Leptomeningeal metastasis, characterized by tumor cells infiltrating and proliferating in the subarachnoid space, represents a distinct pattern of central nervous system involvement and is a fatal complication of malignant tumors.

This phase I/II study is to evaluate the recommended dose, safety, feasibility, and therapeutic response of intrathecal PD-1/VEGF bispecific antibody plus pemetrexed in patients with leptomeningeal metastasis.

Leptomeningeal metastasis represents a severe complication of advanced malignancies, for which intrathecal chemotherapy remains the mainstay treatment. The preliminary results from our previous study on PD-1 combined with pemetrexed intrathecal administration showed safety and feasibility for leptomeningeal metastasis from solid tumors with potential activity. In recent years, targeted therapy and immunotherapy has been widely used for the treatment of solid tumors. As the world's first PD-1/VEGF bispecific antibody, ivonescimab ((AK112) has shown superior systemic efficacy compared to conventional VEGF targeted therapy combined with immunotherapy, while maintaining a favorable safety profile. The primary objectives are to determine the recommended dose of intrathecal ivonescimab in combination with pemetrexed and to assess safety based on the incidence of treatment-related adverse events. Clinical response rate, progression-free survival related to leptomeningeal metastasis, and overall survival are also evaluated. Patients undergo cerebrospinal fluid and blood specimen collection to evaluate potential clinical, molecular, and/or immune predictors of treatment efficacy and safety.

Inclusion Criteria:

1. Histologically or cytologically confirmed diagnosis of solid tumors;Cerebrospinal fluid cytopathology is positive.
2. Male or female aged between 21 and 75 years; Normal liver and kidney function; WBC≥4000/mm3, Plt≥100000/mm3.
3. No history of severe nervous system disease; No severe dyscrasia.

Exclusion Criteria:

1. Any evidence of nervous system failure, including severe encephalopathy, grade 3 or 4 leukoencephalopathy on imaging, and Glasgow Coma Score less than 11.
2. Any evidence of extensive and lethal progressive systemic diseases without effective treatment.
3. Obvious bleeding tendency; Patients with hemorrhage (NCI-CTCAE v5.0 greater than grade 2), coagulation disorder, hypertensive crisis, and severe arterial thrombosis.
4. A history of HIV or AIDS, acute or chronic hepatitis B or C infection, previous anti-PD1 therapy-induced pneumonitis, or have ongoing >Grade 2 adverse events of such therapy; or ongoing autoimmune disease that required systemic treatment in the past 2 years.
5. The first month to treatment, as well as during induction and consolidation therapy, new drugs effective against leptomeningeal metastases were used, excluding those previously administered. These primarily included small molecule targeted therapies, such as EGFR-TKI/ALK-TKI drugs like Osimertinib and Lorlatinib.
6. Patients with poor compliance or other reasons that were unsuitable for this study.