CFS was associated with an increased risk for non-Hodgkin lymphoma. CFS was also associated (although not after multiple comparison adjustment) with cancers of the pancreas , kidney , breast , and oral cavity and pharynx . Not with brain cancer.
The cytokine (IFN-γ, IL-6, IL-8, IL-10, MIP-1β , MCP-1, and MIP1-α ) responses to mitogenic activators of PBMC isolated from patients with FM were significantly lower than those of healthy individuals, implying that cell-mediated immunity is impaired in FM patients. This research resulted in a diagnostic test for fibromyalgia.