Myeloproliferative Neoplasms Download PDF, 1.02MB, PDF Myeloproliferative Neoplasms (MPNs) are a group of blood cancers that cause an increase in the number of blood cells. Many people with MPNs feel well and only need to be treated with oral drugs. The disorder often develops and progresses slowly. Find out about the different types of MPNs, whether you may be at risk, symptoms of MPNs, diagnosis and treatment options for MPNs. [Please download the PDF file if you are unable to view the image below.]