Martin Griesshammer, MD, Johannes-Wesling Clinic Minden, Minden, Germany, discusses pregnancy in patients with myeloproliferative neoplasms (MPN) at the 2017 British Society for Haematology (BSH) Annual Scientific Meeting in Brighton, UK. Approximately 700 pregnant patients with essential thrombocytopenia are currently overseen. Approximately 70% of these pregnancies result in live births, with the remaining 30% suffering miscarriages. In pregnant patients with polycythemia vera, there are fewer cases reported, with approximately 77% of pregnancies resulting in live births. A small percentage of these patients suffer thrombosis and major bleeding. As MPNs are rare, and MPNs in pregnancy is even rarer, it is important to collect as much data and information as possible.