Double Dose of Third-generation EGFR-TKI Plus Intrathecal Pemetrexed Versus Double Dose of Third-generation EGFR-TKI in Patients With LM Progression Following the Treatment of Routine Dose of Third-generation EGFR-TKI

Inclusion criteria

• ✓. routine blood examination (no blood transfusion within 14 days, no hematopoietic stimulating factor drugs are corrected state): hemoglobin (Hb) 90g / L; Absolute neutrophil count (ANC) 1.5109 / L; Platelet (PLT) 100109 / L; White blood cell count (WBC) 3.0109 / L;
• ✓. Biochemical examination: alanine transaminotransferase (ALT) and alanine transaminotransferase (AST) 2.5 upper limit of normal (ULN); Serum total bilirubin (TBIL) 1.5 ULN; Serum creatinine (Cr) of 1.5 ULN or creatinine clearance of 50 ml/min; If any liver metastasis, Then, the total bilirubin 3 ULN, ALT and AST 5 ULN; C) Coagulation function: activated partial thromboplastin time (APTT), international normalized ratio (INR), prothrombin time 12 (PT) 1.5 ULN;