapy

Study Design

Study TypeInterventional
Actual Enrollment13 participants
Design AllocationN/A
Interventional ModelSingle Group Assignment
MaskingNone (Open Label)
Primary PurposeTreatment
Official TitleSelpercatinib to Enhance RAI Avidity in Children, Adolescents, and Young Adults With Newly Diagnosed Differentiated Thyroid Cancers Harboring RET Fusions
Study Start DateJuly 28, 2024
Actual Primary Completion Date4yrs 5mos from now
Actual Study Completion Date5yrs 5mos from now

Groups and Cohorts

Group/CohortIntervention/Treatment
Experimental: Selpercatinib Monotherapy with 131I Therapy
Patients will receive selpercatinib monotherapy for 6 months at the FDA-approved dose. Patients will receive 131I therapy after 6 months of selpercatinib. Selpercatinib will be continued for 5 days after RAI therapy and then patients will enter a wait and see period off treatment. Patients who experience disease progression at any point while on selpercatinib will proceed to 131I therapy and discontinue selpercatinib.
Drug: Selpercatinib Monotherapy
Patients will receive selpercatinib monotherapy for 6 months at the FDA-approved dose.

Outcome Measures

Primary Outcome Measures
  1. Number of patients with complete overall, pulmonary, structural, and biochemical response.
    Determine the overall, pulmonary, structural, and biochemical response rate to selpercatinib in patients with RET fusion differentiated thyroid cancer treated with 6 months of selpercatinib prior to 131I therapy
  2. Number of patients who survive without progression of disease after 5 years following protocol treatment.
    Determine the progression free survival to the combination of selpercatinib followed 6 months later 131I therapy from the initiation of selpercatinib therapy
  3. Proportion of all patients enrolled who show increased radioactive iodine avidity at 6 months following selpercatinib monotherapy.
    Determine the proportion of patients for whom oncogene-specific, targeted therapy increases tumor RAI-avidity.
  4. The incidence of adverse events and dose limiting toxicity with the combination of selpercatinib and 131I therapy, graded according to CTCAE v5.
    Determine the safety of the combination of selpercatinib given for 6-months followed by 131I therapy in patients with RET fusion differentiated thyroid cancer

Eligibility Criteria

Ages Eligible for Study(Child, Adult)
Sexes Eligible for StudyAll
Accepts Healthy VolunteersNo
Inclusion Criteria
1. Age 2-25 years, inclusive 2. Histologic diagnosis of a differentiated thyroid cancer, status post thyroidectomy and adequate local therapy (e.g., lymph node dissection as per standard of care) for metastatic disease in the neck in the opinion of the treating investigator 3. Anatomically evaluable disease on chest CT (Computed Tomography) meeting one of the following criteria (obtained within 90 days of enrollment): A. multiple (\> 10) noncalcified solid pulmonary nodules visible on CT and/or B. enlarging, discrete pulmonary nodules visible on CT of any number consistent with metastatic disease 4. Identification of an activating RET gene alteration (fusion or mutation). The RET alteration result should be generated from a laboratory with specific certifications (depending on country requirement) that clearly denotes the presence of a RET alteration without known kinase domain resistance mutation 5. Lansky/Karnofsky performance status \>50% 6. Adequate Organ Function A. Bone Marrow Function:
Peripheral absolute neutrophil count (ANC) ≥1500/µL
Platelet count ≥ 100,000/µL (transfusion independent, defined as not receiving platelet transfusions for at least 7 days prior to enrollment)
Hemoglobin ≥ 9.0 g/dL at baseline (may receive Red Blood Cell transfusions). B. Adequate Renal Function: Creatinine clearance or radioisotope Glomerular Filtration Rate (GFR) ≥ 70 mL/min/1.73 m2 or a maximum serum creatinine based on age/gender. C. Adequate Liver Function
Bilirubin (sum of conjugated + unconjugated) \< / = 1.5 x upper limit of normal (ULN) for age. Except participants with a documented history of Gilbert syndrome who must have a total bilirubin level of \<3.0X ULN
Alanine aminotransferase (ALT) \<2.5X ULN OR \<5x ULN if the liver has tumor involvement. For the purpose of this study, the ULN for ALT is 45 U/L.
Serum albumin ≥ 2 g/dL 7. Patient must have normal serum potassium, calcium, and magnesium levels (may be receiving supplements) 8. Men with partners of childbearing potential or women of childbearing potential must agree to use a highly effective contraceptive method during treatment with study drug and for 6 months following the last dose of study drug. Selpercatinib could impair fertility in males and females. Advise women not to breastfeed during treatment with selpercatinib and for 1 week following the final dose 9. Women of childbearing potential must have a negative pregnancy test (serum or urine, consistent with local regulations) documented within 24 hours prior to treatment with study drug and at least monthly while on study treatment
Exclusion Criteria
1. No prior systemic therapy for thyroid cancer, including RET inhibitors. Note: prior 131I is allowed. 2. Females who are pregnant or breastfeeding are excluded due to the potential risks of selpercatinib and radioactive iodine to the fetus/neonate. 3. Concurrent therapy: Patients currently receiving a strong CYP3A4 inducer or inhibitor are not eligible. Strong inducers or inhibitors of CYP3A4 should be avoided 14 days prior to treatment to the end of the study treatment. 4. Patients with clinically significant active cardiovascular disease, Torsades de pointes, or history of myocardial infarction within 6 months prior to planned start of study treatment or prolongation of the QT interval corrected for heart rate using Fridericia's formula (QTcF) \>470 msec. 5. Have clinically significant active malabsorption syndrome or other condition likely to affect gastrointestinal absorption of the drug. 6. Are taking a concomitant medication that is known to cause QTc prolongation. 7. Active hemorrhage or at significant risk for hemorrhage. 8. Uncontrolled hypertension (blood pressure greater than 140/90 in adults or greater than the 95% for height and gender in children). Use of anti-hypertensives to control blood pressure is permitted.

Contacts and Locations

Sponsors and CollaboratorsChildren's Hospital of Philadelphia
Locations
Children's Hospital of Philadelphia | Philadelphia Pennsylvania, United States, 19104St. Jude Children's Research Hospital | Memphis Tennessee, United States, 38105MD Anderson Cancer Center | Houston Texas, United States, 77030Seattle Children's Hospital | Seattle Washington, United States, 98105
Investigators
Principal Investigator: Theodore Laetsch, MD, Children's Hospital of Philadelphia