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Relapsed/Refractory Multiple MyelomaPhase 3NCT06508983

A Clinical Study Comparing SG301 Plus Pomalidomide and Dexamethasone to Placebo Plus Pomalidomide and Dexamethasone in Relapsed or Refractory Multiple Myeloma Patients

A Phase 3 study testing SG301 Injection, pomalidomide and dexamethasone in people with Relapsed/Refractory Multiple Myeloma, run by Hangzhou Sumgen Biotech Co., Ltd. at 12 sites in China.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

The purpose of this study is to evaluate the effects of the addition of SG301 injection to pomalidomide and dexamethasone in subjects with relapsed or refractory multiple myeloma. Read more about this study

Who is it for?
Ages 18 to 75 years
Conditions the study is for
Relapsed/Refractory Multiple Myeloma
What is being tested?
SG301 Injection, pomalidomide and dexamethasone
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
360 participants
Where
12 sitesChina
Study dates
14 Jun 2024to 31 Mar 2028
Phase
Phase 3
Are there results?
Not yet: the study is under way

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 to 75 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Understand and voluntarily sign the informed consent form (ICF).
  • Males and females aged 18-75 years (inclusive)
  • Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0, 1 or 2
  • Expected survival time of ≥3 months.
  • Subjects had a documented diagnosis of multiple myeloma with evidence of measurable disease.
  • Subjects had received at least 1 prior lines of anti-myeloma therapy, which must include lenalidomide and a proteasome inhibitor (bortezomib, carfilzomib or ixazomib) given alone or in combination.
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  • Subjects must have documented evidence of PD on or after the last regimen.
  • Adequate function of vital organs
  • Women of childbearing potential (WOCBP) must agree to follow instructions for methods of contraception for 4 weeks before the start of study treatment, for the duration of study treatment, and for 6 months after cessation of SG301 or 4 weeks after cessation of pomalidomide, whichever is longer. WOCBP must have 2 negative serum or urine pregnancy tests, one 10-14 days prior to start of study treatment and one 24 hours prior to the start of study treatment.

Who cannot join

  • Primary refractory multiple myeloma defined as participants who had never achieved at least a minimal response (MR) with any treatment during the disease course.
  • Bone independent extramedullary disease at screening.
  • Subjects who are primary refractory to a prior CD38 monoclonal antibody therapy.
  • Previous exposure to pomalidomide.
  • Subject has received chemotherapy or small molecule antitumor therapy within 2 weeks or 5 pharmacokinetic half-lives of the treatment, whichever is shorter, before the first dose of study treatment;
  • Subject has received tumor biotherapy within 4 weeks or 5 pharmacokinetic half-lives of the treatment, whichever is shorter, before the first dose of study treatment;
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  • Subject has received investigational agents within 4 weeks or 5 pharmacokinetic half-lives of the treatment, whichever is shorter (but not less than 14 days), before the first dose of study treatment;
  • Active hepatitis B, or C.
  • Known HIV infection.
  • Known active tuberculosis or positive treponema pallidum antibodies.
  • Subjects with clinical significant organ dysfunction that does not meet the study needs.
  • Previous allogenic stem cell transplant or autologous stem cell transplantation (ASCT) before the first dose of study treatment.
  • Known allergy to any component of the investigational medicinal product.
  • Any concurrent medical or psychiatric condition or disease (eg, active systemic infection, uncontrolled diabetes, acute diffuse infiltrative pulmonary disease) that is likely to interfere with the study procedures or results or that, in the opinion of the investigator, would constitute a hazard for participating in this study.

Trial locations and contacts

12 sites in 1 country. Contact the study team or a site near you to ask about taking part.

12 sites in 1 country

China12 sites, 12 recruiting
  • Beijing Chaoyang Hospital of Capital Medical University

    Beijing, Beijing Municipality, 100024

    Wenming Chen, Doctor

    Ying Tian

    Recruiting
  • Guangzhou First People's Hospital

    Guangzhou, Guangdong, 510000

    Shunqing Wang

    Wei Zhou

    Not yet recruiting
  • Sun Yat-sen University Cancer Center

    Guangzhou, Guangdong, 510000

    Zhongjun Xia

    Xiaoqin Chen

    Not yet recruiting
  • The Second Affiliated Hospital Zhejiang University School Of Medicine

    Hangzhou, Zhejiang, 310056

    Wenbin Qian

    Xuzhao Zhang

    Recruiting
  • First Affiliated Hospital of Henan University of Science and Technology

    Luoyang, Henan, 471000

    Haiping Yang

    Bingke Zhu

    Recruiting
  • The First Affiliated Hospital Of Soochow University

    Suzhou, Jiangsu, 215006

    ZhengZheng Fu

    Yingying Zhai

    Recruiting
  • Shanxi Provincial Hospital

    Taiyuan, Shanxi, 030000

    Liping Su

    Jingrong Wang

    Recruiting
  • Tianjin Cancer University Airport Hospital

    Tianjin, Tianjin Municipality, 300060

    Yafei Wang

    Zhiying Zhang

    Recruiting
  • Tianjin Medical University Cancer Institute & Hospital

    Tianjin, Tianjin Municipality, 300060

    Yafei Wang

    Haifeng Zhao

    Not yet recruiting
  • Union Hospital, Tongji Medical College, Huazhong University of Science and Technology

    Wuhan, Hubei, 430000

    Chunyan Sun

    Fei Zhao

    Recruiting
  • The Second Affiliated Hospital Of Xi an Jiaotong University (Xibei Hospital)

    Xi’an, Shanxi, 710000

    Wanhong Zhao

    Fangxia Wang

    Recruiting
  • Henan Cancer Hospital

    Zhengzhou, Henan, 450000

    Baijun Fang

    Yuzhang Liu

    Recruiting

Other trials in China

About this study

Official title: A Phase 3 Randomized, Placebo-controlled, Double-blind, Multicenter Study Comparing SG301 in Combination With Pomalidomide and Dexamethasone Versus Placebo in Combination With Pomalidomide and Dexamethasone in Patients With Relapsed or Refractory Multiple Myeloma

The purpose of this study is to evaluate the effects of the addition of SG301 injection to pomalidomide and dexamethasone in subjects with relapsed or refractory multiple myeloma.

Read the detailed description

This is a randomized, placebo-controlled, double-blind, multicenter phase III clinical study to compare SG301 injection in combination with pomalidomide and dexamethasone versus placebo in combination with pomalidomide and dexamethasone in patients with relapsed or refractory multiple myeloma who have received at least 1 prior treatment regimen with both lenalidomide and a proteasome inhibitor and have demonstrated disease progression.

This study consists of two stages. Stage 1 is the dose exploration stage to confirm the recommended stage 2 dose of SG301 injection in combination with pomalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma. Stage 2 is the randomized controlled stage of SG301 injection in combination with pomalidomide and dexamethasone versus placebo in combination with pomalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma.

Being tested
SG301 Injection, SG301 placebo, pomalidomide, dexamethasone
Medical subject headings
Multiple Myeloma

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • SG301 InjectionDrug

    Dosage form: solution for infusion Route of administration: intravenous Frequency: weekly intervals (QW) for 8 weeks, then every 2 weeks (Q2W) thereafter.

  • SG301 placeboDrug

    Dosage form: solution for infusion Route of administration: intravenous Frequency: weekly intervals (QW) for 8 weeks, then every 2 weeks (Q2W) thereafter.

  • pomalidomideDrug

    Dosage form: capsule Route of administration: oral Dosage: 4 mg Frequency: once daily on Days 1 through 21 of each 28-day cycle.

  • dexamethasoneDrug

    Dosage form: tablets or solution for infusion Route of administration: oral or intravenous Dosage: 40 mg (participants with BMI < 18.5 kg/m2 received 20 mg dexamethasone) Frequency: once daily on Day 1, 8, 15, 22 of each 28-day treatment cycle.

Study groups in NCT06508983
Study groupRoleWhat they receive
SG301 Injection in combination with pomalidomide and dexamethasoneExperimentalParticipants will receive SG301 Injection in combination with pomalidomide and dexamethasone. Treatment cycles have a duration of 28 days. Participants will continue to receive study treatment until confirmed disease progression, unacceptable toxicity, or any other treatment discontinuation criteria are met.
Receives: Drug: SG301 Injection; Drug: pomalidomide; Drug: dexamethasone
Placebo in combination with pomalidomide and dexamethasonePlacebo comparatorParticipants in Stage 2 who randomized to this arm will receive placebo in combination with pomalidomide and dexamethasone. Treatment cycles have a duration of 28 days. Participants will continue to receive study treatment until confirmed disease progression, unacceptable toxicity, or any other treatment discontinuation criteria are met.
Receives: Drug: SG301 placebo; Drug: pomalidomide; Drug: dexamethasone

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Adverse events (stage 1)

    AEs, DLTs, laboratory abnormality, Vital signs or ECG abnormalities, ECOG scores, abnormal physical examination

    Measured: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.

  2. Recommended stage 2 dose of SG301 (Stage 1)

    Recommended stage 2 dose of SG301 will be determined based on the DLTs and safety data

    Measured: Up to approximately 6 months.

  3. Progression Free Survival (Stage 2)

    Comparison of Progression Free Survival between treatment arms (SG301/Pomalidomide/Dexamethasone vs Placebo/Pomalidomide/Dexamethasone).

    Measured: From baseline through the end of study. Assessed every 4 weeks after randomization until C19D1, and every 8 weeks thereafter until disease progression (IMWG criteria) or death whichever occurs first, assessed up to approximately 4 years.

Secondary outcomes (9)
  1. Pharmacokinetics (PK): AUC

    The area under the curve (AUC) of serum concentration of the drug after the administration.

    Measured: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.

  2. Pharmacokinetics (PK): Cmax

    Cmax to maximum drug concentration.

    Measured: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.

  3. Pharmacokinetics (PK):limination half-life (T1/2)

    Limination half-life (T1/2) of the drug after administration.

    Measured: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.

  4. Immunogenicity endpoints

    Anti-SG301 antibody, neutralizing antibody (to be detected only in case of the presence of anti-SG301 antibody.

    Measured: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.

  5. Overall Response Rate

    ORR (IMWG criteria): percentage of participants with stringent complete response(sCR), complete response (CR), very good partial response (VGPR), and partial response (PR) as best overall response

    Measured: From baseline through the end of study. It is measured from the start of treatment until disease progression, death, initiation of further anti-myeloma treatment, or cut-off date, whichever occurs first, assessed up to approximately 4 years.

  6. Percentage of Participants With Very Good Partial Response (VGPR) or Better (≥VGPR Rate)

    ≥VGPR Rate (IMWG criteria): percentage of participants with stringent complete response(sCR), complete response (CR), and very good partial response (VGPR) as best overall response.

    Measured: From baseline through the end of study. It is measured from the start of treatment until disease progression, death, initiation of further anti-myeloma treatment, or cut-off date, whichever occurs first, assessed up to approximately 4 years.

  7. Duration of Response

    Duration of response will be restricted to subjects who achieve a best objective response of PR or better.

    Measured: From baseline through the end of study. It is measured from the time that the criteria for objective response are first met until the date of a progression event, assessed up to approximately 4 years.

  8. Overall Survival

    Overall survival is defined as the time, in months, from randomization to the date of death from any cause.

    Measured: From baseline through the end of study, assessed up to approximately 4 years.

  9. Percentage of Participants With Minimal Residual Disease (MRD)

    MRD was assessed by next-generation sequencing in bone marrow samples from participants who achieved CR or sCR, to determine the depth of response at the molecular level.

    Measured: From baseline through the end of study. It is measured from the time that the criteria for CR are first met until the date of a progression event, assessed up to approximately 4 years.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted19 Jul 2024
  2. Study start14 Jun 2024
  3. Primary completion31 Mar 2027 (estimated)
  4. Study completion31 Mar 2028 (estimated)

Resources

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
Model description
This Study consists of Stage 1 and Stage 2. Stage 1 :Single group. Subjects will receive SG301 Injection in combination with pomalidomide and dexamethasone. Stage 2:Parallel. Subjects will be randomized to receive SG301 Injection in combination with pomalidomide and dexamethasone or placebo in combination with pomalidomide and dexamethasone.
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
360 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06508983
Sponsor's protocol ID
CSG-301-301
Status last verified
Jul 2026
First submitted
5 Jul 2024
Last updated
10 Jul 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing SG301 Injection, pomalidomide and dexamethasone in people with Relapsed/Refractory Multiple Myeloma, run by Hangzhou Sumgen Biotech Co., Ltd. at 12 sites 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 9 inclusion and 14 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: looking for participants now, as of the sponsor's last update on 10 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 12 sites 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. Some participants in this study may receive a placebo. 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?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Jing Yang (+86 010-56315401, yangjing@sumgenbio.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Adverse events (stage 1) (time frame: From date of first dose of study intervention through approximately 30 days after last study intervention administration, assessed up to approximately 4 years.). The study lists 3 primary outcomes in all. 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 10 Jul 2026.

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