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RecruitingLast updated: 19 August 2026

POLARIS-3: Targeted therapy with olverembatinib for people with SDH-deficient gastrointestinal stromal tumours (GIST)A Single-Arm Registrational Phase III Study of Olverembatinib in the Treatment of Patients With SDH-Deficient Gastrointestinal Stromal Tumor (POLARIS-3)

Trial purpose

Medical clipboardCancer treatment

Tumor type

Sarcoma Cancers Sarcoma

Age

People12+

Trial acronym

POLARIS-3

Clinical summary

Summary

This study is testing a targeted therapy called olverembatinib in people with SDH-deficient gastrointestinal stromal tumours (GIST), a rare type of cancer that develops in the digestive system.

The study aims to find out how well olverembatinib works and how safe it is in people whose cancer has progressed after, or could not tolerate, at least one previous systemic treatment.

Everyone who joins the study will receive olverembatinib. The medication is taken by mouth with food once every second day in 28-day treatment cycles.

Researchers will monitor:

  • How well the treatment controls the cancer
  • How long the cancer remains under control before it grows or spreads
  • The overall clinical benefit of treatment
  • Any side effects experienced during treatment

Conditions

This trial is treating people with gastrointestinal stromal tumours (GIST) with a loss of SDHB expression

Eligibility

Inclusion

  1. Histologically and/or cytologically confirmed GIST, immunohistochemistry with loss of SDHB expression, and failure of at least one prior systemic therapy. Defined as disease progression or intolerable as judged by the investigator.
  2. Must have at least one measurable target lesion.
  3. ECOG≤ 2.
  4. Expected survival of at least 3 months.
  5. Adequate organ function.
  6. Negative serum pregnancy test result for women of childbearing potential within 7 days prior to taking the first dose of study drug.
  7. Males, women of childbearing potential, as well as their partners, voluntarily take effective contraceptive measures as specified in the protocol from the time of signing the informed consent form until at least 30 days after the last dose of study drug.
  8. Prior to initiation of any screening or study-specific procedures, the patient or his/her guardian is able to understand and voluntarily sign an informed consent form approved by the Ethics Committee in writing, voluntarily and able to complete the study procedures and follow-up examinations.

Exclusion

  1. Received antitumor cytotoxic chemotherapy, radiotherapy, biologic drug therapy, immunotherapy, or other investigational agents within 14 days or less than 5 times the half-life prior to the first dose.
  2. Tyrosine kinase inhibitor (TKI) therapy within 7 days prior to the first dose.
  3. Use of drugs that have drug interactions with the study drug within 7 days prior to the first dose.
  4. Adverse events due to prior treatment have not recovered (> NCI CTCAE v5.0 Grade 1).
  5. Absorption disorder syndrome or other conditions that affect the absorption of oral medications.
  6. With clinically significant, uncontrolled or active cardiovascular disease or thrombotic disease.
  7. Poorly controlled hypertension after hypertension medication.
  8. Severe cardiovascular and cerebrovascular diseases during previous use of TKIs.
  9. Uncontrolled Hyperlipidemia.
  10. Major surgery, open biopsy, or major traumatic injury within 14 days prior to initiation of study drug.
  11. With brain metastases.
  12. Other malignancies within 2 years.
  13. Uncontrolled systemic active fungal, bacterial, and/or viral infections.
  14. Female patients who are pregnant or lactating, or female patients who are expecting to become pregnant within the period of this study.
  15. Any symptoms or disease of the patient, in the judgment of the investigator or sponsor, that may jeopardize their safety or interfere with the safety evaluation of the investigational drug.

Inclusion

  • You have had treatment but your cancer has gotten worse or has not responded to the treatment you have been given.
  • You are able to swallow medication by mouth.
  • You have had a certain type of treatment or surgical procedure.

Exclusion

  • You have been diagnosed with a prior or secondary type of cancer.
  • You have certain types of non-cancer medical conditions.
  • You have had certain treatments, surgical procedures or drugs.
Message

Clinical trials have complex eligibility criteria, and other criteria may apply for this trial. Ask your doctor about whether this trial could be right for you.

Participating hospitals

Recruiting hospitals

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More information

Trial Identifiers

Information on this page is partially produced from ClinicalTrials.gov *. View further details about this trial on the registry via the links below:

Trial sponsor

Ascentage Pharma Group Inc.

Scientific Title

A Single-Arm Registrational Phase III Study of Olverembatinib in the Treatment of Patients With SDH-Deficient Gastrointestinal Stromal Tumor (POLARIS-3)

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