Active clinical trials for "Myelodysplastic-Myeloproliferative Diseases"

RATIONALE: Light-emitting diode (LED) therapy may be able to prevent mucositis of the mouth. PURPOSE: Randomized phase II trial to determine the effectiveness of LED therapy in preventing mucositis of the mouth in children who are receiving chemotherapy with or without radiation therapy before donor bone marrow transplantation.

RATIONALE: Gathering information over time about patients' sense of being a burden on their caregiver, and caregivers' sense of burden on themselves, may help doctors learn more about the desire to die in patients with late-stage cancer. PURPOSE: This clinical trial is studying perceptions of burden in patients with late-stage cancer and their caregivers.

RATIONALE: Collecting and storing samples of blood from patients with cancer to test in the laboratory may help the study of cancer in the future. PURPOSE: This research study is collecting and storing blood samples from patients with cancer.