serplulimab: Serplulimab will be administered by intravenous infusion at a dose of 4.5mg/kg on Day 1 of each 21-day cycle until unacceptable toxicity or loss of clinical benefit as determined by the investigator after an integrated assessment of radiographic and biochemical data, and clinical status.
Cisplatin: Cisplatin will be administered as intravenous infusion at a dose of 75 mg per meter squared (75 mg/m\^2) after completion of serplulimab on Day 1 of each 21-day cycle during the induction phase (Cycles 1-4).
Carboplatin: Carboplatin will be administered as intravenous infusion at a dose of area under the concentration-time curve (AUC) of 5 mg/mL/min on Day 1 of each 21-day cycle during the induction phase (Cycles 1-4).
Etoposide: Etoposide will be administered intravenously at a dose of 100 mg/m\^2 on Days 1, 2 and 3 of each 21-day cycle during the induction phase (Cycles 1-4).
Thoracic radiation therapy (TRT): Participants will receive concurrent low-dose radiotherapy treatment, in once daily fractions, 3 Gy per fraction, to a target dose of 15 Gy in 5 fractions from Day 1-Day 5 in the first cycle, third cycle（ For patients with primary lung lesions (intrathoracic lesions) evaluated as small PR (tumor shrinkage \< 80%)/SD/PD），forth cycle（for subjects evaluated as PD/SD/PR with extrathoracic residual metastases).
Study summary
This is a Phase II, single arm, multicenter study designed to evaluate the safety and efficacy of low-dose radiotherapy (LDRT) concurrent cisplatin/carboplatin plus etoposide with serplulimab in participants who have extensive-stage small cell lung cancer (ES-SCLC) and are chemotherapy-navïe for their extensive-stage disease.
Eligibility
Sex
ALL
Min age
18 Years
Max age
—
Healthy volunteers
No
Main Inclusion Criteria:
1. Histologically or cytologically confirmed ES-SCLC
2. No prior treatment for ES-SCLC
3. Measurable disease, as defined by RECIST v1.1. Previously irradiated lesions can be considered as measurable disease only if progressive disease has been unequivocally documented at that site since radiation.
4. ECOG performance status of 0 or 1
5. Life expectancy \>= 3 months
6. Adequate hematologic and end-organ function
7. For participants receiving therapeutic anticoagulation: stable anticoagulant regimen
8. Negative human immunodeficiency virus (HIV) test at screening
9. Negative hepatitis B surface antigen (HBsAg) test at screening
10. Positive hepatitis B surface antibody (HBsAb) test at screening, or negative HBsAb at screening accompanied by either of the following: Negative total hepatitis B core antibody (HBcAb), or positive total HBcAb test followed by a negative hepatitis B virus (HBV) DNA test. The HBV DNA test will be performed only for participants who have a negative HBsAg test, a negative HBsAb test, and a positive total HBcAb test.
11. Negative hepatitis C virus (HCV) antibody test at screening, or positive HCV antibody test followed by a negative HCV RNA test at screening. The HCV RNA test will be performed only for participants who have a positive HCV antibody test.
12. For women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraception
13. For men: agreement to remain abstinent (refrain from heterosexual intercourse) or use a condom, and agreement to refrain from donating sperm
Main Exclusion Criteria:
1. Symptomatic, untreated, or actively progressing central nervous system (CNS) metastases
2. Participants with pulmonary artery invasion
3. History of leptomeningeal disease
4. Uncontrolled tumor-related pain
5. Uncontrolled pleural effusion, pericardial effusion, or ascites requiring recurrent drainage procedures
6. Uncontrolled or symptomatic hypercalcemia
7. Active or history of autoimmune disease or immune deficiency
8. History of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, or idiopathic pneumonitis, or evidence of active pneumonitis on screening chest computed tomography (CT) scan
9. Active tuberculosis
10. Significant cardiovascular disease within 3 months prior to initiation of study treatment, unstable arrhythmia, or unstable angina
11. History of malignancy other than small cell lung cancer (SCLC) within 5 years prior to screening, with the exception of malignancies with a negligible risk of metastasis or death
Primary outcome measure(s)
Progression-free survival (PFS) — Baseline up to approximately 24 months The time from the date of first dosing of serplulimab to the first appearance of objective disease progression (according to RECIST1.1) or death from any cause (if it occurs before disease progression).
Trial sites (8)
Facility
City
Region
Status
Chongqing University cancer hospital
Chongqing
Chongqing Municipality
Cancer Hospital of Shantou University Medical College
Shantou
Guangdong
Union Hospital, Tongji Medical College, Huazhong University of Science and Technology
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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