A New Blood Score for Myelofibrosis Staging

Development of a Blood Score for Myelofibrosis Staging in BCR:ABL1 Negative Myeloproliferative Neoplasms Using Bone Marrow Biopsy as a Gold Standard

BCR:ABL1 negative myeloproliferative neoplasms (MPN) include three entities: polycythemia vera, essential thrombocythemia and primitive myelofibrosis. Myelofibrosis is a life-threatening complication in MPN with several therapeutic options including hematopoietic stem cell transplantation (HSCT) which remains the only curative treatment. Bone marrow biopsy with histological analysis allows myelofibrosis identification and staging. However, it is an invasive procedure that remains painful and provides potential haemorrhagic complications. Development of non-invasive biomarkers for myelofibrosis staging could help to better stratify this disease, better define patients' prognosis and lead to optimal cares.

The main aim of this work is to develop a non-invasive blood score including several biomarkers for myelofibrosis staging in MPN using bone marrow biopsy as a gold standard.

Inclusion Criteria:

• Age > 18 years
• Diagnosis of BCR::ABL1 negative MPN according to WHO criteria classification
• Indication for bone marrow biopsy
• Non opposition
• Social security affiliation

Exclusion Criteria:

• Non-contributory biopsy
• AML transformation
• Organ fibrosis (liver, lung, kidney…)
• HSCT
• Chronic inflammatory disease