PTK787 in Refractory or Relapsed Diffuse Large Cell Lymphoma

Inclusion Criteria: * Histologically confirmed DLCL (de novo or transformed). * Measurable/evaluable disease by radiographs, physical exam or bone marrow involvement. * Refractory disease, induction chemotherapy failure or relapsed disease. * Age ≥ 18 years old * Performance Status:KPS ≥ 70 * Laboratory tests as specified by the protocol. * Written informed consent Exclusion Criteria: * History of known central nervous system disease (i.e., primary brain tumor, malignant seizures, CNS metastases or carcinomatous meningitis). * History of another primary malignancy ≤ 5 years, with the exception of inactive basal or squamous cell carcinoma of the skin * Prior chemotherapy ≤ 3 weeks prior to registration. There is no limit to the number of prior chemotherapy regimens. * Prior allogeneic transplant if \>2.5% donor cells remain by engraftment studies (prior autologous transplant is allowed) * Prior biologic or immunotherapy ≤ 2 weeks prior to registration. * Prior full field (total organ site) radiotherapy ≤ 4 weeks or limited field radiotherapy ≤ 2 weeks prior to registration. * Major surgery (i.e., laparotomy) ≤ 4 weeks prior to registration. Minor surgery ≤ 2 weeks prior to registration. * Patients who have received investigational drugs ≤ 4 weeks prior to registration and/or registration * Prior therapy with anti-VEGF targeted agents * Pleural effusion or ascites that causes respiratory compromise (≥ CTC grade 2 dyspnea) * QTc \> 450 (male) or \> 470 (female). Patients with congenital or acquired prolonged QTc syndrome * Female patients who are pregnant or breast feeding, or adults of reproductive potential not employing an effective method of birth control. * Any of the following concurrent severe and/or uncontrolled medical conditions which could compromise participation in the study: * Uncontrolled high blood pressure, history of labile hypertension, or history of poor compliance with an antihypertensive regimen * Unstable angina pectoris * Symptomatic congestive heart failure * Myocardial infarction ≤ 6 months prior to registration * Serious uncontrolled cardiac arrhythmia * Uncontrolled diabetes * Severe active or uncontrolled infection * Interstitial pneumonia or extensive and symptomatic interstitial fibrosis of the lung * Chronic renal disease with documented nephritic or nephrotic syndrome. * Acute or chronic liver disease * Impairment of gastrointestinal (GI) function or GI disease that may significantly alter the absorption of PTK787/ZK222584 * Patients with confirmed diagnosis of human immunodeficiency virus (HIV) infection are excluded at the investigator's discretion if he/she feels that 1) a potential drug interaction between PTK787/ZK 222584 and anti-HIV medications that could influence the efficacy of the anti-HIV medication, or 2) it may place the patient at risk due to the pharmacologic activity of PTK787/ZK 222584. * Patients who are taking therapeutic warfarin sodium (Coumadin) or similar oral anticoagulants that are metabolized by the cytochrome P450 system. * Patients unwilling to or unable to comply with the protocol * Other severe acute or chronic medical or psychiatric condition, or laboratory abnormality that may increase the risk associated with study participation or study drug administration or may interfere with the interpretation of study results and in the judgment of the investigator would make the patient inappropriate for entry into this study.