At a glance
ClinicalIndex Comparison RecordStandardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.
A Phase II Trial of Valproic Acid in Patients With Advanced Thyroid Cancers of Follicular Origin
In Brief
A Phase 2 clinical trial evaluating Valproic Acid and Liothyronine Sodium for Thyroid Neoplasm. Completed, enrolled 13 participants across 1 site.
Detailed Summary
Background: * Patients who have advanced thyroid cancer have a low long-term survival rate. These types of thyroid cancer do not respond well to conventional surgery or radiation, or to specific thyroid cancer treatments such as radioactive iodine treatment and thyroid hormone for thyroid stimulating hormone (TSH) suppression. * Valproic acid has long been approved as an anticonvulsant to treat seizures in patients with epilepsy. It has also been used to treat bipolar disorder. Recent studies have shown that valproic acid has promising effects in thyroid cancer treatment because it may help destroy cancer cells and help conventional treatments be more effective. However, valproic acid is not approved for thyroid cancer and is therefore an investigational drug. Objectives: * To determine whether valproic acid can inhibit tumor growth or induce tumor cell death. * To determine whether valproic acid can make tumor cells increase their uptake of radioiodine. Eligibility: \- Individuals at least 18 years of age who have advanced-stage thyroid cancer that is either unresponsive to conventional treatments or fails to absorb radioiodine. Design: * Eligible participants will continue on the standard thyroid hormone suppression therapy and begin receiving valproic acid for a total of 10 weeks. Participants will keep a study diary to record doses and side effects, and will have regular clinic visits to provide blood samples and receive additional valproic acid. * After 10 weeks, participants will have a Thyrogen scan to measure radioiodine uptake after valproic acid therapy. Tumor biopsies and blood samples will be taken at this time. * If there is increased radioiodine uptake on the scan, participants will have additional radioiodine therapy. * If there is no increased uptake on the scan, participants will continue on valproic acid for 7 more weeks. After 16 total weeks of treatment, additional blood samples and scans will be taken. Participants may continue to take valproic acid if the thyroid cancer appears to be responding to the treatment. * Follow-up visits will be scheduled at 3, 6, 9 (for patients continuing on valproic acid only), and 12 months.
Study Details
Timeline
Interventions
Week 1: (Days 1-3): Valproic acid - 500 mg every evening (Day 4-7): Valproic acid - 500 mg twice daily (morning and evening) Weeks 2 through 10: Valproic acid 500 mg every morning and 1000 mg every evening
Patients who exhibit an increased radioiodine uptake on Thyrogen scan post valproic acid therapy at week 10. Begin Cytomel for 4 weeks (25 micrograms twice a day)