Differentiated Thyroid CancerPhase 3NCT04964284
rhTSH for Radioactive Iodine Remnant Ablation in Participants With Differentiated Thyroid Cancer (DTC)
A Phase 3 study testing rhTSH and Radioiodine (131I) in people with Differentiated Thyroid Cancer, run by Suzhou Zelgen Biopharmaceuticals Co.,Ltd at 1 site in China.
Trial summary
This study was conducted in patients with differentiated thyroid cancer who had undergone total/near-total thyroidectomy. After surgery patients were randomized to one of two methods of performing thyroid remnant ablation. One group of patients who took thyroid hormone medicine and were euthyroid [i.e. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Differentiated Thyroid Cancer
- What is being tested?
- rhTSH and Radioiodine (131I)
- Type of treatment
- Injection or infusion, Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 390 participants
- Where
- 1 siteChina
- Study dates
- 6 Oct 2021to 31 Jan 2026
- Phase
- Phase 3
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Subjects voluntarily sign the informed consent form (ICF).
- Age ≥ 18 years old, either male or female.
- Patients with diagnosed differentiated papillary or follicular thyroid carcinoma, including papillary-follicular variant, characterized as pT 1-3, N 0-1or Nx, and M0.
- Eastern Cooperative Oncology Group (ECOG) score of 0-2;
- Expected life expectancy is greater than 12 weeks;
- Patients with a total or near-total thyroidectomy within 12 months prior to randomized.
- Low iodine diet for two weeks prior to randomized.
Who cannot join
- patients with recent history of 131I whole body scan within 2 weeks prior to randomized.
- Pregnant or breast feeding women.
- patients with other malignancies (exception for in situ cervix uterine cancer, baso cellular skin cancer or breast cancer in remission)
- Subjects who are unsuitable to the trial in combination with other serious diseases, as identified by the investigator.
- Subjects who have participated in another clinical trial of a new drug or medical instrument within 1 months before screening.
Trial locations and contacts
1 site in 1 country.
China1 site
Peking Union Medical College Hospital
Beijing, Beijing Municipality, 100730
About this study
Official title: A Phase 3, Randomized, Open-Label, Multicenter, Parallel-Group Study to Evaluate the Efficacy and Safety of Recombinant Human Thyrotropin (rhTSH) for Radioactive Iodine (RAI) Remnant Ablation in Postoperative Participants With Differentiated Thyroid Cancer (DTC)
This study was conducted in patients with differentiated thyroid cancer who had undergone total/near-total thyroidectomy. After surgery patients were randomized to one of two methods of performing thyroid remnant ablation. One group of patients who took thyroid hormone medicine and were euthyroid [i.e. their thyroid stimulating hormone (TSH) levels are normal], and received injections of rhTSH (0.9 mg daily on two consecutive days) followed by oral radioiodine. The second group of patients did not take thyroid hormone medicine so that they were hypothyroid (i.e. their TSH levels were high), and were given oral radioiodine.
- Conditions
- Differentiated Thyroid Cancer
- Being tested
- rhTSH, Radioiodine (131I)
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
rhTSHBiological
Also called Recombinant human thyroid-stimulating hormone
rhTSH (0.9 mg) was administered intramuscularly (IM) once daily (qd) for 2 days. Twenty-four hours following the second dose of rhTSH
Radioiodine (131I)Radiation
Patients were given an ablative dose of 131I (30 mCi±1.5 mCi).
| Study group | Role | What they receive |
|---|---|---|
| rhTSH group | Experimental | Patients received thyroid hormone suppression therapy (Euthyrox) . rhTSH (0.9 mg) was administered intramuscularly (IM) once daily (qd) for 2 days. Twenty-four hours following the second dose of rhTSH, an ablative activity of 131I (30 mCi±1.5 mCi) was administered. Receives: Biological: rhTSH; Radiation: Radioiodine (131I) |
| Thyroid hormone withdrawal group | Experimental | After randomization, patients with thyroid hormone withdrawal therapy(i.e. Stop taking thyroid hormone for 14 days, and then monitor the level of thyroid-stimulating hormone every week). When TSH>30mU/L, an ablative activity of 131I (30 mCi±1.5 mCi) was administered. Receives: Radiation: Radioiodine (131I) |
What is being measured
The primary outcome is the main question the study is designed to answer.
The rate of successful postoperative thyroid ablation
Patients were considered successfully ablated if there was no visible thyroid bed uptake on the scan
Measured: 8 months later by a rhTSH stimulated radioiodine scan
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Jul 2021
- Study start6 Oct 2021
- Primary completion31 Jan 2026
- Study completion31 Jan 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Differentiated Thyroid CancerStudies of the same condition, open and under way.
- More trials run by Suzhou Zelgen Biopharmaceuticals Co.,LtdThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 390 participants (actual)
Sponsor and investigators
- Lead sponsor
- Suzhou Zelgen Biopharmaceuticals Co.,Ltd
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Yansong Lin, PhD, Principal investigator, Peking Union Medical College Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04964284
- Sponsor's protocol ID
- ZGTSH003
- Status last verified
- Sep 2026
- First submitted
- 6 Jul 2021
- Last updated
- 8 Sep 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 8 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 3, Randomized, Open-Label, Multicenter, Parallel-Group Study to Evaluate the Efficacy and Safety of Recombinant Human Thyrotropin (rhTSH) for Radioactive Iodine (RAI) Remnant Ablation in Postoperative Participants With Differentiated Thyroid Cancer (DTC)
- ClinicalTrials.gov ID
- NCT04964284
- Acronym / sponsor ID
- ZGTSH003
- Conditions
- Differentiated Thyroid Cancer
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 390 participants (actual)
- Lead sponsor
- Suzhou Zelgen Biopharmaceuticals Co.,LtdIndustry (pharma, biotech, devices)
- Study start
- 6 Oct 2021 (actual)
- Primary completion
- 31 Jan 2026 (actual)
- Study completion
- 31 Jan 2026 (actual)
- First posted
- 16 Jul 2021 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study was conducted in patients with differentiated thyroid cancer who had undergone total/near-total thyroidectomy. After surgery patients were randomized to one of two methods of performing thyroid remnant ablation. One group of patients who took thyroid hormone medicine and were euthyroid [i.e. their thyroid stimulating hormone (TSH) levels are normal], and received injections of rhTSH (0.9 mg daily on two consecutive days) followed by oral radioiodine. The second group of patients did not take thyroid hormone medicine so that they were hypothyroid (i.e. their TSH levels were high), and were given oral radioiodine.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| rhTSH group | Experimental | Biological: rhTSH, Radiation: Radioiodine (131I)Patients received thyroid hormone suppression therapy (Euthyrox) . rhTSH (0.9 mg) was administered intramuscularly (IM) once daily (qd) for 2 days. Twenty-four hours following the second dose of rhTSH, an ablative activity of 131I (30 mCi±1.5 mCi) was administered. |
| Thyroid hormone withdrawal group | Experimental | Radiation: Radioiodine (131I)After randomization, patients with thyroid hormone withdrawal therapy(i.e. Stop taking thyroid hormone for 14 days, and then monitor the level of thyroid-stimulating hormone every week). When TSH>30mU/L, an ablative activity of 131I (30 mCi±1.5 mCi) was administered. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (7 listed)
- Subjects voluntarily sign the informed consent form (ICF).
- Age ≥ 18 years old, either male or female.
- Patients with diagnosed differentiated papillary or follicular thyroid carcinoma, including papillary-follicular variant, characterized as pT 1-3, N 0-1or Nx, and M0.
- Eastern Cooperative Oncology Group (ECOG) score of 0-2;
- Expected life expectancy is greater than 12 weeks;
Key exclusion criteria (5 listed)
- patients with recent history of 131I whole body scan within 2 weeks prior to randomized.
- Pregnant or breast feeding women.
- patients with other malignancies (exception for in situ cervix uterine cancer, baso cellular skin cancer or breast cancer in remission)
- Subjects who are unsuitable to the trial in combination with other serious diseases, as identified by the investigator.
- Subjects who have participated in another clinical trial of a new drug or medical instrument within 1 months before screening.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| rhTSHAlso: Recombinant human thyroid-stimulating hormonerhTSH (0.9 mg) was administered intramuscularly (IM) once daily (qd) for 2 days. Twenty-four hours following the second dose of rhTSH | Biological | rhTSH group |
| Radioiodine (131I)Patients were given an ablative dose of 131I (30 mCi±1.5 mCi). | Radiation | Thyroid hormone withdrawal group, rhTSH group |
Primary outcome
The rate of successful postoperative thyroid ablation
Time frame: 8 months later by a rhTSH stimulated radioiodine scan
Patients were considered successfully ablated if there was no visible thyroid bed uptake on the scan
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Sep 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Yansong Lin, PhD principal investigator
Peking Union Medical College Hospital
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing rhTSH and Radioiodine (131I) in people with Differentiated Thyroid Cancer, run by Suzhou Zelgen Biopharmaceuticals Co.,Ltd at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 7 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 8 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
The rate of successful postoperative thyroid ablation (time frame: 8 months later by a rhTSH stimulated radioiodine scan). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Sep 2026; AzTrials last refreshed its copy on 8 Nov 2026.