Clinical Trials

23 trials
RecentStart dateEnrollment
Phase 3 × Completed × Leukemia, Myelomonocytic, Chronic × Clear all
NCT00006083 2020-08-03

Dalteparin to Prevent Complications in Cancer Patients Receiving Chemotherapy Through a Catheter

Jonsson Comprehensive Cancer Center

Phase 3 Completed
DermatologicGynecologicLymphoidMyeloidOther hematologic neoplasmOther neoplasmPlasma cell

Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Uterine Cervical Neoplasms, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Myelodysplastic Syndromes, Myeloproliferative Disorders, Precancerous Conditions, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Primary Myelofibrosis

NCT00750009 2020-07-27

Personalized Information or Basic Information in Helping Patients Make Decisions About Participating in a Clinical Trial

Case Comprehensive Cancer Center

Phase 3 Completed
583 enrolled
CNSDermatologicLymphoidMyeloidOther hematologic neoplasmPlasma cellSarcoma

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Leukemia, Mast-Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Lymphoproliferative Disorders, Waldenstrom Macroglobulinemia, Multiple Myeloma, Mycosis Fungoides, Myelodysplastic Syndromes, Myeloproliferative Disorders, Polycythemia Vera, Recurrence, Sezary Syndrome, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Central Nervous System Neoplasms, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Lymphoma, Extranodal NK-T-Cell, Leukemia, Myelomonocytic, Juvenile, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Dendritic Cell Sarcoma, Interdigitating, Primary Myelofibrosis, Intraocular Lymphoma

NCT00003687 2020-04-03

Treatment for Chronic Pain in Patients With Advanced Cancer

Canadian Cancer Trials Group

Phase 3 Completed
87 enrolled
DermatologicLymphoidMyeloidOther hematologic neoplasmOther neoplasmPlasma cell

Pdgfra-Associated Chronic Eosinophilic Leukemia, Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Waldenstrom Macroglobulinemia, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Myelodysplastic Syndromes, Myeloproliferative Disorders, Pain, Polycythemia Vera, Precancerous Conditions, Sezary Syndrome, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Primary Myelofibrosis

NCT01305200 2019-09-17

Supersaturated Calcium Phosphate Rinse in Preventing Oral Mucositis in Young Patients Undergoing Autologous or Donor Stem Cell Transplant

Children's Oncology Group

Phase 3 Completed
226 enrolled 21 charts
GenitourinaryLymphoidMyeloidOtherOther hematologic neoplasmSarcoma

Pdgfra-Associated Chronic Eosinophilic Leukemia, Burkitt Lymphoma, Myeloproliferative Disorders, Wilms Tumor, Recurrence, Testicular Neoplasms, Leukemia, Neutrophilic, Chronic, Leukemia, Myelomonocytic, Chronic, Mucositis, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Leukemia, Myelomonocytic, Juvenile, Dendritic Cell Sarcoma, Interdigitating

NCT00755040 2017-03-07

Cyclosporine Eye Drops in Preventing Graft-Versus-Host Disease of the Eye in Patients Who Have Undergone Donor Stem Cell Transplant for Hematologic Cancer or Bone Marrow Failure Disorder

Vanderbilt-Ingram Cancer Center

Phase 3 Completed
164 enrolled 8 charts
LymphoidMyeloidOther hematologic neoplasmPlasma cell

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Blast Crisis, Burkitt Lymphoma, Graft vs Host Disease, Hodgkin Disease, Leukemia, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Multiple Myeloma, Myelodysplastic Syndromes, Myeloproliferative Disorders, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Primary Myelofibrosis

NCT00719563 2017-02-09

American Ginseng in Treating Patients With Fatigue Caused by Cancer

Alliance for Clinical Trials in Oncology

Phase 3 Completed
364 enrolled 29 charts
DermatologicLymphoidMyeloidOther hematologic neoplasmOther neoplasmPlasma cell

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Fatigue, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Leukemia, Mast-Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Lymphoproliferative Disorders, Waldenstrom Macroglobulinemia, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Myelodysplastic Syndromes, Myeloproliferative Disorders, Polycythemia Vera, Precancerous Conditions, Sezary Syndrome, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Lymphoma, Extranodal NK-T-Cell, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Primary Myelofibrosis, Intraocular Lymphoma

NCT00006348 2016-07-06

Ondansetron in Treating Patients With Advanced Cancer and Chronic Nausea and Vomiting Not Caused by Cancer Treatment

Alliance for Clinical Trials in Oncology

Phase 3 Completed
100 enrolled
DermatologicLymphoidMyeloidOther hematologic neoplasmOther neoplasmPlasma cellSarcoma

Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Waldenstrom Macroglobulinemia, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Myelodysplastic Syndromes, Myeloproliferative Disorders, Nausea, Polycythemia Vera, Precancerous Conditions, Recurrence, Sezary Syndrome, Thrombocythemia, Essential, Vomiting, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Dendritic Cell Sarcoma, Interdigitating, Primary Myelofibrosis, Intraocular Lymphoma

NCT00538850 2014-03-05

Fentanyl Sublingual Spray in Treating Patients With Breakthrough Cancer Pain

INSYS Therapeutics Inc

Phase 3 Completed
130 enrolled 9 charts
BreastCNSDermatologicEndocrineGastrointestinalGenitourinaryGynecologicHead & NeckLymphoidMyeloidOther hematologic neoplasmOther solid neoplasmPlasma cellSarcomaThoracic

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Breast Carcinoma In Situ, Immunoglobulin Light-chain Amyloidosis, Squamous Cell Carcinoma of Head and Neck, Carcinoma, Ovarian Epithelial, Mesothelioma, Malignant, Anus Neoplasms, Appendiceal Neoplasms, Astrocytoma, Bile Duct Neoplasms, Urinary Bladder Neoplasms, Blast Crisis, Brain Neoplasms, Breast Neoplasms, Burkitt Lymphoma, Carcinoma, Non-Small-Cell Lung, Carcinoma, Renal Cell, Uterine Cervical Neoplasms, Chondrosarcoma, Colonic Neoplasms, Craniopharyngioma, Vipoma, Ependymoma, Esophageal Neoplasms, Fallopian Tube Neoplasms, Gallbladder Neoplasms, Glioblastoma, Glioma, Glucagonoma, Carcinoma, Hepatocellular, Hodgkin Disease, Immunoblastic Lymphadenopathy, Insulinoma, Leukemia, Hairy Cell, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Waldenstrom Macroglobulinemia, Medulloblastoma, Melanoma, Meningioma, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Myeloproliferative Disorders, Neoplasms, Oligodendroglioma, Pain, Pancreatic Neoplasms, Penile Neoplasms, Pinealoma, Polycythemia Vera, Prostatic Neoplasms, Rectal Neoplasms, Salivary Gland Neoplasms, Sarcoma, Osteosarcoma, Sezary Syndrome, Somatostatinoma, Stomach Neoplasms, Testicular Neoplasms, Thrombocythemia, Essential, Thymoma, Urethral Neoplasms, Vaginal Neoplasms, Vulvar Neoplasms, Gastrinoma, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Choroid Plexus Neoplasms, Endometrial Neoplasms, Lymphoma, Large-Cell, Anaplastic, Nephroma, Mesoblastic, Desmoid Tumors, Neuroectodermal Tumors, Primitive, Peripheral, Neuroectodermal Tumors, Primitive, Adrenocortical Carcinoma, Carcinoma, Islet Cell, Esthesioneuroblastoma, Olfactory, Glioma, Subependymal, Gliosarcoma, Lymphoma, B-Cell, Marginal Zone, Breast Neoplasms, Male, Lymphoma, Mantle-Cell, Gastrointestinal Stromal Tumors, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Primary Myelofibrosis, Small Cell Lung Carcinoma, Intraocular Lymphoma

NCT00005823 2013-12-18

Intensive Compared With Nonintensive Chemotherapy in Treating Older Patients With Acute Myeloid Leukemia or Myelodysplastic Syndrome

National Cancer Institute (NCI)

Phase 3 Completed
2,000 enrolled
Classical hematologyMyeloidOther hematologic neoplasm

Congenital Abnormalities, Anemia, Refractory, with Excess of Blasts, Leukemia, Erythroblastic, Acute, Leukemia, Leukemia, Megakaryoblastic, Acute, Leukemia, Monocytic, Acute, Myelodysplastic Syndromes, Myeloproliferative Disorders, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Leukemia, Myelomonocytic, Acute, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative

NCT00003593 2013-06-27

Chemotherapy in Treating Children With Down Syndrome and Myeloproliferative Disorder, Acute Myelogenous Leukemia, or Myelodysplastic Syndrome

Children's Oncology Group

Phase 3 Completed
254 enrolled
Classical hematologyMyeloidOther hematologic neoplasm

Anemia, Refractory, Anemia, Refractory, with Excess of Blasts, Leukemia, Myelodysplastic Syndromes, Myeloproliferative Disorders, Leukemia, Myelomonocytic, Chronic, Leukemia, Myelomonocytic, Juvenile, Myelodysplastic-Myeloproliferative Diseases

NCT00003938 2012-09-24

Liposomal Amphotericin B in Treating Granulocytopenia and Persistent Unexplained Fever in Cancer Patients

European Organisation for Research and Treatment of Cancer - EORTC

Phase 3 Completed
115 enrolled
BreastCNSDermatologicGenitourinaryGynecologicLymphoidMyeloidOther hematologic neoplasmPlasma cellSarcoma

Teratoma, Testicular, Pdgfra-Associated Chronic Eosinophilic Leukemia, Immunoglobulin Light-chain Amyloidosis, Carcinoma, Ovarian Epithelial, Blast Crisis, Breast Neoplasms, Burkitt Lymphoma, Fever, Hodgkin Disease, Immunoblastic Lymphadenopathy, Infections, Leukemia, Hairy Cell, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Waldenstrom Macroglobulinemia, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Neoplasms, Wilms Tumor, Neuroblastoma, Neutropenia, Polycythemia Vera, Recurrence, Sezary Syndrome, Teratoma, Testicular Neoplasms, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, Large-Cell, Anaplastic, Carcinoma, Embryonal, Seminoma, Endodermal Sinus Tumor, Lymphoma, B-Cell, Marginal Zone, Hot Flashes, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Dendritic Cell Sarcoma, Interdigitating, Primary Myelofibrosis, Intraocular Lymphoma

NCT00666211 2012-09-06

Opioid Titration Order Sheet or Standard Care in Treating Patients With Cancer Pain

Vanderbilt-Ingram Cancer Center

Phase 3 Completed
98 enrolled 14 charts
CNSDermatologicLymphoidMyeloidOther hematologic neoplasmOther neoplasmPlasma cell

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Immunoglobulin Light-chain Amyloidosis, Blast Crisis, Burkitt Lymphoma, Hodgkin Disease, Immunoblastic Lymphadenopathy, Leukemia, Leukemia, Hairy Cell, Leukemia, Mast-Cell, Lymphoma, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Lymphoproliferative Disorders, Waldenstrom Macroglobulinemia, Monoclonal Gammopathy of Undetermined Significance, Multiple Myeloma, Mycosis Fungoides, Myelodysplastic Syndromes, Myeloproliferative Disorders, Pain, Polycythemia Vera, Precancerous Conditions, Sezary Syndrome, Thrombocythemia, Essential, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Biphenotypic, Acute, Leukemia, Prolymphocytic, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Central Nervous System Neoplasms, Lymphoma, Large-Cell, Anaplastic, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Leukemia, Large Granular Lymphocytic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Precursor T-Cell Lymphoblastic Leukemia-Lymphoma, Neoplasms, Plasma Cell, Lymphoma, Extranodal NK-T-Cell, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Primary Myelofibrosis, Intraocular Lymphoma

NCT00799461 2012-03-07

Internet-Based Program With or Without Telephone-Based Problem-Solving Training in Helping Long-Term Survivors of Hematopoietic Stem Cell Transplant Cope With Late Complications

Fred Hutchinson Cancer Center

Phase 3 Completed
1,337 enrolled
DermatologicLymphoidMyeloidOther hematologic neoplasmPlasma cell

Pdgfra-Associated Chronic Eosinophilic Leukemia, Congenital Abnormalities, Blast Crisis, Burkitt Lymphoma, Depression, Fatigue, Hodgkin Disease, Leukemia, Hairy Cell, Lymphoma, Follicular, Lymphoma, Non-Hodgkin, Multiple Myeloma, Myeloproliferative Disorders, Leukemia, Lymphocytic, Chronic, B-Cell, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Neutrophilic, Chronic, Leukemia, Myeloid, Acute, Leukemia, Myelomonocytic, Chronic, Lymphoma, Large-Cell, Immunoblastic, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Cutaneous, Lymphoma, B-Cell, Marginal Zone, Lymphoma, Mantle-Cell, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Primary Myelofibrosis

NCT00782145 2011-07-13

A Web-Based Stem Cell Transplant Support System or Standard Care in Young Patients Undergoing Stem Cell Transplant and Their Families

Tufts Medical Center

Phase 3 Completed
198 enrolled
CNSGynecologicLymphoidMyeloidOther hematologic neoplasmSarcoma

Blast Crisis, Burkitt Lymphoma, Leukemia, Lymphoma, Myelodysplastic Syndromes, Myeloproliferative Disorders, Neuroblastoma, Ovarian Neoplasms, Recurrence, Sarcoma, Leukemia, Myeloid, Accelerated Phase, Leukemia, Myeloid, Chronic-Phase, Leukemia, Myelomonocytic, Chronic, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Leukemia, Myelomonocytic, Juvenile, Myelodysplastic-Myeloproliferative Diseases, Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative, Dendritic Cell Sarcoma, Interdigitating, Primary Myelofibrosis