Chronic myeloproliferative neoplasms and risk of osteoporotic fractures; a nationwide population-based cohort study.

Patients with systemic mastocytosis have an increased risk of osteoporosis, however, the risk of osteoporotic fractures among the classic chronic myeloproliferative neoplasms (CMPN), including essential thrombocythaemia (ET), polycythaemia vera (PV) and chronic myeloid leukaemia (CML), is unknown. We conducted a population-based cohort study to determine the risk of osteoporotic fractures among three cohorts of patients with newly diagnosed ET, PV, and CML. Patients were identified in medical registers including all Danish hospitals during 1980-2010 and were followed until first osteoporotic fracture. Fracture risk was compared to cohorts from the general population matched on age, sex and calendar year. We followed 7595 CMPN patients and 338974 comparison cohort members. We found that the risk of femoral fracture after 5years was consistently higher than the general population, being 301% (95% confidence interval (CI): 220-410), 474% (95%CI: 406-552) and 464% (95%CI: 329-653) among ET, PV, and CML patients respectively. Adjusted hazard ratio for femoral fracture was increased 119-fold (95% CI: 094-151) for ET patients, 182-fold (95% CI: 162-204) for PV patients, and 267-fold (95% CI: 197-362) for CML patients. We conclude that CMPN patients are at higher risk of osteoporotic fractures than the general population.