Tislelizumab Combined With Chemotherapy Followed by Thoracic Consolidation Radiotherapy in the First-line Treatment of Extensive Stage Small Cell Lung Cancer

A Prospective, Single Arm, Phase II Clinical Study of Tislelizumab Combined With Chemotherapy Followed by Thoracic Consolidation Radiotherapy in the First-line Treatment of Extensive Stage Small Cell Lung Cancer

This study is a prospective, single arm, phase II clinical trial. We plan to include 36 newly diagnosed ES-SCLC patients who meet the inclusion criteria and receive induction therapy (tislelizumab+EP regimen, 4-6 cycles). After completing the induction therapy, efficacy evaluation will be conducted. Patients with remission will receive tislelizumab combined with consolidation chest radiotherapy (TRT) sequentially. After the consolidation therapy is completed, they will receive tislelizumab maintenance therapy until disease progression, intolerable toxicity, or withdrawal of informed consent occurs, whichever occurs first. The treatment duration will not exceed 2 years.

Study Overview

• Status: Recruiting
• Conditions: Extensive Stage Small Cell Lung Cancer (ES-SCLC)
• Intervention / Treatment: Drug: Tislelizumab Combined With Chemotherapy

• Study Type: Interventional
• Enrollment (Estimated): 36
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Wei Zhou, Professor; Phone Number: 86-13883465672; Email: 1052308491@qq.com

Study Locations

• China
  • Chongqing Municipality
    • Chongqing, Chongqing Municipality, China, 400000
      • Recruiting
      • Chongqing University Affiliated Cancer Hospital
      • Contact: Wei Zhou, Professor; Phone Number: 86-13883465672; Email: 1052308491@qq.com

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Signed informed consent;
• Age 18-75 years;
• According to the judgment of the investigator, the patient was able to comply with the study protocol;
• Histologically or cytologically confirmed extensive stage small cell lung cancer (es-sclc) (according to the Veterans Administration lung cancer association [valg] staging system);
• No previous systemic treatment for ES-SCLC;
• With measurable lesions assessed by the investigator according to RECIST version 1.1;
• ECOG physical status score was 0 or 1;
• Life expectancy ≥ 3 months;
• Adequate hematology and end organ function, as defined by the following laboratory findings, which should be obtained within 14 days before the first study treatment: absolute neutrophil count (ANC) ≥ 1.5 × 10^9/l (without granulocyte colony-stimulating factor treatment); Lymphocyte count ≥ 0.5 × 10^9/l (500 / μ L); Platelet count ≥ 100 × 10^9/l (100000 / μ L); Hemoglobin ≥ 90g/l (9.0g/dl); Aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) ≤ 2.5 × upper limit of normal (ULN), with the following exceptions: Patients with confirmed liver metastasis: AST and alt ≤ 5 × ULN; Patients with confirmed liver or bone metastasis: ALP ≤ 5 × ULN; Total bilirubin ≤ 1.5 × ULN, with the following exceptions: patients known to have Gilbert syndrome: total bilirubin ≤ 3 × ULN; Creatinine clearance ≥ 60ml/min (calculated by Cockcroft Gault formula); Albumin ≥ 25g/l (2.5g/dl).

Exclusion Criteria:

• Symptomatic, untreated, or actively progressive central nervous system (CNS) metastases; ·Patients with CNS lesions who were treated and asymptomatic were eligible for this study if they met all of the following criteria: measurable lesions that met the recistv1.1 definition were outside the CNS; The patient had no history of intracranial hemorrhage or spinal cord hemorrhage; Patients did not receive stereotactic radiotherapy within 7 days before the start of study treatment, whole brain radiotherapy within 14 days before the start of study treatment, or neurosurgical resection within 28 days before the start of study treatment; Patients do not need to continue to receive corticosteroids for CNS disease. Treatment with stable doses of anticonvulsants was allowed. Metastasis was limited to the cerebellum or supratentorial region (i.e., not to the midbrain, pons, medulla oblongata, or spinal cord); There was no evidence of progression between the completion of CNS local therapy and the initiation of study therapy asymptomatic patients with CNS metastases who could be enrolled according to the assessment of other investigators could be enrolled;
• History of leptomeningeal disease;
• Poorly controlled pleural effusion, pericardial effusion or ascites requiring repeated drainage (once a month or more frequently);
• Poorly controlled or symptomatic hypercalcemia (ionized calcium >1.5mmol/l, calcium >12mg/dl or corrected calcium >uln);
• Have active or ever suffered from autoimmune disease or immunodeficiency;
• Have a history of idiopathic pulmonary fibrosis, organized pneumonia (such as bronchiolitis obliterans), drug-induced pneumonia or idiopathic pneumonia;
• Active pulmonary tuberculosis;
• Untreated chronic hepatitis B patients, chronic hepatitis B virus carriers with HBV DNA ≥ 500 iu/ml (2500 copies /ml), active hepatitis C patients: inactive HBsAg carriers, patients with stable active HBV infection after drug treatment (HBV dna<500 iu/ml (2500 copies /ml)) can be enrolled. HBV DNA testing was only performed in patients who tested positive for hepatitis B core antibody (anti HBC antibody). Patients with negative hepatitis C virus (HCV) antibody test at screening, or patients with positive HCV antibody and negative HCV RNA test at screening can be enrolled in the study. HCV RNA testing will only be performed in patients with positive hepatitis C virus (HCV) antibody. Note: Patients with detectable hepatitis B surface antigen (HBsAg) or detectable HBV DNA should be treated according to treatment guidelines. Patients treated with antiviral drugs at the time of screening should have been treated for >2 weeks before enrollment and continue to be treated for 6 months after termination of study drug treatment.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Experimental group

Drug: Tislelizumab Combined With Chemotherapy; Patients with newly diagnosed ES-SCLC receive induction therapy (tislelizumab+EP regimen, 4-6 cycles). After completing the induction therapy, efficacy evaluation is conducted. Those who experience remission are sequentially treated with tislelizumab combined with consolidation chest radiotherapy (TRT). After the consolidation therapy is completed, tislelizumab maintenance therapy is received until disease progression, intolerable toxicity, or withdrawal of informed consent occurs, whichever occurs first. The maximum duration of treatment is 2 years.; Other Names: thoracic consolidation radiotherapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
progression-free survival	Progression free survival (PFS): defined as the period from enrollment to the date of the first recorded tumor progression (assessed according to RECIST v1.1 criteria, regardless of whether treatment is continued or not) or the date of death from any cause, whichever occurs first, assessed up to 24 months.	From enrollment to the date of the first recorded tumor progression (assessed according to RECIST v1.1 criteria, regardless of whether treatment is continued or not) or the date of death from any cause, whichever occurs first, assessed up to 24 months.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Objective response rate	Defined as the proportion of patients with BOR rated as CR or PR according to RECIST v1.1 criteria from the start of enrollment. If the therapeutic effect reaches CR or PR, the patient must confirm it no less than 4 weeks (28 days) after the initial evaluation, assessed up to 6 weeks (42 days) . The best overall efficacy refers to the best efficacy evaluated by the researcher, which is the best efficacy recorded during the period from the patient's enrollment to the date of objective recording of disease progression according to RECIST v1.1 standards or the date of starting subsequent anti-tumor treatment (whichever occurs first). For patients who have not recorded disease progression or started subsequent anti-tumor treatment, the optimal overall efficacy will be determined based on all efficacy evaluation results.	The proportion of patients with BOR rated as CR or PR according to RECIST v1.1 criteria from the start of enrollment to progressive disease, assessed up to 24 months.
Disease control rate	Defined as the proportion of patients who, from enrollment, have the best overall response (BOR) evaluated according to RECIST v1.1 criteria as complete response (CR), partial response (PR), and disease stability (SD).	The proportion of patients who, from enrollment to progressive disease, assessed up to 24 months
Duration of remission	Defined as the time from the first recorded objective remission to recurrence or death for any reason, as determined by the researcher based on RECIST v1.1, whichever occurs first.	From enrollment to the first recorded objective remission to recurrence or death for any reason, as determined by the researcher based on RECIST v1.1, whichever occurs first, assessed up to 24 months.
Overall survival	Defined as the time between enrollment and death from any cause.	The time between enrollment and death from any cause, assessed up to 24 months.

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
the incidence of treatment-emergent adverse events	Defined as the incidence of treatment-emergent adverse events [safety and tolerability].	Adverse event occurrence from enrollment to completion of patient treatment, assessed up to 24 months.

Collaborators and Investigators

• Sponsor: Chongqing University Cancer Hospital

Publications and helpful links

General Publications

• Chen D, Zou B, Li B, Gao A, Huang W, Shao Q, Meng X, Zhang P, Tang X, Hu X, Zhang Y, Guo J, Zhao C, Yuan J, Li Q, Zhu C, Yu J, Wang L. Adebrelimab plus chemotherapy and sequential thoracic radiotherapy as first-line therapy for extensive-stage small-cell lung cancer (ES-SCLC): a phase II trial. EClinicalMedicine. 2024 Aug 21;75:102795. doi: 10.1016/j.eclinm.2024.102795. eCollection 2024 Sep.

Study record dates

Study Major Dates

• Study Start (Actual): October 10, 2025
• Primary Completion (Estimated): December 31, 2027
• Study Completion (Estimated): July 31, 2028

Study Registration Dates

• First Submitted: September 8, 2025
• First Submitted That Met QC Criteria: February 20, 2026
• First Posted (Actual): February 23, 2026

Study Record Updates

• Last Update Posted (Actual): February 23, 2026
• Last Update Submitted That Met QC Criteria: February 20, 2026
• Last Verified: February 1, 2026

More Information

Terms related to this study

• Keywords: tislelizumab; first-line treatment; Extensive stage small cell lung cancer; thoracic consolidation radiotherapy
• Additional Relevant MeSH Terms: Therapeutics; Drug Therapy
• Other Study ID Numbers: CZLS2025121-A

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