Ketamine Completed Phase 3 Trials for Neurologic toxicity / Chronic Myeloproliferative Disorders / Unspecified Adult Solid Tumor, Protocol Specific / Myelodysplastic/Myeloproliferative Neoplasms / Multiple Myeloma and Plasma Cell Neoplasm / Leukemias / Pain / Disorders, Lymphoproliferative / Myelodysplastic Syndromes (MDS) / Malignant Lymphomas Supportive Care