A Study of DXC006 With Immune Checkpoint Inhibitors or Platinum for Small Cell Lung Cancer.

A Phase Ib/II Study to Evaluate the Safety and Efficacy of DXC006 for Injection Combined With Immune Checkpoint Inhibitors or Platinum-Based Agents in Patients With Small Cell Lung Cancer.

This is a Phase Ib/II, open-label clinical study designed to evaluate the safety, tolerability, preliminary anti-tumor activity, recommended Phase 2 dose (RP2D), pharmacokinetic (PK) characteristics, and immunogenicity of DXC006 in combination with an immune checkpoint inhibitor (ICI) or platinum-based chemotherapy in patients with small cell lung cancer (SCLC).

Study Overview

• Status: Not yet recruiting
• Conditions: Small Cell Lung Cancer
• Intervention / Treatment: Drug: DXC006; Drug: Toripalimab; Drug: Carboplatin; Drug: Cisplatin

• Study Type: Interventional
• Enrollment (Estimated): 200
• Phase: Phase 2; Phase 1

Contacts and Locations

• Study Contact: Name: Li Zhang, Doctoral degree; Phone Number: +86-020-87343565; Email: zhangli@sysucc.org.cn

Study Locations

• China
  • Guangdong
    • Guangzhou, Guangdong, China, 510060
      • Sun Yat-sen University Cancer Center
      • Contact: Li Zhang, Doctoral degree; Phone Number: +86-020-87343565; Email: zhangli@sysucc.org.cn

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Voluntarily signed informed consent and willingness to comply with the protocol requirements.
2. Male or female.
3. Age ≥18 years and ≤75 years.
4. Life expectancy ≥3 months.
5. Eastern Cooperative Oncology Group (ECOG) performance status score of 0-2.
6. Histologically or cytologically confirmed small cell lung cancer (SCLC).
7. Toxicity from prior anti-tumor therapy has resolved to ≤ Grade 1 as defined by NCI-CTCAE version 6.0 (except alopecia); peripheral neuropathy must have completely resolved.
8. Adequate hepatic, renal, coagulation, and cardiac function.
9. The participant and their spouse agree to use effective barrier or pharmacologic contraception (excluding rhythm method) from the time of signing the informed consent until 6 months after the last dose of study treatment.

Exclusion Criteria:

1. Histologically or cytologically confirmed combined SCLC, NSCLC, sarcomatoid carcinoma, or large cell neuroendocrine carcinoma.
2. Within 14 days prior to the first dose: underwent plasmapheresis; received systemic corticosteroid therapy at a daily dose >10 mg prednisone or equivalent (or equivalent anti-inflammatory activity) for more than 3 consecutive days (short-term use for prevention of contrast media allergy is permitted).
3. Prior allogeneic hematopoietic stem cell transplantation (HSCT) or history of solid organ transplantation.
4. Prior treatment with CD56-targeted therapy.
5. Symptomatic brain metastases or leptomeningeal metastases.
6. History of severe or life-threatening immune-related adverse events or infusion-related reactions (including permanent discontinuation of immuno-oncology therapy due to intolerance).
7. Active autoimmune disease or immunodeficiency, or a history of such conditions.
8. Evidence of significant cardiovascular risk.
9. Dyspnea or current requirement for continuous supplemental oxygen therapy, or current active pneumonitis or interstitial lung disease (except mild cases as determined by the investigator).
10. History of other primary malignancies, with the exception of malignancies that have been cured and have a very low risk of recurrence within 5 years, such as basal cell carcinoma or squamous cell carcinoma of the skin, or carcinoma in situ of the cervix or breast.
11. Severe non-healing wound, ulcer, or bone fracture; or major surgery within 28 days prior to dosing, or anticipated major surgery during the study period.
12. History of hypersensitivity to any component or excipient of DXC006, immune checkpoint inhibitors, or platinum-based chemotherapy.
13. Active hepatitis B (HBV-DNA above the upper limit of normal at the central laboratory or >1000 copies/mL); hepatitis C infection (positive hepatitis C antibody or positive HCV RNA PCR result).
14. Known positive serology for human immunodeficiency virus (HIV); active syphilis (patients with positive syphilis antibody only are eligible); potential active pulmonary tuberculosis (chest imaging within 3 months prior to the first dose suggestive of active tuberculosis infection).
15. Active bleeding within 30 days prior to screening, or risk of major gastrointestinal bleeding or hemoptysis as determined by the investigator; or hereditary bleeding tendency, coagulopathy, or bleeding symptoms requiring other medical intervention.
16. Severe arterial or venous thromboembolic events within 6 months prior to study drug administration, such as cerebrovascular accident (including transient ischemic attack), deep vein thrombosis, or pulmonary embolism.
17. Positive serum pregnancy test or currently breastfeeding female participants.
18. Active infection requiring medical therapy (CTCAE Grade ≥2); uncontrollable pleural effusion, ascites, or pericardial effusion requiring repeated drainage.
19. Administration of live attenuated vaccines within 28 days prior to the first dose.
20. Other conditions that, in the judgment of the investigator, may affect the patient's participation in the study.
21. Poor general condition, such as requirement for mechanical ventilation and/or intravenous catecholamine infusion, and/or severe neurological impairment, coma, and/or quadriplegia with complete loss of communication ability (deafness, blindness, aphasia); uncontrolled seizures; other psychiatric disorders that may affect study participation.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: DXC006 + ICI	Drug: DXC006; Participants receive DXC006 intravenously on Day 1 every 3 weeks.; Drug: Toripalimab; Participants receive Toripalimab intravenously on Day 1 every 3 weeks.
Experimental: DXC006 + Platinum(Carboplatin )	Drug: DXC006; Participants receive DXC006 intravenously on Day 1 every 3 weeks.; Drug: Carboplatin; Participants receive Carboplatin intravenously on Day 1 every 3 weeks (up to 6 cycles).
Experimental: DXC006 + Platinum(Cisplatin )	Drug: DXC006; Participants receive DXC006 intravenously on Day 1 every 3 weeks.; Drug: Cisplatin; Participants receive Cisplatin intravenously on Day 1 every 3 weeks (up to 6 cycles).

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Progression Free Survival (PFS)	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 2 year.
6-month progression-free survival rate	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 6 months.
Recommended Phase 2 Dose (RP2D)	Final RP2D confirmation upon completion of the Phase Ib (up to 12 months).
Measurement of objective response rate (ORR) per RECIST 1.1	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 2 year.
Measurement of disease control rate (DCR)	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 2 year.
Incidence of Adverse Events (AEs)	After first infusion of study drug, through study completion an average of 2 year.

Secondary Outcome Measures

Outcome Measure	Time Frame
Maximum observed serum or plasma concentration (Cmax)	Through study completion an average of 1 year.
Maximum serum drug time（Tmax）	Through study completion an average of 1 year.
Apparent volume of distribution(Vd)	Through study completion an average of 1 year.
Volume of distribution at steady state (Vss)	Through study completion an average of 1 year.
Terminal phase elimination half life (t½)	Through study completion an average of 1 year.
Area under the serum or plasma concentration time curve from 0 to the last measurable point (AUC0-t).	Through study completion an average of 1 year.
Area under the serum or plasma concentration time curve from 0 to infinity (AUC0-inf)	Through study completion an average of 1 year.
Clearance (CL)	Through study completion an average of 1 year.
Ctrough	Through study completion an average of 1 year.
Anti-drug antibodies (ADA)	Through study completion an average of 1 year.
Overall Survival (OS)	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 2 year.
Duration of response (DOR)	From date of enrollment until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 2 year.

Collaborators and Investigators

• Sponsor: Hangzhou DAC Biotechnology Co., Ltd.

Study record dates

Study Major Dates

• Study Start (Estimated): June 1, 2026
• Primary Completion (Estimated): June 1, 2028
• Study Completion (Estimated): December 30, 2030

Study Registration Dates

• First Submitted: April 24, 2026
• First Submitted That Met QC Criteria: April 24, 2026
• First Posted (Actual): April 30, 2026

Study Record Updates

• Last Update Posted (Actual): May 29, 2026
• Last Update Submitted That Met QC Criteria: May 27, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Respiratory Tract Diseases; Lung Diseases; Respiratory Tract Neoplasms; Thoracic Neoplasms; Lung Neoplasms; Carcinoma, Bronchogenic; Bronchial Neoplasms; Small Cell Lung Carcinoma; Organic Chemicals; Inorganic Chemicals; Chlorine Compounds; Nitrogen Compounds; Coordination Complexes; Platinum Compounds; Carboplatin; Cisplatin; toripalimab
• Other Study ID Numbers: DXC006-002

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