The Efficacy and Safety of Narlumosbart in Combination With Stereotactic Body Radiation Therapy to Improve the Efficacy of First-line Chemotherapy Combined With Immunotherapy in Patients With Bone Metastases From Advanced Non-small Cell Lung Cancer
Introduction: Immunotherapy in combination with chemotherapy have been recommended as the first-line treatment of driver-negative advanced non-small cell lung cancer (NSCLC), but the efficacy is worse in NSCLC patients with bone metastases due to the immunosuppressive microenvironment. Studies have shown that not only the nuclear factor kappa-B ligand (RANKL) inhibitors but also Stereotactic Body Radiation Therapy (SBRT) play a significant role in improving the tumor immune microenvironment. Therefore, narlumosbart，a monoclonal antibody (mAb) targeting RANKL，in combination with SBRT may have synergistic effects and improve efficacy of immunotherapy and chemotherapy in driver-negative advanced NSCLC patients with bone metastases.
Methods: This single-arm, single-center phase II clinical trial will enroll NSCLC patients with bone metastases who have not received any systemic therapy. Patients will receive narlumosbart and bone target lesion SBRT in combination with first-line treatment immunotherapy and chemotherapy after screening eligible subjects. Narlumosbart, 120mg/time, subcutaneous injection, is administered every 4 weeks. For the treatment of SBRT for bone metastases, the dose of 24Gy/3F is used for spinal metastases, and 30Gy/5F or 35Gy/5F is used for non-spinal lesions. Chemotherapy combined with immune checkpoint inhibitor therapy was used in accordance with the guidelines. The primary endpoint is to assess the objective response rate of NSCLC patients with bone metastases from narlumosbart combined with SBRT and first-line chemotherapy and immunotherapy. The secondary endpoints include progression-free survival, overall survival and safety. Sample size calculation used the Simon Two-Stage method. 9 patients will be enrolled in the first stage. If ≥ 2 patients achieve CR/PR, the second stage of enrollment will be performed. If only 2 patients \< achieve CR/PR, the trial will be terminated. In the second phase, 15 patients will be enrolled. 27 subjects will be enrolled in this project, considering the dropout rate of 10%. Wangjun Yan AND Zhengfei Zhu are the Co-Principal Investigators of this study.
• Signed written informed consent prior to the implementation of any trial-related procedures;
• Age ≥ 18 years old and ≤ 80 years old;
• Histologically or cytologically confirmed stage IV NSCLC (International Association for the Study of Lung Cancer and American Joint Committee on Cancer Classification 9th Edition TNM Lung Cancer Staging);
• Histologically confirmed bone metastasis, which is assessed by the investigator to require local radiotherapy treatment;
• Patients who have not undergone systemic drug therapy for lung cancer (including chemotherapy, targeting, immunotherapy, etc.);
• Adenocarcinoma patients have been confirmed by tumour histology or cytology or haematology that the driver genes (EGFR, ALK, ROS-1) are all negative, and genetic testing is not required for squamous cell carcinoma patients;
• At least 1 evaluable lesion other than bone metastases (refer to RECIST1.1), and lymph nodes can be used as independent measurable lesions;
• Bone metastases other than the lesions to be radiotherapy do not require local treatment (surgery or radiotherapy) intervention after evaluation;
• ECOG score 0-1 points;
• Expected survival time \> 3 months;
• Adequate organ function, subjects need to meet the following laboratory indicators: 1) In the absence of granulocyte colony-stimulating factor in the past 14 days, the absolute neutrophil value (ANC) ≥ 1.5x109/L; 2) In the case of no blood transfusion in the past 14 days, platelet ≥ 100×109/L; 3) In the absence of blood transfusion or erythropoietin in the past 14 days, haemoglobin \> 9g/dL; 4) Total bilirubin ≤ 1.5 times the upper limit of normal (ULN); 5) aspartate aminotransferase (AST) and alanine aminotransferase (ALT) at 2.5 times ULN ≤ (subjects with liver metastases are allowed ALT or AST ≤5×ULN); 6) serum creatinine ≤ 1.5 times ULN and creatinine clearance (calculated by Cockcroft-Gault formula) ≥ 60 ml/min; 7) good coagulation function, defined as international normalized ratio (INR) or prothrombin time (PT) ≤ 1.5 times ULN; 8) Normal thyroid function, defined as thyroid-stimulating hormone (TSH) within normal limits. If the baseline TSH is outside the normal range, subjects with total T3 (or FT3) and FT4 within the normal range can also be enrolled; 9) Cardiac enzyme spectrum within the normal range (if the investigator comprehensively judges that it is not clinically significant, simple laboratory abnormalities are also allowed to enroll); For female subjects of childbearing age, a urine or serum pregnancy test with a negative result should be received within 3 days prior to receiving the first dose of study drug (Cycle 1 Day 1). If the urine pregnancy test cannot be confirmed to be negative, a blood pregnancy test is required. Females of non-childbearing potential are defined as at least 1 year postmenopausal, or have undergone surgical sterilisation or hysterectomy; If there is a risk of conception, all participants, male or female, are required to use contraception with an annual failure rate of less than 1% throughout the treatment period until 120 days after the last dose of study drug (or 180 days after the last dose of study drug).