This is a prospective, single-arm clinical study designed to evaluate the 6-month progression-free survival rate (6-month PFS rate) of a PD-L1 inhibitor combined with apatinib as first-line maintenance treatment for extensive-stage small cell lung cancer (ES-SCLC). The study plans to recruit 40 patients. After receiving 4-6 cycles of induction therapy, patients whose efficacy is evaluated as CR, PR or SD (according to RECIST 1.1) will enter maintenance therapy with PD-L1 inhibitor + apatinib 250 mg po qd. , the selection of PD-L1 inhibitors in the maintenance phase is consistent with the first-line standard treatment in the induction phase. Efficacy was assessed using RECISIT 1.1, with imaging evaluations every 6 weeks (±7 days) for 48 weeks after the first dose and every 9 weeks (±7 days) after week 48, regardless of treatment delays or interruptions, until Disease progression or study termination, whichever occurs first. The primary efficacy endpoint of this study is 6-month PFS rate, and secondary efficacy endpoints include median PFS, median OS and safety.
Aged 18-75 years old, both men and women are welcome;
Extensive-stage small cell lung cancer confirmed by histology or cytology (staging according to the American Veterans Lung Cancer Association, VALG);
Patients whose induction therapy must receive the first-line standard treatment regimen of PD-L1 monoclonal antibody combined with chemotherapy, and whose efficacy evaluation is CR, PR or SD (according to RECIST 1.1); patients who have previously undergone surgical treatment and receive curative adjuvant therapy such as radiotherapy , chemotherapy patients, there is a treatment-free interval of at least 6 months from the last chemotherapy, radiotherapy or chemoradiotherapy to the diagnosis of extensive-stage SCLC;
Expected survival time ≥12 weeks;
Patients transformed from non-small cell carcinoma (NSCLC) to SCLC or SCLC with mixed histology;
Meningeal metastasis or symptomatic central nervous system metastasis; for patients with asymptomatic brain metastasis or stable symptoms for ≥ 2 weeks after treatment of brain metastasis, they can participate in this study as long as they meet all the following criteria: Outside the central nervous system Have measurable lesions, no metastasis to the meninges, midbrain, pons, cerebellum, medulla oblongata or spinal cord, no previous history of intracranial hemorrhage, and stop hormone therapy 14 days before the first dose of study drug;
Third space effusion with clinical symptoms requires repeated drainage, such as pericardial effusion, pleural effusion and peritoneal effusion that cannot be controlled by pumping or other treatments;
Have a history of idiopathic pulmonary fibrosis, organizing pneumonia (such as bronchiolitis obliterans), drug-induced pneumonia, infectious pneumonia, radiation pneumonitis requiring steroid treatment, active tuberculosis, or other serious effects on the lungs Functional moderate to severe lung disease;