A Study of Pemetrexed and Carboplatin/Cisplatin or Gemcitabine and Carboplatin/Cisplatin With or Without IMC-1121B in Participants Previously Untreated With Recurrent or Advanced Non-Small Cell Lung Cancer (NSCLC)

Inclusion Criteria:

* Confirmed NSCLC
* Stage IV disease at the time of study entry
* Measurable disease at the time of study entry
* Resolution to Grade ≤ 1 Adverse Events, of all clinically significant toxic effects of prior chemotherapy, surgery, radiotherapy, or hormonal therapy (except alopecia)
* Adequate hematologic function, hepatic function, renal function and coagulation function
* If sexually active, must be post-menopausal, surgically sterile, or using effective contraception; and agrees to use adequate contraception during the study period and for up to 6 months after the last dose of study medication
* Female participants of childbearing potential must have a negative serum pregnancy test

Exclusion Criteria:

* Has cirrhosis at a level of Child-Pugh B (or worse), or cirrhosis and a history of hepatic encephalopathy, or ascites resulting from cirrhosis and requiring ongoing treatment with diuretics and/or paracentesis
* Tumor wholly or partially contains small cell lung cancer
* Untreated central nervous system (CNS) metastases, eligible if they are clinically stable with regard to neurologic function, off all steroids after cranial irradiation at least 2 weeks prior or after surgical resection performed at least 4 weeks prior to randomization
* Concurrent active malignancy other than adequately treated basal cell carcinoma of the skin or pre-invasive carcinoma of the cervix. A participant with previous history of malignancy other than NSCLC is eligible, provided that he/she has been free of disease for ≥ 3 years
* Received prior therapy with monoclonal antibodies, signal transduction inhibitors, or any therapies targeting the vascular endothelial growth factor (VEGF) or vascular endothelial growth factor receptor (VEGFR)
* Receiving concurrent treatment with other anticancer therapy
* Has received previous chemotherapy for Stage IV NSCLC (participants who have received adjuvant chemotherapy are eligible if the last administration of the prior adjuvant regimen occurred at least 6 months prior to randomization)
* Has radiologically documented evidence of major blood vessel invasion or encasement by cancer
* Has undergone chest irradiation within 12 weeks prior to randomization (except palliative irradiation of bone lesions)
* Ongoing or active infection
* History of significant neurological or psychiatric disorders
* Experienced clinically relevant coronary artery disease, myocardial infarction within 6 months prior to randomization, uncontrolled congestive heart failure, or symptomatic poorly controlled arrhythmia
* Poorly-controlled hypertension
* Experienced any serious Grade 3-4 gastrointestinal bleeding within 3 months prior to study entry
* Receiving chronic daily treatment with aspirin (\> 325 mg/day) or other known inhibitors of platelet function
* Serious nonhealing wound, ulcer, or bone fracture within 28 days prior to randomization
* Major surgery within 28 days prior the first dose of study medication, or subcutaneous venous access device placement within 7 days prior to randomization
* Elective or a planned major surgery
* Pregnant or lactating
* Any other serious uncontrolled medical disorders or psychological conditions
* Allergy / history of hypersensitivity reaction to any of the treatment components
* History of drug abuse