SSGJ-705 Plus SSGJ-612 ± Chemotherapy in Advanced HER2-Expressing Solid Tumors

June 8, 2026 updated by: Shenyang Sunshine Pharmaceutical Co., LTD.

A Phase II Study of SSGJ-705 Plus SSGJ-612 ± Chemotherapy in Advanced HER2-Expressing Solid Tumors

This study was an open-label phase Ⅱ study to evaluate the safety and efficacy of SSGJ-705 Plus SSGJ-612 ± Chemotherapy in patients with advanced HER2-Expressing Solid Tumors.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This study includes 2 Parts: Part 1 (SSGJ-705 Plus SSGJ-612 for advanced cancer that have failed standard treatment), and Part 2 (SSGJ-705 or SSGJ-705 Plus SSGJ-612 in combination with chemotherapy for previously untreated advanced gastric cancer).

Study Type

Interventional

Enrollment (Estimated)

150

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

  • Name: Meifang Zheng, M.D.
  • Phone Number: +86-15258894828
  • Email: 794998553@qq.com

Study Locations

  • China
    • Zhejiang
      • Hangzhou, Zhejiang, China
        • Recruiting
        • Zhejiang Cancer Hospital
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Males and/or females over age 18
  • Histologically and/or cytologically documented local advanced or metastatic Colorectal adenocarcinoma (CRC), Urothelial Cancer (UC), Breast Cancer (BC), Biliary Tract Carcinoma(BTC), Gastric/Gastroesophageal Junction Cancer （G/GEJC) , etc.
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0-1.
  • Expected survival >3 months.
  • Signed informed consent form.

Exclusion Criteria:

  • Any remaining adverse events (AEs) > grade 1 from prior anti-tumor treatment as per Common Terminology Criteria for Adverse Events（CTCAE） v6. 0, with exception of hair loss, fatigue, and grade 2 peripheral neurotoxicity.
  • Pregnant or nursing women or women/men who are ready to give birth
  • symptomatic central nervous system metastasis.
  • Allergy to other antibody drugs or any excipients in the study drugs.
  • Inadequate organ or bone marrow function. The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Part 1
advanced cancer that have failed standard treatment
Drug: SSGJ-705
anti-PD-1 and anti-HER2 bispecifc antibody
Drug: SSGJ-612
anti-HER2 antibody
Experimental: Part 2
previously untreated advanced gastric cancer
Drug: SSGJ-612
anti-HER2 antibody
Drug: SSGJ-705 combined with chemotherapy
SSGJ-705 combined with chemotherapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Objective response rate (ORR)
Time Frame: 12 months
The primary efficacy end point
12 months
Incidence of Treatment-Emergent Adverse Events
Time Frame: 12 months
The primary safety end point
12 months
Severity of Treatment-Emergent Adverse Events
Time Frame: 12 months
The primary safety end point
12 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Progression-Free-Survival (PFS)
Time Frame: 24 months
The secondary efficacy end point
24 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Shenyang Sunshine Pharmaceutical Co., LTD.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 31, 2026

Primary Completion (Estimated)

June 30, 2027

Study Completion (Estimated)

October 31, 2028

Study Registration Dates

First Submitted

June 8, 2026

First Submitted That Met QC Criteria

June 8, 2026

First Posted (Actual)

June 15, 2026

Study Record Updates

Last Update Posted (Actual)

June 15, 2026

Last Update Submitted That Met QC Criteria

June 8, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • SSGJ-705-202

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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