A Study to Assess the Safety and Preliminary Efficacy of PT-523 in Patients With Advanced Non-Small Cell Lung Cancer (NSCLC)

Inclusion Criteria: Age ≥ 18 years Histologically or cytologically confirmed NSCLC which is stage III or stage IV, or recurrent disease, and failed therapy with a standard first line (Phase I/II) as well as second line chemotherapy regimen (Phase I), or be intolerant of standard chemotherapy. Receipt of one additional prior chemotherapy regimen for neoadjuvant, adjuvant, or neoadjuvant plus adjuvant is allowable. A prior epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TK) antagonist is allowable (Phase II). Asymptomatic or treated brain metastases (including steroids) if last therapy was received > 4 weeks from study entry and is deemed by the investigator to have a low likelihood of rapid deterioration. ECOG performance status 0 - 2. Adequate organ function and bone marrow reserve. Use of appropriate contraceptive method. Signed patient informed consent. Exclusion Criteria: Investigational agents within 30 days prior to Day 1 of study. Known symptomatic or uncontrolled brain metastases. Uncontrolled intercurrent illness. Known human immunodeficiency virus (HIV), hepatitis A, B, C, D and E. Patient has uncontrolled pleural effusions. Patient has received nitrosoureas or mitomycin-C within 6 weeks or other chemotherapy or radiation therapy within 3 weeks before study entry.