COACH - Comparing Two Different Methods to Suppress Thyrotropin in Patients With Advanced Thyroid Cancer

NCT06790589 | Not Yet Recruiting Phase 2 DMC

• 1 other identifier: IIT-0033
• Study Type: interventional
• Target: 70
• Locations: 0 countries
• Sites: N/A

Brief Summary

Most thyroid cancers can be cured with surgery, sometimes with radioactive iodine therapy. However, some patients have cancer that has spread, and some have cancer that comes back after treatment. For those with remaining cancer, lowering TSH levels is recommended. This is because thyroid cancer growth can depend on TSH, so reducing TSH can lower the risk of cancer returning and slow its growth in patients with cancer that can't be surgically removed. International guidelines recommend keeping TSH levels as low as \<0.1 mU/L for patients with advanced thyroid cancer. This advice is based on past studies, but it hasn't been tested in a controlled way. One old study suggested that not lowering TSH enough could lead to more cancer relapses. Another study suggested that lowering TSH more could help prevent cancer from getting worse in high-risk patients. However, a recent study found no link between TSH levels and better outcomes, and the researchers suggested doing a new study to confirm if this practice is truly beneficial. Lowering TSH levels to \<0.1 mU/L using levothyroxine has been the standard of care for treating advanced thyroid cancer for a long time. The researchers would like to investigate whether using levothyroxine to keep TSH levels between 0.1 and 0.5 mU/L is just as safe and effective for cancer treatment as the current recommendation of keeping it below 0.1 mU/L. The researchers also believe this study can help set TSH suppression targets based on cancer type, reducing unnecessary side effects from too much TSH suppression while still achieving the same cancer treatment results. If the researchers can prove that keeping TSH levels between 0.1 and 0.5 mU/L is just as safe and effective as the standard of care practice, we can change our standard treatment approach. This would help reduce symptoms for our patients.

Conditions

Advanced Differentiated Thyroid Gland Carcinoma

Outcome Measures

Primary Outcomes (1)

• Proportion of Patients Who are Alive and Progression-free at One Year

  Progression will be defined using RECIST criteria 1.1 and will be based on radiological assessment only. Biomarkers (such as thyroglobulin) will not be considered given the significant limitations associated with these biomarkers in the setting of locally recurrent or metastatic differentiated thyroid cancer.

  up to 1 year after randomisation.

Secondary Outcomes (4)

• Mean Change of Symptom Burden (as assessed by ESAS)

  Screening, 6 months, 12 months, 18 months, 24 months

• Proportion of Patients Who are Alive and Progression-free at One Year According to Molecular Subtype (RAS-like vs BRAF-like cancers)

  1 year after randomization

• Median Progression-free Survival

  6 months, 12 months or death

• Rate of levothyroxine-related adverse events

  Screening to End of Study (2 years)

Study Arms (2)

Levothyroxine dosing with a target Thyrotropin (TSH) suppressed level of <0.1 mU/L

ACTIVE COMPARATOR

Levothyroxine oral tablet treatment daily with doses optimized to achieve an initial target TSH level of \<0.1 mU/L for a total of two years.

Drug: Levothyroxine Oral Tablet [Synthroid]

Levothyroxine dosing with a target Thyrotropin (TSH) suppressed level of 0.1 - 0.5 mU/L

EXPERIMENTAL

Levothyroxine oral tablet treatment daily with doses optimized to achieve an initial target TSH level of 0.1-0.5 mU/L for a total of two years.

Drug: Levothyroxine Oral Tablet [Synthroid]

Interventions

Levothyroxine Oral Tablet [Synthroid] DRUG

Round, colour coded, scored tablet debossed with "SYNTHROID" on one side and potency on the other side.

Levothyroxine dosing with a target Thyrotropin (TSH) suppressed level of 0.1 - 0.5 mU/L; Levothyroxine dosing with a target Thyrotropin (TSH) suppressed level of <0.1 mU/L

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Minimum age of 18 years, with no upper limit of age.
• ECOG 0-2
• Patients must be capable of providing consent to enrollment and willing to comply with study treatment and follow-up.
• Diagnosis of differentiated thyroid cancer (including papillary, follicular, oncocytic, and poorly differentiated subtypes) with advanced structural disease (defined as unresectable persistent/ recurrent locoregional disease and/or distant metastases).
• Residence within Alberta and referral to the Cross Cancer Institute in Edmonton, for consideration of anticancer therapy and/or follow-up.
• Absence of any condition hampering compliance with the study protocol and follow-up schedule; those conditions should be discussed with the patient before registration in the study.
• Patients of childbearing / reproductive potential should use highly effective birth control methods, as defined by the investigator, during the study treatment period and for a period of 30 days after the last dose of study drug. A highly effective method of birth control is defined as those resulting in low failure rate (i.e., less than 1% per year) when used consistently and correctly.
• Note: abstinence is acceptable if this is established and preferred contraception for the patient.
• Women of childbearing potential (WOCBP) must have a negative serum (or urine) pregnancy test at the time of screening. WOCBP is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy or bilateral salpingectomy) and is not postmenopausal. Menopause is defined as 12 months of amenorrhea in a woman over age 45 years in the absence of other biological or physiological causes. In addition, females under the age of 55 years must have a serum follicle stimulating hormone, (FSH) level \> 40 mIU/mL to confirm menopause.
• Females must not be breastfeeding (timeframe: during study treatment period and for a period of 30 days after the last dose of the study drug).
• Ability to obtain sufficient thyroid cancer tissue to conduct baseline NGS testing (could be fresh or archived tissue).

You may not qualify if:

• Recent acute coronary event (within 6 months of randomization).
• History of atrial fibrillation.
• Known hypersensitivity to levothyroxine.
• \- Treatment with other investigational drugs within 30 days prior to randomization.
• History of fragility fractures or established diagnosis of osteoporosis.

Sponsors & Collaborators

• AHS Cancer Control Alberta: lead

MeSH Terms

Interventions

Thyroxine

Intervention Hierarchy (Ancestors)

Thyroid Hormones; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Amino Acids, Aromatic; Amino Acids, Cyclic; Amino Acids; Amino Acids, Peptides, and Proteins

Study Officials

• Omar Abdelsalam

  Cross Cancer Institute

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Omar Abdelsalam

CONTACT

780-432-8290; omar.abdelsalam@ahs.ca

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: January 9, 2025
• First Posted: January 24, 2025
• Study Start (Estimated): December 1, 2026
• Primary Completion (Estimated): December 1, 2027
• Study Completion (Estimated): January 1, 2031
• Last Updated: February 6, 2026

Record last verified: 2026-02