Phase I Clinical Study of α-PD-L1/DLL3 CAR-T in Patients With R/R SCLC

Inclusion Criteria: * Patients with recurrent or refractory small cell lung cancer (SCLC) confirmed by histology or cytology who have relapsed or progressed after treatment with one previous platinum-based regimen; * Patients can provide sufficient tumor tissue (fresh or paraffin sections, etc.); * Age 18 \~70 (including boundary), for both men and women; * Eastern Cooperative Oncology Group (ECOG) performance status of 0-1; * Life expectancy ≥3 months; * At least one extracranial measurable lesion (RECIST v1.1) exists；for lesion after radiotherapy， must be confirmed that the lesion has progressed ; * Patients in limited-stage at the initial diagnosis must undergo radical thoracic radiotherapy and the time of tumor progression is not less than 1 months from the end of radiotherapy, or radical thoracic dose radiotherapy cannot be performed for specific reasons; The time elapsed since the completion of radiotherapy for brain metastases shall be no less than 1 months； * The test results of human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg), hepatitis C and syphilis were negative at screening (If hepatitis B core antibody (HBcAb) is positive, additional HBV DNA testing is required, and subjects whose test result is less than the reference value can be included in the study) ; * Female patients or male reproductive age patients and their partners should agree to effective contraception from sighing Informed Consent Form (ICF) to 6 months after the last BHP01 infusion. Exclusion Criteria: * Patients with known primary Central Nervous System (CNS) tumor, or meningeal metastasis, or patients with unstable CNS metastasis (symptomatic, requiring hormonal therapy within 4 weeks before investigational treatment, or no radiographic evidence of stabilization of the lesion for more than 4 weeks); * Received major surgical procedures （except for diagnosis） within 4 weeks before PBMCs collection, or are expected to require major surgical procedures during the study; * Received Chinese herbal medicine or Chinese patent medicine for anti-tumor indications within 7 days before Peripheral Blood Mononuclear Cells (PBMCs) collection; * Patients with a history of idiopathic pulmonary fibrosis, mechanical pneumonia (such as bronchiolitis obliterans), drug-induced pneumonia or idiopathic pneumonia, or evidence of active pneumonia by chest computer tomography (CT) at screening \[a history of radiation pneumonia (fibrosis) in the irradiated field may participate in this study\]; * Poorly controlled pleural effusion, pericardial effusion, or ascites requiring repeated drainage procedures (once a month or more frequently); * Poorly controlled or symptomatic hypercalcemia (ionic calcium\> 1.5 mmol/L, calcium\> 12 mg/dL or corrected calcium\> ULN); * Presence of active or previous autoimmune diseases or immunodeficiencies, including but not limited to myasthenia gravis, myositis, autoimmune hepatitis, systemic lupus erythematosus, rheumatoid arthritis, etc.; * Severe infection within 4 weeks before the start of PBMCs collection, including but not limited to hospitalization due to infection, bacteremia, severe pneumonia, or any active infection that may affect the patient's safety; * Serious cardiovascular and cerebrovascular diseases (such as heart disease ≥New York Heart Association class II, myocardial infarction or cerebrovascular accident), unstable arrhythmia or unstable angina pectoris within 3 months before PBMCs collection; * Previous treatment with DLL 3 target drugs or CAR-T or other gene-modified T cells; * Received any other Investigational drug within 28 days prior to PBMCs collection; * A history of mental illness; * Incapacitated persons or persons with limited capacity; * pregnant or lactating females; Males or females who are unwilling to use adequate contraception; Females of childbearing potential are required to undergo a pregnancy study during the screening period;