Participants may not have a major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to starting cediranib; anticipation of need for major surgical procedures during the course of the study also excludes patients from the trial Major surgical procedure (including open biopsy, significant traumatic injury, etc.) within 28 days, or anticipation of the need for major surgical procedure during the course of the study as well as minor surgical procedure (excluding placement of a vascular access device or bone marrow biopsy) within 7 days prior to study enrollment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to randomization or anticipation of need for a major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 of treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to enrollment, or anticipation of need for major surgical procedure during the course of the study Prior therapy:\r\n* Prior treatment with systemic immunosuppressive treatments, aside from systemic dexamethasone therapy for cerebral edema, such as methotrexate, chloroquine, azathioprine, etc. within 3 months of start of study therapy\r\n* Prior treatment with interstitial brachytherapy within 6 months of start of study therapy\r\n* Previous treatment with programmed death-protein 1 (PD-1) or programmed death-ligand 1 (PD-L1) directed therapy\r\n* Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to first study treatment, or anticipation of need for major surgical procedure during the course of the study\r\n* Minor surgical procedure (eg, stereotactic biopsy within 7 days of first study treatment; placement of a vascular access device within 2 days of first study treatment) Major surgical procedure or significant traumatic injury within 14 days of initiating study drug or anticipation of the need for major surgery during the study Patients may have undergone a major or minor surgical procedure as long as the following apply:\r\n* Major surgical procedure, open biopsy or significant traumatic injury greater than 28 days prior to the first date of study therapy\r\n* Core biopsy or intravenous (IV) port placement greater than 7 days prior to the first date of study therapy Major surgical procedure or significant traumatic injury within 28 days prior to study entry or anticipation of the need for major surgery during the course of study treatment Major surgical procedure or significant traumatic injury within 14 days of initiating study drug or anticipation of the need for major surgery during the study Major surgical procedure (including open biopsy, significant traumatic injury, etc.) within 28 days, or anticipation of the need for major surgical procedure during the course of the study as well as minor surgical procedure (excluding placement of a vascular access device or bone marrow biopsy) within 7 days prior to randomization. Major surgical procedure or significant traumatic injury within 28 days prior to Day 1, Cycle 1, or anticipation of the need for major surgery during study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 30 days prior to Cycle 1, Day 1 or anticipation of need for major surgical procedure during the course of the study Major surgery, open biopsy, significant traumatic injury within 28 days of starting treatment or anticipation of need for major surgical procedure during the course of the study Invasive procedures defined as follows:\r\n* Major surgical procedure or significant traumatic injury within 28 days prior to day 1 therapy, or open biopsy within 7 days prior to day 1 therapy\r\n* Anticipation of need for major surgical procedures during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 or anticipation of need for major surgical procedure during the course of the study Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to first study treatment, or anticipation of need for major surgical procedure during the course of the study. History of a major surgical procedure or a significant traumatic injury within 14 days prior to commencing treatment, or the anticipation of the need for a major surgical procedure during the course of the study. Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to the start of study drug (56 days for hepatectomy, open thoracotomy, major neurosurgery) or anticipation of need for major surgical procedure during the course of the study (except for the planned metastasectomy) Patients with a major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to initiation of therapy, or anticipation of need for major surgical procedure during the course of the study other than that defined by protocol are ineligible Major surgical procedure or significant traumatic injury within 28 days prior to day 1 or anticipation of the need for major surgery during the course of study treatment Patients who have had a major surgical procedure, open biopsy, or significant traumatic injury with poorly healed wound within 6 weeks prior to first dose of study drug; or anticipation of need for major surgical procedure during the course of the study (other than defined by protocol); or fine needle aspirations or core biopsies) within 7 days prior to first dose of study drug. NOTE: Patients will be allowed to start cycle 1 day 1 therapy after 24 hours from pre-treatment biopsy Major surgical procedure with 4 weeks of first dose of study drug; open biopsy, or significant traumatic injury within 7 days prior to enrollment date; anticipation of need for major surgical procedure during the course of the study. (Bevacizumab-related exclusion) Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to study enrollment, or anticipation of need for major surgical procedure during the course of the study. For patients with brain tumors, craniotomy or intracranial biopsy sites must be adequately healed; free of drainage or cellulitis, and the underlying cranioplasty must appear intact at the time of study enrollment Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to on-study date, or anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 14 days prior to first dose of study drug treatment on Study Day 1 of Period A, or anticipation of the need for major surgery during study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 0, anticipation of need for major surgical procedure during the course of the study; as an example, port placement or core biopsies are not considered major surgical procedures Patients who have had a major surgical procedure, open biopsy, or significant traumatic injury with poorly healed wound within 6 weeks prior to first dose of study drug; or anticipation of need for major surgical procedure during the course of the study (other than defined by protocol); or fine needle aspirations or core biopsies within 7 days prior to first dose of study drug Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 0, anticipation of need for major surgical procedure during the course of the study Invasive procedures defined as follows:\r\n* Major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to day 1 therapy\r\n* Anticipation of need for major surgical procedures during the course of the study\r\n* Core biopsy within 7 days prior to day 1 (D1) therapy Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 of FOLFIRI + bevacizumab initiation or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 of study drug (56 days for hepatectomy, open thoracotomy, major neurosurgery) or anticipation of need for major surgical procedure during the course of the study History of a major surgical procedure or a significant traumatic injury within 14 days prior to commencing treatment, or the anticipation of the need for a major surgical procedure during the course of the study. Major surgical procedure (including open biopsy, excluding central line intravenous (IV) and port-a-cath placement) within ? 14 days prior to initiating study treatment, or anticipation of the need for major surgery during the course of the study treatment Major surgical procedure or significant traumatic injury within 28 days before the first dose of study drug or anticipation of the need for major surgery during the course of study treatment. Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to Day 1 or anticipation of need for major surgical procedure during the course of the study Invasive procedures defined as follows:\r\n* Major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to day 1 therapy\r\n* Anticipation of need for major surgical procedures during the course of the study\r\n* Core biopsy within 7 days prior to day 1 therapy Patients who have a major surgical procedure, or significant traumatic injury within 28 days prior to the first date of treatment on this study, or anticipation of need for major surgical procedure during the course of the study; patients with placement of vascular access device or core biopsy within 7 days prior to the first date of treatment on this study Patients with invasive procedures or anticipation of invasive procedures within the following timeframes as defined below:\r\n* Major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to the first date of bevacizumab therapy (cycle 2)\r\n* Major surgical procedure anticipated during the course of the study\r\n* Core biopsy within 7 days prior to the first date of bevacizumab therapy (cycle 2) Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to study enrollment or anticipation of need for major surgical procedure during the course of the study This criterion applies only to the patients enrolled before August 29, 2011 and those enrolled after this date electing to receive bevacizumab; patients who have had a major surgical procedure, open biopsy, dental extractions or other dental surgery/procedure that results in an open wound, or significant traumatic injury within 28 days prior to the first date of treatment on this study, or anticipation of need for major surgical procedure during the course of the study; patients with placement of vascular access device or core biopsy within 7 days prior to the first date of treatment on this study No major surgical procedures, open biopsy or significant traumatic injury =< 28 days prior to registration or anticipation of need for elective or planned major surgical procedure during the study; core biopsy or other minor surgical procedures =< 7 days prior to registration Major surgical procedure or significant traumatic injury within 28 days prior to randomization or anticipation of the need for major surgery during the course of study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 0, or anticipated need for major surgical procedure during the course of the study, or fine needle aspirations or core biopsies within 7 days prior to day 0 Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to Day 1 or anticipation of need for major surgical procedure during course of the study. The subject had a major surgical procedure, substantial open biopsy, or significant traumatic experience within 28 days before the Day 1 visit, or anticipation of need for major surgical procedure during the course of the study. Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to study enrollment, or anticipation of need for major surgical procedure during the course of the study; minor surgical procedures including placement of a vascular access device, within 2 days of the first study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 30 days prior to Cycle 1, Day 1 or anticipation of need for a major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to enrollment date, anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to Day 0, anticipation of need for major surgical procedure during the course of the study; minor surgical procedures such as fine needle aspirations or core biopsies within 7 days prior to Day 0 Major surgical procedure, open biopsy, or significant traumatic injury =< 28 days prior to registration (=< 56 days for hepatectomy, open thoracotomy, major neurosurgery) or anticipation of need for major surgical procedure during the course of the study Patients who have a major surgical procedure, or significant traumatic injury within 28 days prior to the first date of treatment on this study, or anticipation of need for major surgical procedure during the course of the study; patients with placement of vascular access device or core biopsy within 7 days prior to the first date of treatment on this study Patients must not have experienced any major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to registration, or be anticipated to need a major surgical procedure during the course of the study; NOTE: the exception is craniotomy; patients with brain tumors who have undergone craniotomy or intracranial biopsy must be cleared by their neurosurgeon to participate at the time of registration Invasive procedures defined as follows:\r\n* Major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to day 1 therapy\r\n* Brain biopsy within 28 days prior to day 1 of therapy (wounds must be fully healed from brain biopsies performed more than 28 days prior to day 1 of therapy)\r\n* Anticipation of need for major surgical procedures during the course of the study\r\n* Core biopsy within 7 days prior to day 1 of therapy Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day -3 or anticipation of need for major surgical procedure during the course of the study; (a major surgical procedure constitutes an invasive procedure which requires general anesthetic support, hospitalization, and supportive care such as laparotomy, laminectomy, etc.) Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 of treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury other than craniotomy within 28 days prior to Day 1, anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 4 weeks before enrollment or anticipation of need for major surgical procedure during the course of the study; subjects with limited metastatic disease that has been surgically resected may enter and begin study therapy 3 weeks after surgery and the bevacizumab containing portion of the regimen may begin no sooner than 4 weeks after surgery\r\n* If, during the course of the study, a subject progresses on therapy to the point that surgical resection is recommended, the subject should be discontinued from the study but is eligible for re-enrollment into the study after the surgical resection provided all inclusion/exclusion criteria are met Major surgical procedure, open biopsy (excluding skin cancer resection), or significant traumatic injury within 14 days of initiating study drug (unless the wound has healed) or anticipation of the need for major surgery during the study. Major surgical procedure, open biopsy, or significant traumatic injury, within 28 days prior to day 1, anticipation of need for major surgical procedure during the course of the study; (minor surgical procedures, fine needle aspirations or core biopsies within 7 days prior to day 1; bone marrow aspiration +/- biopsy is allowed) Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to Day 1 or anticipation of need for major surgical procedure during course of study Patients may not have had a major surgical procedure, open biopsy (excluding skin cancer resection, cutaneous/subcutaneous melanoma metastasis resection or biopsy or vascular access device insertion), or significant traumatic injury within 28 days prior to Day 1, or have an anticipated need for major surgical procedure or a planned elective surgical procedure during the course of the study. Patients with contraindications to anticoagulation therapy for deep venous thrombosis such as:\r\n* Patients on full treatment dose of anticoagulation such as those patients being treated for pulmonary embolus\r\n* Presence of central nervous system or brain metastases\r\n* Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1\r\n* Anticipation of need for major surgical procedure during the course of the study\r\n* Those patients that develop DVTs during the study will be treated with anticoagulants and in certain cases, will continue on the protocol Major surgical procedure or significant traumatic injury within 28 days prior to day 1 or anticipation of the need for major surgery during the course of study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to the first dose of study treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to randomization, or anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 4 weeks prior to the first dose of study-drug treatment in Cycle 1, or anticipation of the need for major surgery during the course of study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to the first dose of study treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 28 days prior to\n randomization or anticipation of the need for major surgery during the course of\n study treatment Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to enrollment, or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to the first dose of study treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure, open biopsy, or significant traumatic injury or anticipation of need for major surgical procedure during the course of the study; core biopsy or other minor surgical procedure, eg placement of a vascular access device, are excluded from this requirement Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to the first dose of study treatment or anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 28 days before enrollment or anticipation of the need for major surgery during the course of study treatment History of invasive procedures defined as follows: \r\n* Major surgical procedure, open biopsy, or significant traumatic injury =< 28 days prior to registration\r\n* Anticipation of need for major surgical procedures during the study\r\n* Core biopsy =< 7 days prior to registration Major surgical procedures, or significant traumatic injury =< 14 days prior to registration or anticipation of need for elective or planned major surgical procedure during the course of the study Patient who has undergone the following invasive procedures: Major surgical procedure, open biopsy or significant traumatic injury < 14 days prior to starting study drug or has not recovered from side effects of such therapy, anticipation of need for invasive surgical procedure during the course of the study, biopsy within 7 days prior to starting study drug Major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to commencing study treatment, or anticipation of need for a major surgical procedure during the course of the study; A major surgical procedure or significant traumatic injury within 28 days of beginning treatment, or anticipation of the need for major surgery during the course of the study; in addition, if a patient has not yet recovered from prior minor surgery (such as central venous access device or fine needle aspiration biopsy) Patients with or with anticipation of a non-study related invasive procedure defined as followed: major surgical procedure, open biopsy or significant traumatic injury within 28 days prior to the first date of bevacizumab; major non-study related surgical procedure anticipated during the course of the study; core biopsy within 7 days prior to first date of bevacizumab Major surgical procedure or significant traumatic injury within 14 days prior to first dose of study drug or anticipation of the need for major surgery during study treatment No excess risk of bleeding (any of the following):\r\n* Bleeding diathesis or coagulopathy\r\n* Thrombocytopenia\r\n* Major surgical procedure, open biopsy, or significant traumatic injury within the past 28 days or anticipation of need for major surgical procedure during the course of the study\r\n* Minor surgical procedures, stereotactic biopsy, fine needle aspiration, or core biopsy within the past 7 days Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to day 1 or anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 4 weeks prior to initiation of study drug, or anticipation of need for major surgical procedure during the course of the study Has had a major surgical procedure, other than for HNC, or significant traumatic injury within 4 weeks prior to the initiation of RT; anticipation of need for major surgical procedure during the course of the study Major surgical procedure or significant traumatic injury within 4 weeks prior to first dose of study drug treatment in Cycle 1, or anticipation of the need for major surgery during the course of study treatment