Component analysis of cytokine levels. Principal component analysis of IFN-α, IL-12, MCP-1, IL-4, and IL-7 production in patients with ECD and healthy controls. Analysis confirms that patients and controls may be distinguished based on a 5-cytokine profile (IFN-α, IL-12, MCP-1, IL-4, and IL-7), as they form 2 separate groups, but that treated and untreated patients are undistinguishable. There were 4 patients projected out of the analysis and thus were not represented for clarity reasons.