Study of Camtobell Inj (Belotecan) on Weekly Schedule in Non-small Cell Lung Cancer (NSCLC) Patients Previously Treated With Chemotherapy

Inclusion Criteria: * 19 Years and older * Histologically or cytologically confirmed locally advanced or metastatic NSCLC(Stage IIIB or IV) * ≥ one measureable or evaluable lesion, \<25% of the bone marrow had been irradiated * prior platinum based chemotherapy * ECOG PS ≤ 2 * Life expectancy \> 3 months * Adequate organ function: * hematology: ANC ≥ 1.5×109/L, Platelet ≥ 100×109/L, hemoglobin ≥ 9.0g/dL * hepatic: total bilirubin ≤ 1.5×ULN, AST/ALT ≤ 2.0×ULN, ALP ≤2.0×ULN * renal: serum creatinine ≤ 1.5×ULN * Signed a written informed consent Exclusion Criteria: * Active infection * Symptomatic brain lesion * Any other type of cancer during the previous 5 years except appropriately treated basal cell carcinoma of the skin or in situ carcinoma of the cervix * Severe concurrent diseases * Prior anticancer therapy within 4 weeks before enroll * Active pregnancy test