Sintilimab Combined With Tafolecimab and Chemotherapy as First-Line Treatment for Extensive-Stage Small Cell Lung Cancer

Not Applicable

Not yet recruiting

• Conditions: Extensive-stage Small Cell Lung Cancer (ES-SCLC); Extensive Stage Lung Small Cell Cancer; Extensive-Stage Small-Cell Lung Cancer; Extensive Disease Small Cell Lung Cancer
• Interventions: Drug: Tafolecimab; Drug: Sintilimab (approved); Drug: Etoposide; Drug: Carboplatin / Cisplatin

• Registration Number: NCT07061535
• Lead Sponsor: Second Affiliated Hospital, School of Medicine, Zhejiang University

Brief Summary

This is a single arm, multi-center clinical trial. The goal of this clinical trial is to evaluate the efficacy, safety and biomarkers of Tafolecimab combined with Sintilimab and Chemotherapy as first-line treatment for patients with extensive-stage small cell lung cancer (ES-SCLC). Tafolecimab is a recombinant fully humanized monoclonal antibody against proprotein convertase subtilisin/kexin type 9 (PCSK-9), which can reduce low-density lipoprotein-C levels and increase the expression level of major histocompatibility complex class I (MHC-I) on tumor cells. Sintilimab is a fully humanized IgG4 monoclonal antibody targeting programmed cell death protein 1 (PD-1).

Detailed Description

Eligible patients will receive 4 cycles of Tafolecimab (300mg, sc, d1, Q3W) in combination with Sintilimab (200mg, iv, d1, Q3W), along with etoposide and either carboplatin (AUC 5 mg/mL/min) or cisplatin (75 mg/m2) administered intravenously on days 1, 2, and 3 of each 3-week cycle for up to 4 to 6 cycles. Subsequently, patients will receive maintenance therapy with Sintilimab and Tafolecimab until disease progression, the occurrence of intolerable toxicities, or the treatment duration reaches 2 years. If the investigator assesses potential evidence of clinical benefit, continuing treatment after disease progression is permitted.

PRIMARY OBJECTIVES:

I. To evaluate the progression-free survival (PFS) of Tafolecimab combined with Sintilimab and chemotherapy as first-line treatment regimens for patients with extensive-stage small cell lung cancer (ES-SCLC).

SECONDARY OBJECTIVES:

I. To evaluate the safety of of Tafolecimab combined with Sintilimab and chemotherapy as first-line treatment regimens for patients with ES-SCLC.

II. To evaluate the PFS rate, objective response rate (ORR), disease control rate (DCR), duration of response (DOR), overall survival (OS) rate and OS of Tafolecimab combined with Sintilimab and chemotherapy as first-line treatment regimens for patients with ES-SCLC.

TERTIARY OBJECTIVES:

I. To evaluate whether Tafolecimab combined with Sintilimab and chemotherapy as first-line treatment for patients with ES-SCLC could upregulate the expression of MHC-I on SCLC tumor cells.

II. To explore tissue and liquid biopsy biomarkers that may be predictive of response or primary resistance to Tafolecimab combined with Sintilimab and chemotherapy.

Study Timeline

• Status Verified: 2025-06
• Study First Submitted: 2025-07-02
• Study First Submitted QC: 2025-07-02
• Last Update Submitted: 2025-07-02
• Study First Posted: 2025-07-11
• Last Update Posted: 2025-07-11
• Study Start: 2025-08-01
• Primary Completion: 2027-08-01
• Study Completion: 2027-08-01

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Age ≥18 years, ECOG performance status 0-1;
• Histologically or cytologically confirmed extensive-stage small cell lung cancer (ES-SCLC) according to Veterans Administration Lung Study Group criteria;
• Previously not receiving systemic treatment for ES-SCLC;
• Greater than or equal to 1 measurable lesion exists according to RECIST v1.1;
• Expected survival >= 12 weeks;
• Adequate organ system functions (no blood transfusion or component blood use within 14 days before testing).

Key

Exclusion Criteria

• Previously receiving systemic anti-tumor therapy for ES-SCLC;
• Combined SCLC (mixed SCLC and NSCLC histological types) or transformed SCLC confirmed by histological or cytological examination;
• Receiving other investigational drugs or participated in other interventional clinical studies within 4 weeks before signing the informed consent form;
• Receiving systemic immunostimulant treatment within 4 weeks before enrollment;
• Active central nervous system (CNS) metastases (asymptomatic patients with stable lesions allowed);
• Severe cardiovascular disease;
• Severe chronic/active infections requiring systemic antibacterial, antifungal or antiviral treatment within 2 weeks before enrollment;
• Active hepatitis B virus (HBV)/ hepatitis C virus (HCV)/ human immunodeficiency virus (HIV) infection;
• Active autoimmune diseases, a history of interstitial lung disease, or other uncontrolled systemic diseases;
• Pregnancy or lactation;
• Having a disease that requires systemic corticosteroids or other immunosuppressants to be treated within ≤14 days before enrollment;
• Requiring at least monthly or more frequent drainage of pleural and/or pericardial or peritoneal effusion;
• Using attenuated live vaccines, or planned to receive attenuated live vaccines within 28 days before enrollment;
• Known to be allergic to Sintilimab or Tafolecimab or its excipients, having a history of severe allergic reaction to any monoclonal antibody, or having a history of allergy to cisplatin, carboplatin or etoposide;
• Toxicity caused by previous anti-cancer treatment has not recovered to baseline or stable state at the time of enrollment;
• Creatinine clearance rate < 60 mL/min (cisplatin) or < 45 mL/min (carboplatin)
• Uncontrolled or symptomatic hypercalcemia.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Tafolecimab + Sintilimab + Chemotherapy	Tafolecimab	Eligible patients will receive 4 cycles of Tafolecimab (300 mg, sc, d1, Q3W) in combination with Sintilimab (200 mg, iv, d1, Q3W), along with etoposide and either carboplatin (AUC 5 mg/mL/min) or cisplatin (75 mg/m2) for up to 4 to 6 cycles. Subsequently, they will receive maintenance therapy with Sintilimab and Tafolecimab until disease progression, the occurrence of intolerable toxicities, or the completion of 2 years of treatment. Etoposide (100 mg/m2) will be administered intravenously on days 1, 2, and 3 of each 3-week cycle, while carboplatin or cisplatin will be given intravenously on day 1 of each 3-week cycle.
Tafolecimab + Sintilimab + Chemotherapy	Sintilimab (approved)	Eligible patients will receive 4 cycles of Tafolecimab (300 mg, sc, d1, Q3W) in combination with Sintilimab (200 mg, iv, d1, Q3W), along with etoposide and either carboplatin (AUC 5 mg/mL/min) or cisplatin (75 mg/m2) for up to 4 to 6 cycles. Subsequently, they will receive maintenance therapy with Sintilimab and Tafolecimab until disease progression, the occurrence of intolerable toxicities, or the completion of 2 years of treatment. Etoposide (100 mg/m2) will be administered intravenously on days 1, 2, and 3 of each 3-week cycle, while carboplatin or cisplatin will be given intravenously on day 1 of each 3-week cycle.
Tafolecimab + Sintilimab + Chemotherapy	Etoposide	Eligible patients will receive 4 cycles of Tafolecimab (300 mg, sc, d1, Q3W) in combination with Sintilimab (200 mg, iv, d1, Q3W), along with etoposide and either carboplatin (AUC 5 mg/mL/min) or cisplatin (75 mg/m2) for up to 4 to 6 cycles. Subsequently, they will receive maintenance therapy with Sintilimab and Tafolecimab until disease progression, the occurrence of intolerable toxicities, or the completion of 2 years of treatment. Etoposide (100 mg/m2) will be administered intravenously on days 1, 2, and 3 of each 3-week cycle, while carboplatin or cisplatin will be given intravenously on day 1 of each 3-week cycle.
Tafolecimab + Sintilimab + Chemotherapy	Carboplatin / Cisplatin	Eligible patients will receive 4 cycles of Tafolecimab (300 mg, sc, d1, Q3W) in combination with Sintilimab (200 mg, iv, d1, Q3W), along with etoposide and either carboplatin (AUC 5 mg/mL/min) or cisplatin (75 mg/m2) for up to 4 to 6 cycles. Subsequently, they will receive maintenance therapy with Sintilimab and Tafolecimab until disease progression, the occurrence of intolerable toxicities, or the completion of 2 years of treatment. Etoposide (100 mg/m2) will be administered intravenously on days 1, 2, and 3 of each 3-week cycle, while carboplatin or cisplatin will be given intravenously on day 1 of each 3-week cycle.

Primary Outcome Measures

Name	Time	Method
Progression-free Survival as Assessed by RECIST v1.1	From enrollment to the end of treatment at 12 months	Progression-free survival (PFS) refers to the period from the start of combined treatment until any objectively recorded tumor progression occurs or until the patient's death (for patients lost to follow-up, it is the last follow-up time; for patients still alive at the end of the study, it is the date of the follow-up termination) as assessed by RECIST v1.1.

Secondary Outcome Measures

Name	Time	Method
Objective Response Rate as Assessed by RECIST v1.1	From enrollment to the end of treatment at 12 months	Objective response rate (ORR) refers to the proportion of patients whose tumors have shrunk to a certain extent and maintained that state for a certain period of time, including cases of complete response (CR) and partial response (PR) as assessed by RECIST v1.1.
Progression-free Survival Rate as Assessed by RECISIT v1.1	From enrollment to the end of treatment at 6 months and 12 months	6-month and 12-month progression-free survival rate refers to the proportion of patients whose time from the start of treatment to any objectively recorded tumor progression or patient death is equal to or greater than 6 months and 12 months.
Overall Survival Rate as Assessed by RECISIT v1.1	From enrollment to the end of treatment at 12 months and 24 months	12-month and 24-month overall survival rate refers to the proportion of patients whose time from the first administration of the drug to any cause of death was greater than or equal to 12 months and 24 months.
Disease Control Rate as Assessed by RECISIT v1.1	From enrollment to the end of treatment at 12 months	Disease control rate refers to the proportion of patients whose tumors have shrunk to a certain extent and maintained that state for a certain period of time. It includes cases of complete response (CR), partial response (PR), and stable disease (SD).
Duration of Response as Assessed by RECISIT v1.1	From enrollment to the end of treatment at 12 months	Duration of response refers to the duration from the time when the patient's condition is first confirmed as response (CR or PR) until the first record of progressive disease (PD) or death due to any reason (whichever occurs first).
Percentage of Participants with Treatment-Related Adverse Events as Assessed by NCI-CTCAE v5.0	From enrollment to the end of treatment at 12 months
Overall survival as Assessed by RECISIT v1.1	From enrollment to the end of treatment at 24 months	The time period from the first administration of the drug until death due to any cause (for patients who were lost to follow-up, it is the last follow-up time; for patients who were still alive at the end of the study, it is the date of the follow-up conclusion).

Trial Locations

Locations (5)

Hunan Cancer Hospital/the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University; 🇨🇳 Changsha, Hunan, China

Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Science; 🇨🇳 Jinan, Shandong, China

Department of Thoracic Medical Oncology, Zhejiang Cancer Hospital, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences; 🇨🇳 Hangzhou, Zhejiang, China

First Affiliated Hospital, School of Medicine, Zhejiang University; 🇨🇳 Hangzhou, Zhejiang, China

Second Affiliated Hospital, School of Medicine, Zhejiang University; 🇨🇳 Hangzhou, Zhejiang, China