The Study of Gemcitabine in the Maintenance Treatment of Advanced Non-small Cell Lung Cancer

Inclusion Criteria

• •18\~75 years Patients who were diagnosed by the histologic, cytologic diagnosis of IIIb-IV non-small cell lung cancer patients who have acceptted combination chemotherapy based on platinum 4 course,SD OR PR,the CR patients should accept 6 course of combination chemotherapy.
• •3\~8 weeks after patients complete first line chemotherapy(include radiotherapy) Ecog0-2 Expected life time longer than 3 monthes
• •Normal laboratory values:
• •leucocyte ≥ 4×109/L
• •neutrophil ≥ 1.5×109/L
• •platelet ≥ 100×109/L
• •Hemoglobin ≥ 10g/L
• •ALT and
• •AST ≤ 2.5×ULN (≤ 5×ULN if liver metastasis) Signed written informed consent