JAK2 and primary familial polycythemia due to EPO receptor mutation: Somatic variants in JAK2 and SH2B3 genes are the cause for somatic erythrocytosis (OMIM ID: 133100), somatic myelofibrosis (OMIM ID: 254450), and thrombocythemia (OMIM ID: 614521, 187950) (McMullin and Cario, 2016; Amberger et al., 2019).