IL13 and radiculopathy: Similar to our results, Jönsson et al. found downregulated levels of chemokines and cytokines CTACK and IL-13 in CSF of patients with neuropathic pain compared with controls.6 Conversely, increased CSF cytokines have been found in patients with radiculopathy and injury of a nerve root by the same group.2 However, in the latter study, the authors used an essay that measured only proteins, whereas our essay measured transcription and proteins.