In the first study, interferon- (IFN-) gamma-inducible protein-10 (IP-10), monokine induced by IFN-gamma (MIG), macrophage inflammatory protein- (MIP-) 1alpha, MIP-1beta, RANTES, eotaxin, monocyte chemoattractant protein- (MCP-) 1, MCP-2, MCP-3, and Growth-regulated oncogene-alpha (GRO-α) were unchanged in the serum of PV patients [4]. The gene discussed is CXCL9; the disease is acquired polycythemia vera.