Is polycythemia vera a type of cancer?

As below: Polycythemia vera is a type of cancer of the bone marrow where your blood cells (white/red cells, platelets are produced). It is one of the chronic myeloproliferative neoplasms where there is a clonal proliferation of myeloid cells. In PV there is an elevated red blood cell mass (RCM). This can cause high Hct >= 32 in W. Also Platelet count & White blood cell count could be elevated too.