To determine the efficacy of ABT-751 when administered in combination with standard pemetrexed in subjects with advanced or metastatic NSCLC. The Phase 1 portion of the study is complete and the study is currently enrolling subjects in Phase 2.

Inclusion Criteria:

• Pathologically documented NSCLC
• Locally advanced (Stage III) or metastatic (Stage IV) NSCLC
• Only one prior anti-tumor treatment regimen in the non-curative setting (i.e., 2nd-line therapy)
• Only one prior anti-tumor treatment regimen in the curative setting
• Progressive disease following the previous anti-tumor treatment regimen
• Measurable disease by RECIST criteria
• Brain metastasis must be stable and well-controlled
• ECOG performance score 0-2
• All anti-tumor therapy discontinued at least 3 weeks prior to study entry
• All adverse events from prior treatment are resolved or stable
• Adequate hematologic, renal, and hepatic function
• Females must not be pregnant
• Willing to take adequate measures to prevent pregnancy
• Life expectancy of at least 3 months
• Able to complete the Quality of Life questionnaire
• Voluntarily signed informed consent

Exclusion Criteria:

• Greater than Grade 1 neurological findings
• Allergy to sulfa medications
• Previous treatment with ABT-751 or pemetrexed
• Receipt of more than one investigational agent for NSCLC
• Significant weight loss (>10%) within 6 weeks of study entry
• Glucose-6-phosphate dehydrogenase deficiency or porphyria
• Significant systemic disease that would adversely affect participation
• Class 3-4 New York Heart Association classification status
• Other cancers except in situ carcinoma of the cervix, basal or squamous cell skin cancer, or any other cancer considered adequately treated and cured by the investigator