Abstract
Encouraged by the benefits of interferon on CML and by the absence of leukemogenic effect on PV, we started using it in the late 1980s. Eight patients with PV were treated with conventional IFN-alpha2b and, although effective to induce remissions with very few vascular events, the side effects and the high cost made its use inconvenient. A 64 years old female patient with PV presented with stroke, was treated with IFN and died in hematologic remission ten years later due to MI. Pegylated interferon proved to be highly effective and was very well tolerated by five patients (three PV, one ET/MF, and one preMF).
These patients were followed up for a period of 6-16 years, a total of 62 years altogether, and never suffered from any vascular event. A female patient with PV in complete molecular remission developed MF after 14 years of treatment. She is currently doing extremely well three years later receiving IFN + Epo. A patient with PV in clinical and hematologic remission developed a rectal carcinoma nine years after starting treatment. One PV patient in remission for five years and another one with ET/MF in remission for six years are on treatment without complications.
An elderly female patient with preMF discontinued IFN after five years due to depression. New agents are being used to improve the conditions of patients with MPN. Ropeginterferon is the only one that can induce complete molecular response in PV and ET. Some other are JAK inhibitors, like ruxolitinib (approved for MF and PV), fedratinib, pacritinib, momelotinib (active in MF against constitutional symptoms, splenomegaly and anemia), Itacitinib.
Some erythopoiesis stimulating agents like luspatercept, sotatercept, roxadustat, can be useful in MF.
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