RATIONALE: Palifermin may help relieve or prevent oral mucositis caused by chemotherapy and radiation therapy in young patients undergoing stem cell transplant. PURPOSE: This randomized phase II trial is studying palifermin to see how well it works compared with a placebo in preventing oral mucositis caused by chemotherapy and/or radiation therapy in young patients undergoing stem cell transplant.

RATIONALE: Drugs used in chemotherapy, such as methotrexate and leucovorin, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Glucarpidase may help return the level of methotrexate in the blood to a safe range. Giving high-dose methotrexate together with glucarpidase and leucovorin may kill more cancer cells. PURPOSE: This phase I/II trial is studying the side effects and best dose of methotrexate when given together with glucarpidase and leucovorin in treating patients with newly diagnosed primary central nervous system lymphoma.

RATIONALE: Everolimus may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. PURPOSE: This phase II trial is studying how well everolimus works in treating older patients with mantle cell lymphoma who received previous first-line or second-line chemotherapy.

RATIONALE: Methadone, morphine, or oxycodone may help relieve pain caused by cancer. It is not yet known whether methadone is more effective than morphine or oxycodone in treating pain in patients with cancer. PURPOSE: This randomized clinical trial is studying methadone to see how well it works compared with morphine or oxycodone in treating pain in patients with cancer.

RATIONALE: Drugs used in chemotherapy, such as cyclophosphamide, doxorubicin, and vincristine, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Colony-stimulating factors, such as pegfilgrastim, may increase the number of immune cells found in bone marrow or peripheral blood and may help the immune system recover from the side effects of chemotherapy. Monoclonal antibodies, such as rituximab, can block cancer growth in different ways. Some find cancer cells and kill them or carry cancer-killing substances to them. Others interfere with the ability of cancer cells to grow and spread. It is not yet known whether combination chemotherapy and pegfilgrastim is more effective when given with or without rituximab in treating non-Hodgkin lymphoma. PURPOSE: This phase II trial is studying the side effects of giving pegfilgrastim and combination chemotherapy together with or without rituximab and to see how well it works in treating older patients with aggressive B-cell non-Hodgkin lymphoma.

The primary objective of this study is to determine safety, tolerability, dose-limiting toxicities and recommended dose of SCH 900105 administered intravenously (IV) to subjects with relapsed or refractory solid tumors or lymphoma.

RATIONALE: A donor peripheral stem cell transplant helps stop the growth of cancer cells. When the healthy stem cells from a donor are infused into the patient they may help the patient's bone marrow make stem cells, red blood cells, white blood cells, and platelets. Once the donated stem cells begin working, the patient's immune system may see the remaining cancer cells as not belonging in the patient's body and destroy them. Giving an infusion of donor T cells may helps stop the patient's immune system from rejecting the donor's stem cells. PURPOSE: This phase I/II trial is studying the side effects and best dose of donor T cells in treating patients with high-risk hematologic cancer who are undergoing donor peripheral blood stem cell transplant.

The first part of the study will determine the highest dose of study drug that can be taken without causing serious side effects in patients with lymphoma. The appropriate dose determined from the first part of the study will be used in the second part of the study to assess disease response in 6 different types of lymphoma patients.

RATIONALE: PEG-interferon alfa-2b may interfere with the growth of cancer cells and slow the growth of mycosis fungoides/Sezary syndrome. Ultraviolet light therapy uses a drug, such as psoralen, that is absorbed by cancer cells. The drug becomes active when it is exposed to ultraviolet light. When the drug is active, cancer cells are killed. Giving PEG-interferon alfa-2b together with ultraviolet light therapy may kill more cancer cell. PURPOSE: This clinical trial is studying the side effects and best dose of PEG-interferon alfa-2b when given together with ultraviolet light therapy in treating patients with stage IB, stage II, stage III, or stage IVA mycosis fungoides/Sezary syndrome.

RATIONALE: Sometimes the cancer may not need treatment until it progresses. In this case, observation may be sufficient. Giving combination chemotherapy together with bortezomib, thalidomide, and rituximab before an autologous peripheral stem cell transplant stops the growth of cancer cells by stopping them from dividing or killing them. Giving colony-stimulating factors, such as G-CSF, helps stem cells move from the bone marrow to the blood so they can be collected and stored. More chemotherapy is then given to prepare the bone marrow for the stem cell transplant. The stem cells are then returned to the patient to replace the blood-forming cells that were destroyed by the chemotherapy. PURPOSE: This observational and phase II trial is studying how well giving combination chemotherapy together with bortezomib, thalidomide, and rituximab followed by two autologous peripheral blood stem cell transplants works in treating patients with Waldenstrom macroglobulinemia.