To investigate whether constitutive levels of elements of this pathway may therefore discern responsiveness to IFN treatment, we examined mRNA expression levels of PKCδ, ULK1 and p38 MAPK in peripheral blood or bone marrow mononuclear cells from patients enrolled in the Myeloproliferative Disorders Research Consortium (MPD-RC)-111 study who received PEG-IFN-α2a (Pegasys) (clinical trial #NCT01259817)7 (Supplementary Table 1). The gene discussed is IFNA1; the disease is myeloproliferative disorder.