Intrathecal Pemetrexed for Recurrent Leptomeningeal Metastases From Non-small Cell Lung Cancer
Leptomeningeal Metastases
About this trial
This is an interventional treatment trial for Leptomeningeal Metastases focused on measuring Leptomeningeal metastasis, Recurrence, Intrathecal chemotherapy, Pemetrexed
Eligibility Criteria
Inclusion Criteria:
- Patients diagnosed as leptomeningeal metastases from non-small cell lung cancer had been received comprehensive treatment, including intrathecal methotrexate and/or cytarabine, central nervous system radiation therapy, systemic chemotherapy as well as tyrosine-kinase inhibitor drugs.
- Patients diagnosed with recurrent leptomeningeal metastases by positive cerebrospinal fluid cytological examination and persist aggravate symptoms for more than 1 week, or increased intracranial pressure (>300 mmH2O).
- No severe abnormal liver and kidney function; WBC≥2500/mm3, Plt≥60000/mm3;
- No other severe chronic diseases;
- No severe dyscrasia.
- Signed informed consent form.
Exclusion Criteria:
- Patients with the clinical manifestation of nervous system failure including severe encephalopathy, grade III-IV white matter lesions confirmed by imaging examination, moderate or severe coma, and glasgow coma score less than 9 points;
- Patients with severe nervous system injury related with treatment, such as chemical meningitis;
- Patients who had accepted systemic chemotherapy within two weeks, or new molecular targeted therapeutic drug less than one months;
- Patients with poor compliance, or for other reasons, the researchers considered unsuitable to participate in this clinical study.
Sites / Locations
- The First Hospital of Jilin University
Arms of the Study
Arm 1
Experimental
Intra-pemetrexed
Patients were treated with intrathecal pemetrexed at dose escalation. The regimen of intrathecal pemetrexed is 10/15/20 mg, plus dexamethasone 5 mg, twice per week for 2 weeks, followed by once per week for 2-4 weeks. Pemetrexed is administrated by intrathecal injection via lumbar puncture. Folic acid 200-400 μg is administered orally once daily, prior to the first intrathecal pemetrexed, until 21 days after the last intrathecal pemetrexed. A single dose of vitamin B12 1000 μg is administered by intramuscular injection before the first intrathecal pemetrexed,once per 3 weeks. To detect the pharmacokinetics of intrathecal pemetrexed, the serum and cerebrospinal fluid samples are collected. These samples would be analyzed by spectrometer for drug concentration.